Red Hat Certified System Administrator (EX200) – RHCSA Exam Prep
Linux Training Architect I in Content
This prep course designed by the Linux Academy takes the public objects for Red Hat's RHCSA 7 certification and puts you on the path to succeed the examination. At Linux Academy, we want to provide you with an in-depth understanding of managing a Red Hat system at an administrator level so that you can use your skills on real servers in the real world. The Linux Academy is in no away affiliated with Red Hat, Inc, and this course is not provided or reviewed by Red Hat, Inc.
While the majority of this RHCSA course applies to both RHEL 7 and RHEL 8, there are some RHEL 8 specific updated lessons at the end of this course.
About the Course
The Red Hat Certified Systems Administrator course covers a wide array of content that every administrator should know. Understanding and working with these tools will be vital both for the RHCSA exam and in your career moving forward. This video covers what prerequisites are required.
About the Author
In this video you learn about me! My name is Rob Marti. My IT career has run the gamut of call center support, hardware repair, managing servers for a university, and finally - before I came to Linux Academy - working at Open Source giant Red Hat. I've held many certifications over the years including Red Hat's Clustering, Performance Tuning, Satellite, and a few others. I'm excited to help serve the Community here at Linux Academy!
About the Exam
This lesson covers information about the RHCSA exam. We go over the different objectives on the exam and some information about the exam environment.
Red Hat Enterprise Linux 8 Update
Recently Red Hat announced an extension of the deprecation of the RHEL 7 version of the RHCSA. This lesson talks about when that has been extended to and what it means to you, the learner.
Understand and Use Essential Tools
Redirecting input, output, and error messages will be a useful skill throughout a system administrators career. Whether it's saving output for analysis later, being able to easily save portions of a log file, or making batch commands simpler, you're going to need to understand how this all works. This video covers that and pipes, which allow for stringing commands together.
Using grep and Regular Expressions
grep is a super powerful tool for finding specific information in the flood of files that system adminstrators often find themselves sifting through.
In this course we'll look at some small examples of the things
grep can do, and learn about some of the power of regular expressions.
Accessing Remote Systems with ssh
SSH is one of the most used utlities in a system administrater's arsenal. In this course we cover some of the most used flags, how to use
ssh and how to X11 forward.
Logging in and Switching Users
As part of normal sysadmin duties you'll need to switch between users for troubleshooting and service design. Understanding how a user's environment interacts with the
su command is an important skill. In this video we cover that command and explain a little about environments.
Compressing and Decompressing Files
Archiving and compressing files is a useful skill when it comes to designing backup methods. Here, we'll go over some standard compression/archive tools.
Creating and Manipulating Files
In this course we'll go over how to create and manage files in Linux, and what a file is exactly. Using different commands to create, edit, and manipulate files is an important skill for a Linux administrator. So is the ability to find files when you're not sure where they are.
Hard and soft links have some important distinctions from regular files. In this lesson we'll go through some of the differences, and show some of the capabilties.
Understanding how permissions are set on files helps to understand how and why you or your users might run into problems accessing files or commands. This course will help to understand what the permissions mean and how to set or change them.
File Permissions: umask
umask is used to determine the default permissions a new file or directory is created with. This lesson goes over what a mask is, how it works, and how to change it.
Using System Documentation
Using documentation that already exists on your system can often save some frustration related to innacurate information found by searching the web. Knowing where that information exists on your system is a challenge, however. This course aims to solve that challenge and give you the information needed to succeed.
Operate Running Systems
Managing the Boot Process
Knowing how a server boots and how to interrupt the process for maintenance is an important skill. This video covers that and covers one of the most frustrating things you'll have to do: reset the root password on a server.
Managing Individual Processes
From understanding what processes are running, to setting priorities for running processes, understanding how to manage them is an important skill for any administrator. This video covers how to figure out what's running, how to manage those processes, and what a load average is.
An important skill is knowing where to look when things are going wrong.
In this video, we cover where and how things are logged, and a quick peek into how the
systemd journal works.
Even though a significant portion of companies are moving towards using containers, Virtual Machines still have their place. In this lesson we'll go over how to set up a Red Hat Enterprise Linux server as a Virtual Host, and how to install and manage VMs using both the CLI and the GUI.
Starting and stopping services is a skill system administrators need to have. This video covers how to do it, and how to get information about services whether they're running or not.
The easiest way to get files from one place to another is to copy them over the network. This video will walk through doing it in a secure, encrypted manner.
Configure Local Storage
Working with logical volumes is much easier than partitioning disks, when it comes to adding space to a mount point. There's less down time and less risk involved with using LVM. LVM also makes things easier to manage in general. In this video, we'll go over how to create and manage logical volumes.
Partition manipluation is important for setting up and expanding servers. You'll need to be able to create, delete, and change the type of partitions. You should also know some of the differences between GPT and MBR partition types.
Managing Mounted Disks
Knowing how to look at and use things like UUIDs or filesystem labels is another important skill for Linux system administrators. This video covers that and goes into some detail on how to configure those settings for different filesystems.
Create and Configure File Systems
Network File Systems
NFS and SMB network file systems are commonly used to share files throughout a datacenter. This lesson will walk through some simple set ups so that you can become familiar with how they work and how to configure them.
File Permissions: ACLs
Sometimes the normal octal permissions structure isn't granular enough. When that happens, filesystem ACLs can help. This lesson will help you understand what ACLs are, when to use them, and how to apply them.
Deploy, Configure, and Maintain Systems
We've got to decide on a network configuration when we're designing and deploying new systems. This video will help to understand how to set a network up for success.
Network Time Protocol
Having a consistent time available to reference is important for many things, like easier troubleshooting in a multi-system environment. Network Time Protocol (NTP) is how we can be set up for success. This video covers some information about NTP.
From scheduling one-off jobs to making sure a command runs as often as required, you'll need to know how to schedule jobs. This video goes over the three primary ways to do it.
Modifying the System Bootloader
Modifying what kernel the system is going to boot into is important for troubleshooting. Knowing how to change the boot target from the running operating system (rather than at the console while booting up) is definitely a useful skill. This video covers that and how to get information about the running kernel.
Updating and Installing Packages
What good are servers without software to run? In this video we'll cover how to install software and how to configure yum.
Using LDAP for Authentication
In this lesson we'll address setting up LDAP authentication. Understanding this will allow you to use a single, central, authoritative source for user information, rather than each server using its own user information.
Using LDAP for Authentication
Manage Users and Groups
Manipulating User Accounts
Manipulating and maintaining user accounts is necessary for the health of your environment. In this video we learn how to manipulate and create user accounts.
Password Management and Aging
Managing accounts is an important part of managing security for your server. This video covers managing password aging, both individually and system wide, as new accounts are created.
Managing group access is almost as important as managing user access. This video goes over how to do it, and some of the things that are possible with primary and supplementary groups.
Configuring the Firewall
Managing the firewall in Red Hat Enterprise Linux is a task that many admins will be called upon to do. This video goes over some of the ways to do so, and an explantion about what
firewalld zones are.
SELinux has a troubled past but isn't as bad as it's been made out to be. In this lesson we'll go over the basics of SELinux and how to troubleshoot potential issues.
RHCSA 8 Updates
Adjust Process Priorities
Since each server is running hundreds of processes all the time, how does the kernel figure out what process is more important than other ones? Should that text editor over there get more or equal CPU time to the database that keeps your business running? No, it shouldn't. In this lesson we learn about process priorities and how to change them if needed.
journald journals don't persist through reboots. This means that it's more difficult to use the power of the
journald metadata to assist in your troubleshooting endeavors. In this lesson we go over how to make these journals persistent and why you'd choose to do so.
Disk Compression (Virtual Disk Optimizer)
There's no such thing as too much storage in today's datacenters. You could use userland tools like gzip to compress data and save space - but you'll run into issues with ease of access and time spent compressing and extracting the required data. Linux has adopted the Virtual Data Optimizer (VDO) layer as a method of essentially trading CPU and RAM resources for disk space. In this lesson we go over what VDO is and how to implement it, in addition to some of the things to keep in mind while evaluating the use of VDO in your infrastructure.
Using the AppStream (yum modules)
The AppStream is a new tool added by Red Hat in RHEL8. It allows admins to install different versions of popular software, in addition to different profiles for different packages (for example, a minimal
httpd server). Understanding how modules work and how to interact with them will be helpful in both passing the RHCSA and administering RHEL8 servers.
Adjust Real Time Process Priorities (chrt)
The Linux kernel keeps track of what processes get CPU time by using a Scheduler. For most use cases, the normal scheduler is fine - but if you want to try and tweak performance a bit more, using Real Time schedulers might get you there. In this lesson we learn a little about the different Real Time schedulers and how to manipulate processes using them.
Rather than having things mounted all the time, a service like AutoFS can mount network shares only when they're being used, and dismount them when they aren't. This lesson goes over configuring AutoFS.
Extending Virtual Disks (LVM/VDO)
One of the benefits of LVM is the fact that you can add space "on the fly" - that is, it is easy to add a new disk and then grow the area you can write data to. VDO also has this capability. In this lesson we go over how to do these tasks.
The conclusion to our video course. Thanks for sticking with me throughout.
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