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<v Speaker 1>Welcome to the deep Dive. Today, we're gonna be talking

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<v Speaker 1>all about prepping for the Red Hat Certified System Administrator Exam.

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<v Speaker 1>You know, it's better known as the RHCSA. We've got

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<v Speaker 1>excerpts from a really popular r CSA steady guide and

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<v Speaker 1>we're basically breaking it all down, you know, all the

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<v Speaker 1>key knowledge and practical tips you need to kickstart your

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<v Speaker 1>rh CSA journey.

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<v Speaker 2>Yeah, exactly. Think of this as like us distilling the

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<v Speaker 2>essential information so you can, you know, really hit the

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<v Speaker 2>ground running.

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<v Speaker 1>All right, So let's dive right in. First up, who

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<v Speaker 1>wrote this guide and like what makes it so special?

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<v Speaker 2>Well, the author? The author is Asgar Gory, a true

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<v Speaker 2>veteran in the Linux and cloud world. He's a consultant,

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<v Speaker 2>a trainer, and an author with like eight books on

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<v Speaker 2>Linux and Unix under his belt, so you know, you know,

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<v Speaker 2>he's got the expertise this book. This book isn't just

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<v Speaker 2>an exam grammer. It's designed for you know, in class training,

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<v Speaker 2>on the job, reference, and even as a guide for

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<v Speaker 2>those just starting out with Linux administration. It's it's pretty versatile, Okay.

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<v Speaker 1>So it's a comprehensive guide that covers a lot of

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<v Speaker 1>ground speaking of covering, what's the financial investment for the

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<v Speaker 1>RCSA exam itself.

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<v Speaker 2>Well, the exam fee is it's four hundred dollars plus

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<v Speaker 2>any applicable taxes. You can think of it as an investment,

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<v Speaker 2>an investment in your future assistedmen career. And you can

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<v Speaker 2>register for the exam on red Hat's website and we'll

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<v Speaker 2>be sure to include that link in the show notes.

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<v Speaker 1>Got it, four hundred dollars, we'll get you that link. Now,

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<v Speaker 1>what about the format? Is it multiple choice essays or

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<v Speaker 1>something else? Completely?

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<v Speaker 2>It's all about action. The RHCSA exam is it's hands

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<v Speaker 2>on and practical. You'll have two and a half hours

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<v Speaker 2>to prove your skills by completing a series of real

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<v Speaker 2>world tasks, So you'll need to be able to walk

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<v Speaker 2>the walk, not just talk the talk.

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<v Speaker 1>So it's a performance based exam where you actually have

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<v Speaker 1>to show your skills. Yeah. Interesting. Before we even get

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<v Speaker 1>to the exam itself, the guide stresses setting up a

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<v Speaker 1>lab environment. Why is that so important?

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<v Speaker 2>It's crucial to have a dedicated space to practice the

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<v Speaker 2>commands and configurations you'll be tested on on the exam.

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<v Speaker 2>Think of it as your training ground for becoming an RHCSA.

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<v Speaker 1>Okay, makes sense. We need a place to experiment and

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<v Speaker 1>you know, hone our skills. What's the recommended setup for

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<v Speaker 1>this lab environment?

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<v Speaker 2>Well, the book suggests using virtual box, you know, to

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<v Speaker 2>create a virtual machine running Red Hat Enterprise Linux eight

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<v Speaker 2>or rh e L eight for short. This allows you

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<v Speaker 2>to run a simulated RHL environment on your existing computer.

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<v Speaker 1>So it's like having a computer inside your computer, which

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<v Speaker 1>is a great way to practice without affecting your main system.

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<v Speaker 1>What are the hardware requirements for running this virtual machine?

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<v Speaker 2>You'll want a a dual core processor at least AGB

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<v Speaker 2>of RAM and around twenty seven GB of free storage space. Additionally,

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<v Speaker 2>your computer's BIOS needs to have hardware virtualization enabled. This

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<v Speaker 2>allows your system to run the sixty four bit RHL

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<v Speaker 2>operating system smoothly within the virtual machine.

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<v Speaker 1>Okay, dual core processor, HB of RAM, twenty seven gigabees

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<v Speaker 1>of storage and hardware virtualization enabled. Got it? Now? This now,

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<v Speaker 1>this virtual machine setup. This isn't part of the exam itself, right,

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<v Speaker 1>It's just a crucial tool for our RHCSA preparation exactly.

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<v Speaker 2>The exam is all about your ability to perform tasks.

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<v Speaker 2>You know, so you need a safe and controlled environment

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<v Speaker 2>to practice and refine your skills. The virtual machine is

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<v Speaker 2>our sandbox for becoming RHCSA ready.

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<v Speaker 1>Perfect our lab is set up and we're ready to

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<v Speaker 1>dive into the world of Linux. But before we jump

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<v Speaker 1>into commands and configurations, let's take a quick trip down

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<v Speaker 1>memory lane and explore the fascinating history of Linux. What

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<v Speaker 1>can you tell us about its origins?

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<v Speaker 2>You might be surprised to learn that Linux has been

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<v Speaker 2>around for a while, you know, quietly powering much of

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<v Speaker 2>our digital world today. It all started back in the

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<v Speaker 2>early nineteen nineties with a finished student named Linus torvolds

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<v Speaker 2>was He was inspired by the Unix operating system and

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<v Speaker 2>decided to create his own version, you know, which he

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<v Speaker 2>called Linux.

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<v Speaker 1>The Linux is like a modern day reimagining of Unix,

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<v Speaker 1>born out of a student's passion project. That's incredible. What's

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<v Speaker 1>even more fascinating is that Linux is open source. What

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<v Speaker 1>does that mean exactly?

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<v Speaker 2>Open source. Open source means that the source code of

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<v Speaker 2>the software is freely available to anyone. It's like a

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<v Speaker 2>giant collaborative project where anyone can contribute, modify, and distribute

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<v Speaker 2>the software. This open nature is a big reason why

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<v Speaker 2>Linux is so popular and has been adopted by so many.

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<v Speaker 1>Yeah, it's like the ultimate community driven project, constantly being

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<v Speaker 1>refined and improved by developers developers worldwide. That's amazing. But

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<v Speaker 1>where does red hat fit into this picture? They're the

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<v Speaker 1>ones behind the RTSA exam right.

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<v Speaker 2>Red Hat is a major player in the Linux ecosystem.

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<v Speaker 2>They took the open source Linux kernel and build an

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<v Speaker 2>enterprise grade operating system called red Hat Enterprise Linux or RHL.

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<v Speaker 2>They provide commercial support, stability, and security, making RHL a

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<v Speaker 2>trusted choice for businesses and organizations worldwide.

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<v Speaker 1>So red Hat is like the professional business focused side

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<v Speaker 1>of Linux and strain that it's reliable and secure for

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<v Speaker 1>enterprise use. That makes a lot of sense. Now, to

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<v Speaker 1>truly become proficient in Linux, we need to understand the

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<v Speaker 1>fundamental building blocks. What's the first essential concept we need

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<v Speaker 1>to grasp?

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<v Speaker 2>Understanding the Linux directory structure is crucial. It's like the

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<v Speaker 2>blueprint of your of your operating system, showing you how

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<v Speaker 2>everything is organized.

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<v Speaker 1>The Linux directory structure is the blueprint. Got it? Can you? Can?

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<v Speaker 1>You break it down for us and explain how it works.

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<v Speaker 2>Think of it as a as a well organized filing cabinet.

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<v Speaker 2>Each each directory is like a drawer, and within those

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<v Speaker 2>jaws are files, which are like individual folders. Everything has

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<v Speaker 2>a specific place in this hierarchy, and knowing where things

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<v Speaker 2>are located is essential for managing your system effectively.

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<v Speaker 1>So we're talking about a hierarchical file system where everything

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<v Speaker 1>has its places. That's a great way to visualize it.

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<v Speaker 1>What are some of the key directories in this filing

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<v Speaker 1>cabinet that we should be familiar with.

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<v Speaker 2>You'll you'll want to know your way around. The root directory.

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<v Speaker 2>This is the home directory for the root user, the

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<v Speaker 2>all powerful administrator of the system. Then there's etc, which

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<v Speaker 2>stores system wide configuration files. It's it's like the control

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<v Speaker 2>panel for your your Linux machine. And of course there's VAR,

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<v Speaker 2>which holds data that changes frequently, like log files and

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<v Speaker 2>temporary files. Think of it as the system's working memory.

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<v Speaker 1>Okay, so Root for the root user, et cetera for

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<v Speaker 1>system wide configuration, and VAR for variable data. I'm starting

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<v Speaker 1>to see how this all fits together. But how do

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<v Speaker 1>we actually navigate this navigate this directory structure and interact

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<v Speaker 1>with files and directories. That's that's where the command line

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<v Speaker 1>comes in, right, you got it?

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<v Speaker 2>The command line is is your primary interface for interacting

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<v Speaker 2>with Linux and mastering a few essential commands. Is like

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<v Speaker 2>it's like learning a new language.

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<v Speaker 1>Okay, the command line is our language for communicating with Linux.

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<v Speaker 1>What are some of the first words we need to

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<v Speaker 1>learn in this new language.

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<v Speaker 2>Let's start with some basic navigation commands. PWD tells you

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<v Speaker 2>your present working directory you know, basically showing you where

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<v Speaker 2>you are in the file system. C D allows you

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<v Speaker 2>to change directories so you can you can move around

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<v Speaker 2>the structure. And l's lists the contents of a directory,

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<v Speaker 2>showing you the file and subdirectories within it.

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<v Speaker 1>Okay, PWD two to show our location, CD to move around,

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<v Speaker 1>and l's to see what's inside. Got it? But I'm

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<v Speaker 1>guessing l's can do more than just just provide a

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<v Speaker 1>simple list, right.

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<v Speaker 2>Absolutely. You can use options options with the the l's

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<v Speaker 2>command to get more specific information. For example, LS last

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<v Speaker 2>dash L gives you a detailed listing including file permissions,

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<v Speaker 2>ownership size, and modification date. This is incredibly helpful when

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<v Speaker 2>you need to understand who has access to what and

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<v Speaker 2>when files were changed.

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<v Speaker 1>Okay, LS dash SL for the details. Got it. We

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<v Speaker 1>can navigate directories and see what's inside. But what about

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<v Speaker 1>actually working with the with the files themselves. How do

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<v Speaker 1>we create, copy, move, and delete files in Linux?

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<v Speaker 2>Those are essential skills for any Linux user, and the

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<v Speaker 2>commands are they're pretty intuitive. To create a new empty file,

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<v Speaker 2>you use the TOUCH command followed by the file name.

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<v Speaker 2>To copy a file, use the CUP command specifying the

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<v Speaker 2>source file and the destination. To move a file, which

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<v Speaker 2>is like copying and deleting the original, you use the

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<v Speaker 2>MV command. And to delete a file you use the

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<v Speaker 2>ARM command. But be careful with this one.

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<v Speaker 1>Careful with ARM?

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<v Speaker 2>Why is that in Linux? When you delete a file

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<v Speaker 2>with ARMM, it's gone for good. There's there's no recycle,

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<v Speaker 2>bin or undelete options, so always double check before you

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<v Speaker 2>hit that delete key.

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<v Speaker 1>Got it? Touch to create, t copy, MVY to move,

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<v Speaker 1>and RM to delete with caution. Got it?

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<v Speaker 2>That's right. The kernel is managed just like other software packages,

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<v Speaker 2>you know, using RPM and DNF. There are different kernel

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<v Speaker 2>packages available, each serving a specific purpose.

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<v Speaker 1>Okay, so we have different different flavors of kernel packages.

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<v Speaker 1>What are some of the common ones we should we

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<v Speaker 1>should know about.

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<v Speaker 2>Well, there's the kernel package, which is you know, the

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<v Speaker 2>core kernel itself. Then there's kernel core containing a minimal

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<v Speaker 2>set of modules. Colonel Devil is for building kernel modules.

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<v Speaker 2>Kernel modules includes modules for commonly used hardware devices, and

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<v Speaker 2>kernel modules Extra has modules for less common devices. Finally,

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<v Speaker 2>we have kernel headers riding files files needed to build

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<v Speaker 2>external modules.

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<v Speaker 1>So many kernel packages. It seems like we have a

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<v Speaker 1>lot of flexibility in choosing the right kernel configuration for

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<v Speaker 1>for our system. And where all these where all these

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<v Speaker 1>kernel files actually stored on on the file system.

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<v Speaker 2>The kernel files reside mainly in the boot directory and

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<v Speaker 2>the lib modules directory.

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<v Speaker 1>Okay, boot and lib modules for for kernel files. Got it.

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<v Speaker 1>We've We've covered the boot process, g r u u

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<v Speaker 1>B two and and even kernel packages. It's it's fascinating

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<v Speaker 1>to see how all these all these pieces work together

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<v Speaker 1>to you know, bring our our Linux system to life.

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<v Speaker 1>But but our exploration doesn't doesn't stop here. We need

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<v Speaker 1>to We need to delve into the world of system

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<v Speaker 1>to a powerful and essential component of modern red hat Linux.

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<v Speaker 1>What what exactly is systemed and why is it so?

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<v Speaker 1>Why is it so important?

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<v Speaker 2>Systemed is a system and service manager, often referred to

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<v Speaker 2>as the heart of a of a modern Linux system.

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<v Speaker 2>It replaced the older innit system and brought significant improvements

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<v Speaker 2>in speedency, and management capabilities.

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<v Speaker 1>Okay, so, so system is the is the new and

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<v Speaker 1>improved way of managing services and system initialization. What what

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<v Speaker 1>makes it so much so much better than than the

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<v Speaker 1>old in its system?

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<v Speaker 2>Well, system does It's faster, more efficient, and provides a

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<v Speaker 2>unified interface for managing various various system components. It also

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<v Speaker 2>offers you know, advanced features like parallel service startup, on

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<v Speaker 2>demand service activation, and robust logging.

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<v Speaker 1>Faster and more efficient and packed with with advanced features.

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<v Speaker 1>System sounds sounds impressive, But let's let's break it down

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<v Speaker 1>into into manageable chunks. What are some what are some

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<v Speaker 1>key concepts we need to we need to understand about systems.

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<v Speaker 2>One of the fundamental concepts and systemed is the idea

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<v Speaker 2>of units. Units represent various various system resources and components

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<v Speaker 2>like services, devices, mount points, sockets, timers and more.

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<v Speaker 1>Okay, units are the are the building blocks of systems,

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<v Speaker 1>representing different different parts of the of the system. Got it?

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<v Speaker 1>What can we what can we actually do with these?

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<v Speaker 1>With these units?

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<v Speaker 2>We can manage their state. We can start, stop, restart,

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<v Speaker 2>enable and disable units using the system to ael command.

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<v Speaker 2>Enabling a unit means means it will automatically start at

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<v Speaker 2>boot time, while while disabling it prevents it from from starting.

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<v Speaker 1>So so system tattle is our is our command line

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<v Speaker 1>tool for for controlling these controlling these units and managing

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<v Speaker 1>their state. That's handy. But but you mentioned different types

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<v Speaker 1>of units, like like services, devices, and mountpoints. What's the

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<v Speaker 1>what's the distinction between these between these unit types each each.

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<v Speaker 2>Unit type represents a different kind of system resource. For example,

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<v Speaker 2>a service unit represents a background process like a web

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<v Speaker 2>server or a database. A device unit represents a physical

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<v Speaker 2>hardware device like a like a hard drive or a

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<v Speaker 2>network card, and a mount unit represents a file system

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<v Speaker 2>a filesystem mountpoint.

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<v Speaker 1>So we have so we have specialized unit types for

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<v Speaker 1>different different kinds of system components, making it easier to

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<v Speaker 1>manage them individually. That makes a lot of sense. But

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<v Speaker 1>you also you also meant targets earlier. What what are

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<v Speaker 1>targets and how do they how they fit into the

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<v Speaker 1>world a system.

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<v Speaker 2>Targets are are pre defined system states. They define a

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<v Speaker 2>collection of units that that should be running for a

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<v Speaker 2>specific state, like like multi user mode or graphical mode.

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<v Speaker 2>For example, the multi user dot target represents a system

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<v Speaker 2>running in multi user mode without a graphical interface, while

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<v Speaker 2>the graphical dot target represents a system a system with

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<v Speaker 2>a graphical interface.

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<v Speaker 1>Targets are like like pre configured system configurations, each with

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<v Speaker 1>its own set of active units. That's that's a clever

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<v Speaker 1>way to manage different system states. But how do we

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<v Speaker 1>how do we switch between these targets.

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<v Speaker 2>We use the system tittle isolate command to switch between targets.

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<v Speaker 2>For example, to switch to the multi user target, you

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<v Speaker 2>would type system tuttle isolate multi user dot target.

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<v Speaker 1>Okay, system to isolate to to activate a specific target.

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<v Speaker 1>Got it. But what if we want to What if

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<v Speaker 1>we want to change the default target, the one, the

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<v Speaker 1>one the system boots into automatically.

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<v Speaker 2>That's where the system title set default command comes in.

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<v Speaker 2>You simply specify the target you want to to make

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<v Speaker 2>the default. For instance, to make graphical dot target the default,

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<v Speaker 2>you would type system title set default graphical dot target.

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<v Speaker 1>System title set default to change the default boot target.

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<v Speaker 1>Got it.

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<v Speaker 2>We've we've covered units, targets, and the system title command,

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<v Speaker 2>which are which are core concepts and systems. But systemed

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<v Speaker 2>system does more than just managed services and system states.

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<v Speaker 2>It also, it also provides robust logging and easy access

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<v Speaker 2>to system information. That's right. System revolutionized logging in Linux

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<v Speaker 2>with the with the introduction of the journal.

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<v Speaker 1>The journal What is that exactly and how is it

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<v Speaker 1>different from from traditional logging systems.

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<v Speaker 2>The Journal is a centralized binary log that that stores

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<v Speaker 2>all system messages, including kernel messages, service logs, and audit trails.

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<v Speaker 2>It's it's designed for for performance and reliability, offering features

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<v Speaker 2>like structured logging and persistent storage.

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<v Speaker 1>So the Journal is is a modern, efficient way to

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<v Speaker 1>store and managed system logs. But how do we actually

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<v Speaker 1>how do we actually access and read these these journal logs?

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<v Speaker 1>If if they're stored in a binary format.

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<v Speaker 2>That's where the journal colitle command comes in handy. It's

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<v Speaker 2>it's a powerful tool for viewing, filtering, and searching the

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<v Speaker 2>journal logs. You can filter by time, severity, service unit,

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<v Speaker 2>or even specific keywords, making it easy to find the

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<v Speaker 2>information you need.

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<v Speaker 1>Okay, journal hile is our is our go to command

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<v Speaker 1>for exploring and analyzing the journal logs. Got it now?

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<v Speaker 1>Now you mentioned that system also provides easy access to

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<v Speaker 1>system information. What did you mean by that?

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<v Speaker 2>Well, system integrates with the PROC file system, which is

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<v Speaker 2>a virtual filesystem that exposes a wealth of real time

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<v Speaker 2>system information. It's it's like a window into the kernel,

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<v Speaker 2>providing insights into processes, memory, CPU, networking, and much more.

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<v Speaker 1>PROC a virtual file system that reveals the inner workings

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<v Speaker 1>of the of the kernel. Yeah, that's that's fascinating. What

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<v Speaker 1>kind of information can we can we find it?

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<v Speaker 2>In product you can find details about running processes, CPU utilization,

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<v Speaker 2>memory usage, network statistics, hardware configuration, loaded kernel modules, and

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<v Speaker 2>a lot more. It's it's an invaluable resource for for

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<v Speaker 2>monitoring and troubleshooting your system.

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<v Speaker 1>PROC sounds like like a treasure trove of information for systedmins.

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<v Speaker 1>We've we've covered services, system states, logging, and system information,

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<v Speaker 1>all all managed by by system. It's it's clearly clearly

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<v Speaker 1>a powerful and versatile system. But systems systems capabilities extend

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<v Speaker 1>extend beyond these, Beyond these core functions. It also plays

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<v Speaker 1>plays a crucial role in storage management.

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<v Speaker 2>That's right, we've already talked about, you know, partitions, LVM

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<v Speaker 2>and vdo Well Systems integrates seamlessly with these with these

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<v Speaker 2>storage technologies, providing a unified way to manage them.

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<v Speaker 1>Okay, so, so system extends its extends its reach to

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<v Speaker 1>storage management as well. How does it actually how does

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<v Speaker 1>it actually interact with our with our storage setup?

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<v Speaker 2>System has has dedicated unit types for managing partitions, LVM

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<v Speaker 2>volumes and even and even video volumes. We can use

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<v Speaker 2>the familiar systems to file command to to control these units,

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<v Speaker 2>just like we do with with service units.

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<v Speaker 1>So we can start, stop, enable and disable storage units

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<v Speaker 1>using system TIL just like we do as services. That's

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<v Speaker 1>that's convenient, but we also we also need to talk

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<v Speaker 1>about we also need to talk about filesystems. How does

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<v Speaker 1>how does systems fit into the picture when it When

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<v Speaker 1>it comes to managing.

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<v Speaker 2>Filesystems, system has a special unit type called a mount

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<v Speaker 2>unit that represents a filesystem filesystem mountpoint. Just like with

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<v Speaker 2>with other unit types, we can use system TIEL to

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<v Speaker 2>mount and unmount filesystems.

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<v Speaker 1>So so we're not limited to the to the traditional

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<v Speaker 1>mount and mount commands. We can now now use system

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<v Speaker 1>tiel to to manage file systems as well. That's that's

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<v Speaker 1>pretty powerful. But we also we also need to ensure

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<v Speaker 1>that these that these filesystems are mounted automatically at boot time.

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<v Speaker 1>How how does system to handle.

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<v Speaker 2>That system utilizes the the etcetera STAB file which stands

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<v Speaker 2>for you know, filesystem table. It's it's a configuration file

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<v Speaker 2>that lists the filesystems that should be mounted automatically at

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<v Speaker 2>boot time.

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<v Speaker 1>Okay, its center. STAB is still the place to define

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<v Speaker 1>automatic filesystem ounts.

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<v Speaker 2>Got it. We've we've explored system's role in managing services,

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<v Speaker 2>system states, logging, system information, storage, and file systems. It's.

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<v Speaker 2>It's truly the Swiss Army Knife of Linux system administration.

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<v Speaker 2>But before we before we move on, is there anything

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<v Speaker 2>else we should we should know about system for the

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<v Speaker 2>r HCSA exam.

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<v Speaker 1>Yes, systems can also be used for for system tuning,

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<v Speaker 1>allowing you to to optimize your your system's performance for

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<v Speaker 1>for specific workloads.

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<v Speaker 2>System tuning with with systems? Interesting? How does that work?

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<v Speaker 1>Red Hat? Red Hat provides a system tuning demon called

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<v Speaker 1>called Tuned, which is which is integrated with system too.

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<v Speaker 1>Tuned offers pre defined profiles for different use cases like

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<v Speaker 1>virtual guests, desktops, servers, and high performance computing. You can

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<v Speaker 1>you can switch between these profiles using the tuned at

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<v Speaker 1>M profile command, and Tuned will automatically adjust very system

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<v Speaker 1>settings to optimize performance for that for that specific workload.

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<v Speaker 1>So tuned is like a like a performance booster, allowing

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<v Speaker 1>us to tailor our our systems settings for for specific tasks.

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<v Speaker 2>That's pretty neat. We've We've covered a lot of ground

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<v Speaker 2>with system from from managing services and storage to to

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<v Speaker 2>optimizing performance. Now let's shift our focus to another to

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<v Speaker 2>another crucial domain for the for the rh essay exam networking.

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<v Speaker 2>What what networking concepts do we do we need to

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<v Speaker 2>grasp to to succeed in the r ht s A

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<v Speaker 2>exam and become proficient proficient Linux amins.

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<v Speaker 1>Networking is is the backbone of modern computing and and

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<v Speaker 1>understanding the fundamentals is essential for for any sysmin we

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<v Speaker 1>need to you know, understand network addressing, network interfaces, host

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<v Speaker 1>name resolution, time synchronization, and network security.

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<v Speaker 2>Okay, network addressing, interfaces, host names, timesinc. And security. That's

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<v Speaker 2>that's a lot to unpack. Let's let's start with network addressing.

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<v Speaker 2>What are the essential concepts we need to we need

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<v Speaker 2>to know.

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<v Speaker 1>The fundamental concept in networking is the is the IP address.

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<v Speaker 1>Every every device on a network on a network needs

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<v Speaker 1>a unique IP address to to communicate with other devices.

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<v Speaker 1>IP addresses are like the unique identifiers that allow devices

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<v Speaker 1>to to find and talk to each other on the network.

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<v Speaker 2>Got it? But I've heard of different versions of IP addresses,

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<v Speaker 2>IPv four and IPv six. What's what's the difference between

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<v Speaker 2>these two?

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<v Speaker 1>Well? IPP four is the older version and it uses

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<v Speaker 1>thirty two bit addresses, which which limits the number of

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<v Speaker 1>available unique addresses. IPC six is the newer version and

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<v Speaker 1>uses one hundred and twenty eight bit addresses, providing a

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<v Speaker 1>vastly larger address space to accommodate the growing number of

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<v Speaker 1>Internet connected devices.

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<v Speaker 2>So IPv four is the older, limited version. Well, IPv

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<v Speaker 2>six is the new or more expansive version. But how

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<v Speaker 2>do we how do we assign these How do we

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<v Speaker 2>assign these IP addresses to devices? And Linux?

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<v Speaker 1>That's where that's where network interfaces come into play. A

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<v Speaker 1>network interfaces is a physical or virtual connection point for

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<v Speaker 1>a device on a network. In Linux, we use various

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<v Speaker 1>tools like the the IP command and the network Manager

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<v Speaker 1>service to configure network interfaces and assign IP addresses. Okay,

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<v Speaker 1>so we so we use tools like IP and network

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<v Speaker 1>Manager to configure network interfaces and assign those all important,

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00:20:13.279 --> 00:20:16.279
<v Speaker 1>all important IP addresses. Got it? Well, once we once

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00:20:16.279 --> 00:20:19.359
<v Speaker 1>we have have IP addresses assigned. How do we how

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00:20:19.359 --> 00:20:21.799
<v Speaker 1>do we actually refer to these devices? Do we do?

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00:20:21.799 --> 00:20:23.960
<v Speaker 1>We have to memorize all those that memorize all those numbers.

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<v Speaker 2>That's where that's where host name resolution comes in. We

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<v Speaker 2>we assign human readable names called called host names two devices,

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<v Speaker 2>making it making it much easier to remember and refer

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00:20:33.359 --> 00:20:36.119
<v Speaker 2>to them. We can then use services like like DNS,

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00:20:36.240 --> 00:20:39.079
<v Speaker 2>the Domain Name System or or local hosts files to

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<v Speaker 2>translate these host names into their into their corresponding IP addresses.

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<v Speaker 1>Host names are like like friendly nicknames for for devices,

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<v Speaker 1>much easier to remember than than those cryptic IP addresses.

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<v Speaker 1>Got it? But what about what about time synchronization? Why

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<v Speaker 1>is that? Why is that important? In networking?

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<v Speaker 2>Time synchronization is crucial for various network services and applications.

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<v Speaker 2>If if the clocks on different systems are out of sync,

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<v Speaker 2>it can lead to all sorts of problems, from authentication

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<v Speaker 2>failures to to data inconsistencies.

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<v Speaker 1>Keeping our keeping our clocks in sync is important for

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<v Speaker 1>the smooth operation of the network. But how do we

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<v Speaker 1>How do we ensure time synchronization?

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<v Speaker 2>In Linux, we use the Network Time Protocol or NTP.

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<v Speaker 2>NTP allows us to to synchronize our system clock with

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<v Speaker 2>with reliable time sources over the over the network, ensuring

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00:21:28.480 --> 00:21:30.799
<v Speaker 2>ensuring accurate timekeeping NTP.

426
00:21:30.680 --> 00:21:34.440
<v Speaker 1>To keep our clocks in check. Got it. Now, let's

427
00:21:34.519 --> 00:21:36.559
<v Speaker 1>let's move on to the to the crucial topic of

428
00:21:36.960 --> 00:21:40.039
<v Speaker 1>network security. What what security measures do we do we

429
00:21:40.119 --> 00:21:42.440
<v Speaker 1>need to understand and implement In Linux?

430
00:21:42.720 --> 00:21:46.039
<v Speaker 2>One of the fundamental security tools is a is a firewall.

431
00:21:46.119 --> 00:21:50.279
<v Speaker 2>A A firewall acts as a barrier between your between

432
00:21:50.319 --> 00:21:53.839
<v Speaker 2>your system and the outside world, controlling which which network

433
00:21:53.839 --> 00:21:56.480
<v Speaker 2>traffic is allowed in and out, protecting your protecting your

434
00:21:56.519 --> 00:22:00.039
<v Speaker 2>system from from unauthorized access and malicious activity by.

435
00:22:00.200 --> 00:22:02.759
<v Speaker 1>Are like the like the gatekeepers of our of our network,

436
00:22:02.799 --> 00:22:05.319
<v Speaker 1>protecting us from from unwanted intrusions. Got it?

437
00:22:06.000 --> 00:22:08.720
<v Speaker 2>But how do we manage firewalls in Linux? What? What

438
00:22:08.880 --> 00:22:12.079
<v Speaker 2>tools are available? In Red Hat Enterprise Linux? The the

439
00:22:12.240 --> 00:22:16.359
<v Speaker 2>default firewall management tool is firewalled. Firewalled is a dynamic

440
00:22:16.480 --> 00:22:20.519
<v Speaker 2>firewall demon that provides a flexible and user friendly way

441
00:22:20.680 --> 00:22:23.480
<v Speaker 2>to to define and manage firewall rules.

442
00:22:23.640 --> 00:22:26.640
<v Speaker 1>Okay, firewalled is our is our firewall command center, allowing

443
00:22:26.720 --> 00:22:29.640
<v Speaker 1>us to configure and control network access.

444
00:22:29.839 --> 00:22:33.440
<v Speaker 2>Got it. Yeah, we've covered We've covered network addressing interfaces,

445
00:22:33.559 --> 00:22:37.920
<v Speaker 2>host names, time synchronization, and firewalls. What other what other

446
00:22:38.039 --> 00:22:40.680
<v Speaker 2>networking topics are essential for the the r h C

447
00:22:40.880 --> 00:22:44.559
<v Speaker 2>s A exam and our journey to becoming becoming Linux segments.

448
00:22:44.759 --> 00:22:46.839
<v Speaker 1>We need to we need to dive into the world

449
00:22:46.880 --> 00:22:49.960
<v Speaker 1>of remote management with SSH, which which stands for you know,

450
00:22:50.160 --> 00:22:51.200
<v Speaker 1>Secure shell.

451
00:22:51.400 --> 00:22:53.759
<v Speaker 2>S s H a secure way to connect to and

452
00:22:54.079 --> 00:22:56.519
<v Speaker 2>manage remote systems. What what makes s s H so

453
00:22:56.839 --> 00:23:00.160
<v Speaker 2>so special and why is it the preferred method for

454
00:23:00.559 --> 00:23:01.359
<v Speaker 2>remote administration.

455
00:23:01.720 --> 00:23:07.000
<v Speaker 1>SSH provides a secure, encrypted channel for communication between between systems,

456
00:23:07.039 --> 00:23:11.200
<v Speaker 1>protecting your data and credentials from eavesdropping and unauthorized access.

457
00:23:11.480 --> 00:23:14.160
<v Speaker 1>It allows you to log into remote systems, execute commands,

458
00:23:14.200 --> 00:23:17.079
<v Speaker 1>and even and even transfer files securely. So s SH

459
00:23:17.200 --> 00:23:20.839
<v Speaker 1>is our secure tunnel for a remote administration. Got it?

460
00:23:21.160 --> 00:23:24.440
<v Speaker 1>But how do we actually How do we actually use SSH?

461
00:23:25.119 --> 00:23:25.680
<v Speaker 1>In Linux?

462
00:23:26.000 --> 00:23:30.079
<v Speaker 2>The swash command is our gateway to remote systems. You

463
00:23:30.400 --> 00:23:33.680
<v Speaker 2>simply provide the host name or or IP address of

464
00:23:33.720 --> 00:23:36.400
<v Speaker 2>the remote system and the username you want to you

465
00:23:36.480 --> 00:23:39.720
<v Speaker 2>want to connect as. The swash command will then establish

466
00:23:39.960 --> 00:23:43.839
<v Speaker 2>a secure connection, prompting you for the user's password.

467
00:23:43.480 --> 00:23:46.720
<v Speaker 1>Okay thresh, followed by the host name or IP address

468
00:23:46.759 --> 00:23:49.480
<v Speaker 1>and the and the user name. Simple enough, but we

469
00:23:49.599 --> 00:23:51.559
<v Speaker 1>need to We need to make sure that the remote

470
00:23:51.599 --> 00:23:54.799
<v Speaker 1>system is configured to to accept SSH connections right.

471
00:23:54.839 --> 00:23:57.960
<v Speaker 2>Absolutely, the remote system needs to have an SSH server

472
00:23:58.200 --> 00:24:02.160
<v Speaker 2>running and configured to allownections from from authorized users and

473
00:24:02.519 --> 00:24:03.240
<v Speaker 2>IP addresses.

474
00:24:03.319 --> 00:24:04.720
<v Speaker 1>So we need it. So we need a running and

475
00:24:04.799 --> 00:24:07.680
<v Speaker 1>properly configured s SH server on the on the remote system.

476
00:24:07.720 --> 00:24:08.119
<v Speaker 1>Got it? Well?

477
00:24:08.119 --> 00:24:11.319
<v Speaker 2>What about what about transferring files between between systems? Can

478
00:24:11.519 --> 00:24:13.839
<v Speaker 2>we use s SH for for that as well? Well?

479
00:24:13.960 --> 00:24:16.480
<v Speaker 2>S ssh comes bundled with secure file transfer protocols s

480
00:24:16.559 --> 00:24:19.160
<v Speaker 2>c P and s FTP. DOT st P, which stands

481
00:24:19.240 --> 00:24:22.119
<v Speaker 2>for for Secure Copy, is a command line tool that

482
00:24:22.400 --> 00:24:25.359
<v Speaker 2>lets you copy. Let's you copy files between between systems.

483
00:24:25.400 --> 00:24:27.960
<v Speaker 2>Dot s f t P, or Secure File Transfer Protocol,

484
00:24:28.200 --> 00:24:32.200
<v Speaker 2>provides an interactive shell like interface for for browsing and

485
00:24:32.640 --> 00:24:33.440
<v Speaker 2>transferring files.

486
00:24:33.480 --> 00:24:36.160
<v Speaker 1>Okay, so we have CDP for for command line file

487
00:24:36.240 --> 00:24:39.119
<v Speaker 1>transfers and and s FTP for interactive file management over

488
00:24:39.519 --> 00:24:42.319
<v Speaker 1>over SSH. Got but but security is always always a

489
00:24:42.359 --> 00:24:44.200
<v Speaker 1>top priority. How can we make our How can we

490
00:24:44.240 --> 00:24:46.839
<v Speaker 1>make our SSH connections even more even more secure?

491
00:24:47.200 --> 00:24:50.279
<v Speaker 2>One way to enhance s SH security is by using

492
00:24:50.440 --> 00:24:52.720
<v Speaker 2>by using s SH key pairs and An s SH

493
00:24:52.799 --> 00:24:55.759
<v Speaker 2>key pair consists of a private key which which you

494
00:24:55.839 --> 00:24:57.480
<v Speaker 2>keep secret on your on your local system, and a

495
00:24:57.640 --> 00:24:59.519
<v Speaker 2>and a public key which you can you can share

496
00:24:59.559 --> 00:25:00.680
<v Speaker 2>with with remote servers.

497
00:25:00.759 --> 00:25:03.559
<v Speaker 1>Private key stay safe, public key can be shared. Got it?

498
00:25:03.920 --> 00:25:05.880
<v Speaker 1>But how do these how do these keys actually make

499
00:25:05.920 --> 00:25:08.519
<v Speaker 1>our make our SSH connections more more secure?

500
00:25:08.839 --> 00:25:12.480
<v Speaker 2>When you connect to a remote server using an s

501
00:25:12.599 --> 00:25:16.680
<v Speaker 2>s H key pair, the server uses your your public

502
00:25:16.759 --> 00:25:19.880
<v Speaker 2>key to authenticate you. This eliminates the need to enter

503
00:25:19.960 --> 00:25:23.039
<v Speaker 2>a enter a password every every time you connect, providing

504
00:25:23.319 --> 00:25:27.559
<v Speaker 2>a more secure and in convenient way to manage remote access.

505
00:25:27.839 --> 00:25:30.559
<v Speaker 1>So S s H key pairs not only enhanced security,

506
00:25:30.599 --> 00:25:33.680
<v Speaker 1>but also also make remote access more more convenient. That's

507
00:25:33.920 --> 00:25:36.759
<v Speaker 1>that's a win win situation. We've covered S s H

508
00:25:37.160 --> 00:25:40.200
<v Speaker 1>secure file transfers and and even s s H key pairs.

509
00:25:40.599 --> 00:25:43.359
<v Speaker 1>But what other what other networking security topics should we

510
00:25:43.440 --> 00:25:44.319
<v Speaker 1>should we be aware of?

511
00:25:44.440 --> 00:25:46.519
<v Speaker 2>For for the r C s C example, we need

512
00:25:46.599 --> 00:25:47.960
<v Speaker 2>to we need to talk about we need to talk

513
00:25:47.960 --> 00:25:50.960
<v Speaker 2>about CYLINICX, which stands for for Security Enhanced Linux CILINICX.

514
00:25:51.160 --> 00:25:53.960
<v Speaker 1>I've heard whispers of its power and complexity. What what

515
00:25:54.119 --> 00:25:56.359
<v Speaker 1>exactly is celinics and why is it, So why is

516
00:25:56.400 --> 00:25:58.279
<v Speaker 1>it so important for for Linux security?

517
00:25:58.599 --> 00:26:02.200
<v Speaker 2>Ce Linux is a powerful security mechanism that that provides

518
00:26:02.279 --> 00:26:05.920
<v Speaker 2>mandatory access control. It acts as an as an additional

519
00:26:06.039 --> 00:26:10.759
<v Speaker 2>layer of security beyond beyond traditional file permissions, enforcing strict

520
00:26:10.880 --> 00:26:14.160
<v Speaker 2>rules about which about which processes can access which resources

521
00:26:14.440 --> 00:26:16.680
<v Speaker 2>even if a user has the has the necessary the

522
00:26:16.759 --> 00:26:17.960
<v Speaker 2>necessary file permissions.

523
00:26:17.960 --> 00:26:20.359
<v Speaker 1>So Linux sounds like a like a strict but but

524
00:26:20.519 --> 00:26:23.079
<v Speaker 1>effective security guard for our for our Linux system.

525
00:26:23.240 --> 00:26:26.839
<v Speaker 2>Got it? But how how does Linux actually actually work?

526
00:26:26.880 --> 00:26:29.519
<v Speaker 2>What's the magic behind? It's behind the security enforcement.

527
00:26:29.559 --> 00:26:33.400
<v Speaker 1>So Linux assigns assigned security context to every process, file,

528
00:26:33.680 --> 00:26:36.599
<v Speaker 1>and and resource on the on the system. These security

529
00:26:36.680 --> 00:26:40.480
<v Speaker 1>context define the the rules governing how how those objects

530
00:26:40.559 --> 00:26:43.400
<v Speaker 1>can can interact. For example, a web server process might

531
00:26:43.480 --> 00:26:46.960
<v Speaker 1>have a security context that allows it to read web files,

532
00:26:47.000 --> 00:26:49.599
<v Speaker 1>but prevents it from from accessing system files even if

533
00:26:49.599 --> 00:26:51.720
<v Speaker 1>the even if the web server user has has read

534
00:26:51.720 --> 00:26:54.359
<v Speaker 1>permissions on those system files. So so Celinix operates on

535
00:26:54.559 --> 00:26:57.720
<v Speaker 1>a different level than than traditional file permissions, using security

536
00:26:57.799 --> 00:27:01.359
<v Speaker 1>contexts to define very grain dealer access rules. That's a

537
00:27:01.400 --> 00:27:04.640
<v Speaker 1>powerful way to enhance security. But how how are these

538
00:27:04.720 --> 00:27:07.039
<v Speaker 1>how are these security contexts actually actually assigned.

539
00:27:07.079 --> 00:27:11.119
<v Speaker 2>The Cylinx relies on a policy database that defines the

540
00:27:11.519 --> 00:27:15.240
<v Speaker 2>default security context for for various objects, and we can

541
00:27:15.359 --> 00:27:18.839
<v Speaker 2>use we can use Cylinux management tools to view, modify,

542
00:27:19.200 --> 00:27:21.559
<v Speaker 2>and and apply these these security.

543
00:27:21.200 --> 00:27:25.039
<v Speaker 1>Context Okay, cylinicx uses security context policies and dedicated management

544
00:27:25.079 --> 00:27:28.079
<v Speaker 1>tools to enforce enfoice, find grain access control.

545
00:27:28.200 --> 00:27:30.880
<v Speaker 2>Got it. But but Cylinics has a has a reputation

546
00:27:31.000 --> 00:27:35.359
<v Speaker 2>for being for being complex and sometimes causing sometimes causing issues.

547
00:27:35.400 --> 00:27:37.960
<v Speaker 2>If if not configure, not configure properly? How do we

548
00:27:38.160 --> 00:27:40.839
<v Speaker 2>how do we troubleshoot? How do we troubleshoot Celinux problems?

549
00:27:41.559 --> 00:27:44.160
<v Speaker 2>The the Cylinicx audit log is is our friend when

550
00:27:44.200 --> 00:27:46.119
<v Speaker 2>it when it comes to when it comes to troubleshooting

551
00:27:46.480 --> 00:27:51.319
<v Speaker 2>this this log records all all Cylinics events, including including denials,

552
00:27:51.440 --> 00:27:55.400
<v Speaker 2>providing providing valuable insights into into what's what's causing a

553
00:27:55.519 --> 00:27:58.160
<v Speaker 2>problem We can use. We can use tools like like

554
00:27:58.319 --> 00:28:02.720
<v Speaker 2>o search and and sealer to analyze the audit log

555
00:28:02.839 --> 00:28:06.680
<v Speaker 2>pinpoint the root cause of Selenics issues and resolve them.

556
00:28:06.880 --> 00:28:09.960
<v Speaker 1>The auditlog, O Search and Sealer are are our allies

557
00:28:10.039 --> 00:28:13.359
<v Speaker 1>in the in the battle against against Celnicx gremlins. Got it,

558
00:28:13.920 --> 00:28:18.079
<v Speaker 1>We've explored celinics and it's its role in enhancing Linux security.

559
00:28:18.400 --> 00:28:20.920
<v Speaker 1>Now let's switch switch gears and dells into the world

560
00:28:20.960 --> 00:28:22.200
<v Speaker 1>of network services.

561
00:28:22.519 --> 00:28:25.920
<v Speaker 2>Network services are the are the applications or processes that

562
00:28:26.359 --> 00:28:29.559
<v Speaker 2>that provide functionality over over a network. They're the heart

563
00:28:29.680 --> 00:28:33.039
<v Speaker 2>of modern networking, enabling everything from from web browsing and

564
00:28:33.319 --> 00:28:36.799
<v Speaker 2>email communication to file sharing and remote access.

565
00:28:37.039 --> 00:28:39.799
<v Speaker 1>Yeah, network services are the are the workhourses of the

566
00:28:39.960 --> 00:28:42.240
<v Speaker 1>of the network, providing all sorts of all sorts of

567
00:28:42.400 --> 00:28:46.960
<v Speaker 1>essential functions. But as but as CISS admins, what do

568
00:28:47.039 --> 00:28:50.000
<v Speaker 1>we what do we need to know about managing these

569
00:28:50.279 --> 00:28:51.200
<v Speaker 1>managing these services?

570
00:28:51.359 --> 00:28:54.279
<v Speaker 2>We need to to understand how to start, stop, restart,

571
00:28:54.319 --> 00:28:57.200
<v Speaker 2>and monitor and monitor these services. We also need to,

572
00:28:57.519 --> 00:28:59.839
<v Speaker 2>you know, know how to how to configure them to

573
00:29:00.039 --> 00:29:03.880
<v Speaker 2>start automatically at boot time, ensuring that they're they're always

574
00:29:03.880 --> 00:29:05.240
<v Speaker 2>available when when.

575
00:29:05.119 --> 00:29:09.599
<v Speaker 1>Needed, starting, stopping, restarting, monitoring, and configuring automatic startup the

576
00:29:09.720 --> 00:29:12.720
<v Speaker 1>essential lifecycle management tasks for for network services.

577
00:29:12.839 --> 00:29:15.119
<v Speaker 2>Got it? But how do we actually how do we

578
00:29:15.200 --> 00:29:18.400
<v Speaker 2>actually perform these these management tasks in in Linux? Are

579
00:29:18.400 --> 00:29:21.519
<v Speaker 2>there are there specialized tools for for network service management.

580
00:29:21.640 --> 00:29:24.839
<v Speaker 1>Remember remember systems it's not. It's not just a system

581
00:29:24.880 --> 00:29:27.319
<v Speaker 1>and service manager, it's also our it's also our go

582
00:29:27.480 --> 00:29:30.920
<v Speaker 1>to tool for for managing managing network services. We can

583
00:29:31.039 --> 00:29:33.920
<v Speaker 1>use the familiar system tickle command to to control the

584
00:29:34.000 --> 00:29:36.160
<v Speaker 1>state of the state of services and we can use

585
00:29:36.200 --> 00:29:40.880
<v Speaker 1>systems configuration files to manage to manage automatic startups. System

586
00:29:40.960 --> 00:29:43.559
<v Speaker 1>Dean have the Multi Talented Manager. It's it seems like

587
00:29:43.640 --> 00:29:45.680
<v Speaker 1>it can. It can handle almost everything in Linux. So

588
00:29:45.799 --> 00:29:48.079
<v Speaker 1>so we're back to system tail for managing network services

589
00:29:48.119 --> 00:29:48.440
<v Speaker 1>as well.

590
00:29:48.599 --> 00:29:51.720
<v Speaker 2>Got it? But but what about specific network services? Are

591
00:29:51.759 --> 00:29:54.160
<v Speaker 2>there any any that we should be we should be

592
00:29:54.240 --> 00:29:57.279
<v Speaker 2>particularly familiar with for the r HCSA exam.

593
00:29:57.960 --> 00:30:00.680
<v Speaker 1>One one important network service that's that's often covered in

594
00:30:00.759 --> 00:30:02.319
<v Speaker 1>the in the r h t S A exam is

595
00:30:02.359 --> 00:30:04.559
<v Speaker 1>the Network File System or or n f S.

596
00:30:04.759 --> 00:30:07.759
<v Speaker 2>N f S h a way to share files over

597
00:30:07.839 --> 00:30:11.039
<v Speaker 2>a over a network. That that sounds incredibly incredibly useful.

598
00:30:11.079 --> 00:30:13.759
<v Speaker 2>What what makes n f S so so special and

599
00:30:13.839 --> 00:30:15.160
<v Speaker 2>how does it? How does it actually work?

600
00:30:15.759 --> 00:30:18.720
<v Speaker 1>N f S allows us to share files and directories

601
00:30:18.799 --> 00:30:21.680
<v Speaker 1>over a over network, making them making them accessible to

602
00:30:22.160 --> 00:30:24.240
<v Speaker 1>to multiple systems as if they were as if they

603
00:30:24.279 --> 00:30:26.319
<v Speaker 1>were local. It operates on a on a client server

604
00:30:26.480 --> 00:30:29.599
<v Speaker 1>model where the server exports a directory or a set

605
00:30:29.599 --> 00:30:33.039
<v Speaker 1>of directories and the and the client mounts those exports

606
00:30:33.079 --> 00:30:36.599
<v Speaker 1>onto its own file system, making the shared files appears

607
00:30:36.799 --> 00:30:39.079
<v Speaker 1>as part of its part of its local directory structure.

608
00:30:39.240 --> 00:30:41.920
<v Speaker 1>So so the server, the server makes makes files available,

609
00:30:42.200 --> 00:30:45.000
<v Speaker 1>and the and the client, the client indicates those those

610
00:30:45.039 --> 00:30:48.240
<v Speaker 1>files into its into its own filesystem. That's a that's

611
00:30:48.279 --> 00:30:50.920
<v Speaker 1>a clever way to share resources across across a network.

612
00:30:51.400 --> 00:30:52.839
<v Speaker 1>But how do we how do we set up and

613
00:30:53.079 --> 00:30:54.440
<v Speaker 1>configure n f S in Linux.

614
00:30:54.680 --> 00:30:57.440
<v Speaker 3>On the service side, we we edit the exports file

615
00:30:57.480 --> 00:30:59.960
<v Speaker 3>to to define which which directories to export in which

616
00:31:00.119 --> 00:31:02.839
<v Speaker 3>and which clients are allowed to access them. We also

617
00:31:02.920 --> 00:31:05.799
<v Speaker 3>need to start the NFS service service to to make

618
00:31:05.920 --> 00:31:08.519
<v Speaker 3>the shares available on the On the client side, we

619
00:31:08.680 --> 00:31:12.359
<v Speaker 3>use the mount command to mount the the NFS exports

620
00:31:12.359 --> 00:31:15.519
<v Speaker 3>from the server, specifying the specifying the server's host name

621
00:31:15.640 --> 00:31:17.960
<v Speaker 3>or IP address, and the and the path to the

622
00:31:18.559 --> 00:31:19.839
<v Speaker 3>the exported directory.

623
00:31:19.960 --> 00:31:22.440
<v Speaker 1>So we so we configure the shares on the on

624
00:31:22.519 --> 00:31:25.519
<v Speaker 1>the server using its exports and start the NFS server

625
00:31:25.839 --> 00:31:27.279
<v Speaker 1>and then we and then we mount the shares on

626
00:31:27.319 --> 00:31:29.720
<v Speaker 1>the client using the using the mount command. Got it?

627
00:31:30.079 --> 00:31:33.799
<v Speaker 3>But as always security is paramount. How do we how

628
00:31:33.839 --> 00:31:36.160
<v Speaker 3>do we ensure that our that our NFS shares are

629
00:31:36.240 --> 00:31:38.960
<v Speaker 3>secure and protected from protected from unauthorized access.

630
00:31:39.240 --> 00:31:43.200
<v Speaker 2>We can implement various security mechanisms to to protect our

631
00:31:43.400 --> 00:31:47.079
<v Speaker 2>to protect our NFS shares, including including IP address restrictions,

632
00:31:47.200 --> 00:31:50.240
<v Speaker 2>user authentication, and seal Linux policies.

633
00:31:50.839 --> 00:31:51.039
<v Speaker 1>Bye.

634
00:31:51.480 --> 00:31:55.519
<v Speaker 2>By carefully configuring these these security measures, we can you know,

635
00:31:55.680 --> 00:31:59.319
<v Speaker 2>control access to to our shared files and prevent prevent

636
00:31:59.400 --> 00:32:00.480
<v Speaker 2>unauthorized access.

637
00:32:00.839 --> 00:32:05.160
<v Speaker 1>Okay, as securing securing NFS shares is crucial and Linux

638
00:32:05.200 --> 00:32:08.160
<v Speaker 1>provides the tools and mechanisms yeah, to do so, to

639
00:32:08.240 --> 00:32:10.759
<v Speaker 1>do so effectively. Yeah, we've covered We've covered network service

640
00:32:10.759 --> 00:32:13.640
<v Speaker 1>assystem management and even and even NFS. But our but

641
00:32:13.759 --> 00:32:17.599
<v Speaker 1>our exploration of networking, of networking continues. What other what

642
00:32:17.759 --> 00:32:20.279
<v Speaker 1>other networking topics are are essential for the r e

643
00:32:20.480 --> 00:32:23.000
<v Speaker 1>c s A exam and our journey to becoming becoming

644
00:32:23.039 --> 00:32:24.319
<v Speaker 1>proficient Linux segments.

645
00:32:24.559 --> 00:32:27.720
<v Speaker 2>Another another critical critical skill for any sysedmin is is

646
00:32:27.799 --> 00:32:31.680
<v Speaker 2>network troubleshooting. Networks can be can be complex and problems

647
00:32:31.720 --> 00:32:34.279
<v Speaker 2>can arise unexpectedly. We need to be able to you know,

648
00:32:34.680 --> 00:32:37.880
<v Speaker 2>diagnose and resolve these problems, these problems efficiently to keep

649
00:32:37.920 --> 00:32:39.799
<v Speaker 2>the network, keep the network running smoothly.

650
00:32:40.119 --> 00:32:43.960
<v Speaker 1>Network troubleshooting the art of of unraveling network mysteries and

651
00:32:44.119 --> 00:32:47.400
<v Speaker 1>and restoring order. Yeah, got it, But network network troubleshooting

652
00:32:47.480 --> 00:32:50.440
<v Speaker 1>can can seem can seem taunting. Where do we? Where

653
00:32:50.480 --> 00:32:53.279
<v Speaker 1>do we even begin? When? When faced with with a

654
00:32:53.359 --> 00:32:54.559
<v Speaker 1>network with a network.

655
00:32:54.319 --> 00:32:56.519
<v Speaker 2>Issue, one of the first steps is to is to

656
00:32:56.640 --> 00:32:59.400
<v Speaker 2>check the check the network configuration we can use. We

657
00:32:59.440 --> 00:33:02.359
<v Speaker 2>can use commands like like IP adder show to view

658
00:33:02.640 --> 00:33:06.759
<v Speaker 2>the the IP addresses and status of of our network interfaces.

659
00:33:07.400 --> 00:33:10.400
<v Speaker 2>We can also use the the ping command to test

660
00:33:10.559 --> 00:33:13.759
<v Speaker 2>to test connectivity to other systems, ensuring that that basic

661
00:33:13.880 --> 00:33:15.759
<v Speaker 2>basic network communication is working.

662
00:33:15.920 --> 00:33:18.480
<v Speaker 1>Okay, check the configuration using commands like like IP add

663
00:33:18.519 --> 00:33:20.880
<v Speaker 1>or show and and test and test basic connectivity with

664
00:33:21.359 --> 00:33:24.200
<v Speaker 1>with ping What other what other troubleshooting tools are are

665
00:33:24.240 --> 00:33:25.880
<v Speaker 1>available in our Linux toolbox.

666
00:33:26.079 --> 00:33:29.480
<v Speaker 2>Another another useful useful tool is is tracee route. Trace

667
00:33:29.559 --> 00:33:32.480
<v Speaker 2>route shows us the path that that packets packets take

668
00:33:32.559 --> 00:33:35.759
<v Speaker 2>through the network, helping us helping us identify routing problems

669
00:33:35.960 --> 00:33:38.599
<v Speaker 2>or or bottlenecks along the way. If if packets are

670
00:33:38.640 --> 00:33:42.000
<v Speaker 2>getting you know, lost or or delayed. Trace route can

671
00:33:42.039 --> 00:33:45.680
<v Speaker 2>provide valuable valuable clues about about where the problem, where

672
00:33:45.720 --> 00:33:46.279
<v Speaker 2>the problem.

673
00:33:46.279 --> 00:33:49.400
<v Speaker 1>Was, trace root are our network path explore? Got it?

674
00:33:49.960 --> 00:33:53.160
<v Speaker 1>But but what if we're dealing with with DNS problems,

675
00:33:53.240 --> 00:33:56.559
<v Speaker 1>those issues that prevent us from resolving host names into

676
00:33:56.680 --> 00:33:59.680
<v Speaker 1>into IP addresses. Are there are there any tools specifically

677
00:33:59.799 --> 00:34:02.200
<v Speaker 1>for or for DNS DNS troubleshooting.

678
00:34:02.359 --> 00:34:05.720
<v Speaker 2>Absolutely, the dig command is a versible tool for querying,

679
00:34:06.079 --> 00:34:10.079
<v Speaker 2>for querying DNS servers, and troubleshooting troubleshooting name resolution issues.

680
00:34:10.400 --> 00:34:14.079
<v Speaker 2>It allows us to you know, test, test DNS configuration, verify,

681
00:34:14.280 --> 00:34:17.719
<v Speaker 2>verify DNS records, and identify problems with with DNS servers

682
00:34:17.800 --> 00:34:19.599
<v Speaker 2>or the or the DNS resolution process.

683
00:34:19.800 --> 00:34:22.639
<v Speaker 1>Okay, dig is our is our DNS detective helping us

684
00:34:22.679 --> 00:34:26.800
<v Speaker 1>uncover the root cause of name resolution problems. Got it?

685
00:34:27.599 --> 00:34:31.639
<v Speaker 1>So we have tools for checking configuration, testing connectivity, tracing routes,

686
00:34:32.039 --> 00:34:35.000
<v Speaker 1>and even troubleshooting DNS. That's a pretty that's a pretty

687
00:34:35.039 --> 00:34:39.000
<v Speaker 1>solid toolkit for for tackling those those pesky peski network issues.

688
00:34:39.119 --> 00:34:41.519
<v Speaker 1>But our but our exploitation doesn't doesn't stop there? What

689
00:34:41.800 --> 00:34:44.360
<v Speaker 1>other networking challenges await us on our on our our

690
00:34:44.440 --> 00:34:45.280
<v Speaker 1>h c s a journey.

691
00:34:45.360 --> 00:34:48.679
<v Speaker 2>You're right, network troubleshooting, it often involves, you know, delving

692
00:34:48.719 --> 00:34:52.119
<v Speaker 2>deeper into specific protocols and services for the rt csa exam.

693
00:34:52.559 --> 00:34:55.119
<v Speaker 2>It's it's helpful to have a good grasp of common

694
00:34:55.159 --> 00:34:57.920
<v Speaker 2>services like like d h CP, DNS, and and.

695
00:34:58.119 --> 00:34:59.920
<v Speaker 1>H T t P. Okay, so we're talking about det

696
00:35:00.039 --> 00:35:03.920
<v Speaker 1>CP for automatically assigning IP addresses, DNS for translating host

697
00:35:04.039 --> 00:35:07.159
<v Speaker 1>names into IP addresses, and HTTP for for web communication.

698
00:35:07.679 --> 00:35:10.440
<v Speaker 1>What what kind of troubleshooting scenarios might we might we

699
00:35:10.599 --> 00:35:11.719
<v Speaker 1>encounter with these services?

700
00:35:11.880 --> 00:35:15.079
<v Speaker 2>With with DHCP, we we might need to troubleshoot issues

701
00:35:15.119 --> 00:35:18.599
<v Speaker 2>where where clients are not receiving IP addresses correctly. This

702
00:35:18.679 --> 00:35:23.719
<v Speaker 2>could involve you know, checking the DHCP server configuration, network connectivity,

703
00:35:23.840 --> 00:35:25.519
<v Speaker 2>or even or even client side settings.

704
00:35:25.800 --> 00:35:29.239
<v Speaker 1>So so DTP troubleshooting is all about making sure those

705
00:35:29.320 --> 00:35:33.519
<v Speaker 1>IP addresses are flowing flowing smoothly. What about what about DNS?

706
00:35:33.639 --> 00:35:36.639
<v Speaker 1>What kinds of what kinds of DNS problems might might

707
00:35:36.679 --> 00:35:37.239
<v Speaker 1>we encounter?

708
00:35:37.519 --> 00:35:41.800
<v Speaker 2>DNS issues often often revolve around around name resolution failures.

709
00:35:41.880 --> 00:35:44.360
<v Speaker 2>We we might see eras like like hosts not found

710
00:35:44.639 --> 00:35:49.119
<v Speaker 2>or or experience slow slow website loading times. Troubleshooting DNS

711
00:35:49.239 --> 00:35:53.840
<v Speaker 2>often involves checking, checking DNS server configuration, verifying, verifying DNS records,

712
00:35:53.880 --> 00:35:56.079
<v Speaker 2>and testing DNS resolution from clients.

713
00:35:56.239 --> 00:35:59.280
<v Speaker 1>DNS troubleshooting it's it's like detective work, tracking down those

714
00:35:59.599 --> 00:36:02.599
<v Speaker 1>those name resolution culprits. What about what about e GTP?

715
00:36:02.760 --> 00:36:05.159
<v Speaker 1>What kinds of what kinds of HTTP issues might pop

716
00:36:05.320 --> 00:36:05.800
<v Speaker 1>might pop up?

717
00:36:06.039 --> 00:36:10.039
<v Speaker 2>HGTP problems often often manifests as website errors, like like

718
00:36:10.159 --> 00:36:12.679
<v Speaker 2>the dreaded four or four not found or or five

719
00:36:12.800 --> 00:36:16.719
<v Speaker 2>hundred internal server ARA troubleshooting. Troubleshooting HTTP issues usually involves

720
00:36:16.800 --> 00:36:20.519
<v Speaker 2>checking web server configuration and examining webserver logs and testing

721
00:36:20.719 --> 00:36:22.320
<v Speaker 2>testing web server connectivity.

722
00:36:22.599 --> 00:36:26.639
<v Speaker 1>Okay, so we've got d HCP, DNS, and HTTP troubleshooting

723
00:36:27.320 --> 00:36:30.920
<v Speaker 1>on our on our radar. It seems like like. Network

724
00:36:30.920 --> 00:36:35.320
<v Speaker 1>troubleshooting often often involves a combination of of checking configurations,

725
00:36:35.440 --> 00:36:39.920
<v Speaker 1>analyzing logs, and testing and testing connectivity exactly and and remember,

726
00:36:40.000 --> 00:36:44.840
<v Speaker 1>good network troubleshooting involves a systematic approach. Start with the basics, gather,

727
00:36:45.000 --> 00:36:48.559
<v Speaker 1>gather information, and use the available tools to narrow down

728
00:36:48.599 --> 00:36:52.440
<v Speaker 1>the narrow down the problem. Okay, systematic network troubleshooting, got it,

729
00:36:52.519 --> 00:36:54.320
<v Speaker 1>We've covered a ton of ground. In this In this

730
00:36:54.480 --> 00:36:57.119
<v Speaker 1>deep dive into the into the r h CSA exam

731
00:36:57.280 --> 00:37:00.440
<v Speaker 1>and Linux essentials, from setting up a lab in environment,

732
00:37:00.719 --> 00:37:04.360
<v Speaker 1>to mastering the command line, navigating the file system, managing

733
00:37:04.440 --> 00:37:08.079
<v Speaker 1>users and groups, diving into shell scripting, understand package management,

734
00:37:08.159 --> 00:37:12.159
<v Speaker 1>demystifying the boot process, and becoming best friends with with system.

735
00:37:12.239 --> 00:37:14.239
<v Speaker 1>We've We've tackled that, We've tackled it all, and of

736
00:37:14.280 --> 00:37:17.840
<v Speaker 1>course we explored the world of networking IP addresses, host names,

737
00:37:18.039 --> 00:37:21.840
<v Speaker 1>time syncretization, s SH, firewalls, CIRAH, Linux network services, and

738
00:37:22.079 --> 00:37:23.199
<v Speaker 1>even troubleshooting tips.

739
00:37:23.400 --> 00:37:25.360
<v Speaker 2>It's been quite a quite a journey. But but what's

740
00:37:25.440 --> 00:37:27.800
<v Speaker 2>what's fascinating here is that is that this is this

741
00:37:27.960 --> 00:37:31.480
<v Speaker 2>is just the beginning. The world of Linux system administration

742
00:37:31.800 --> 00:37:35.800
<v Speaker 2>is is vast and constantly evolving. There's always more to

743
00:37:36.079 --> 00:37:40.199
<v Speaker 2>more to learn, more to explore, and new challenges to conquer.

744
00:37:40.599 --> 00:37:42.599
<v Speaker 1>So so what does this all? What does this all

745
00:37:42.719 --> 00:37:46.280
<v Speaker 1>mean for for you, our dedicated listener who's bravely embarking

746
00:37:46.360 --> 00:37:49.039
<v Speaker 1>on the on the r at CSA path With all

747
00:37:49.119 --> 00:37:52.079
<v Speaker 1>this newfound knowledge swirling around, what's the what's the most

748
00:37:52.119 --> 00:37:52.960
<v Speaker 1>important takeaway?

749
00:37:53.079 --> 00:37:55.559
<v Speaker 2>I'd say that the key is to to remember that

750
00:37:55.679 --> 00:37:59.920
<v Speaker 2>the r CSA exam isn't isn't just about about memorizing command.

751
00:38:00.199 --> 00:38:04.159
<v Speaker 2>It's about it's about understanding the underlying concepts, applying those

752
00:38:04.519 --> 00:38:08.760
<v Speaker 2>those concepts in practical scenarios, and and developing the developing

753
00:38:08.800 --> 00:38:11.440
<v Speaker 2>the problem solving skills that are essential for for any

754
00:38:11.559 --> 00:38:12.599
<v Speaker 2>successful sosatmen.

755
00:38:13.039 --> 00:38:15.880
<v Speaker 1>So it's not it's not about rope memorization. It's about

756
00:38:15.920 --> 00:38:19.199
<v Speaker 1>it's about understanding the why behind the what makes sense.

757
00:38:19.280 --> 00:38:22.519
<v Speaker 1>This deep dive has has given you a solid foundation

758
00:38:22.800 --> 00:38:25.760
<v Speaker 1>to build upon. Now now it's time to put that

759
00:38:26.039 --> 00:38:28.639
<v Speaker 1>put that knowledge into into practice. Yeah, fire up that

760
00:38:28.760 --> 00:38:31.280
<v Speaker 1>lab environment, get your hands dirty with those commands, and

761
00:38:31.559 --> 00:38:33.800
<v Speaker 1>and don't be and don't be afraid to experiment. Remember

762
00:38:33.880 --> 00:38:37.039
<v Speaker 1>every every error is a is a learning opportunity.

763
00:38:36.800 --> 00:38:40.400
<v Speaker 2>Exactly, embrace the challenge and and don't hesitate to seek

764
00:38:40.960 --> 00:38:42.760
<v Speaker 2>seek help when you when you need it. There's a

765
00:38:42.880 --> 00:38:45.599
<v Speaker 2>there's a vibrant, vibrant Linux community out there, full of

766
00:38:45.760 --> 00:38:47.920
<v Speaker 2>full of helpful folks who are always always willing to

767
00:38:48.039 --> 00:38:50.400
<v Speaker 2>share their knowledge and experience.

768
00:38:50.800 --> 00:38:53.599
<v Speaker 1>So true, and with that we've reached the end of

769
00:38:53.679 --> 00:38:55.039
<v Speaker 1>our rh c s A deep dive.

770
00:38:55.119 --> 00:38:57.679
<v Speaker 3>We hope you've enjoyed the journey and feel and feel

771
00:38:57.719 --> 00:39:01.480
<v Speaker 3>empowered to continue your your Linux adventure and and as

772
00:39:01.519 --> 00:39:03.800
<v Speaker 3>you delve deeper into the world of system administration. Here's

773
00:39:03.840 --> 00:39:06.719
<v Speaker 3>a final, a final, thought provoking question to ponder.

774
00:39:07.440 --> 00:39:11.760
<v Speaker 1>Knowing that Linux powers everything from tiny, tiny embedded devices

775
00:39:11.840 --> 00:39:14.599
<v Speaker 1>to to massive supercomputers, what what kind of impact do

776
00:39:14.639 --> 00:39:15.920
<v Speaker 1>you do you want to make with your with your

777
00:39:15.960 --> 00:39:18.280
<v Speaker 1>newfound Linux Linux skills, think

778
00:39:18.280 --> 00:39:21.039
<v Speaker 3>About it, Explore the explore the possibilities, and let your

779
00:39:21.079 --> 00:39:22.519
<v Speaker 3>your Linux journey journey begin.