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RH124 Red Hat System Administration I
The non-English versions of this course, RH124, are in pre-release; the final localized release will occur after thorough reviews
are completed.
videos
REDHAT.COM CUSTOMER PORTAL
online
learning
Certificate of Attendance
Previous Next
Previous Next
Introduction
Red Hat System Administration I
Red Hat System Administration I
(RH124) is designed for IT professionals without previous Linux system administration
experience. The course is intended to provide students with Linux administration "survival skills" by focusing on core
administration tasks.
Red Hat System Administration I
also provides a foundation for students planning to become full-time Linux
system administrators by introducing key command-line concepts and enterprise-level tools. These concepts are further
developed in the follow-on course,
Red Hat System Administration II
(RH134).
Course Objectives
Gain sufficient skill to perform core system administration tasks on Red Hat Enterprise Linux.
Build foundational skills needed by an RHCSA-certified Red Hat Enterprise Linux system administrator.
Audience
IT professionals across a broad range of disciplines who need to perform essential Linux administration tasks, including
installation, establishing network connectivity, managing physical storage and basic security administration.
Prerequisites
There are no formal prerequisites for this course; however, previous system administration experience on other operating
systems will be very beneficial.
RH124 Red Hat System Administration I
The non-English versions of this course, RH124, are in pre-release; the final localized release will occur after thorough reviews
are completed.
videos
REDHAT.COM CUSTOMER PORTAL
online
learning
Certificate of Attendance
Previous Next
Orientation to the Classroom Environment
Figure 0.1: Classroom environment
In this course, the main computer system used for hands-on learning activities is workstation . Two other machines are also used
by students for these activities: servera , and serverb . All three of these systems are in the lab.example.com DNS domain.
All student computer systems have a standard user account, student , which has the password student . The root password on
all student systems is redhat .
Table 1. Classroom Machines
Machine name IP addresses Role
bastion.lab.example.com 172.25.250.254
Gateway system to connect student private network to classroom server (must
always be running)
workstation.lab.example.com 172.25.250.9 Graphical workstation used for system administration
servera.lab.example.com 172.25.250.10 First server
serverb.lab.example.com 172.25.250.11 Second server
The primary function of bastion is that it acts as a router between the network that connects the student machines and the
classroom network. If bastion is down, other student machines will only be able to access systems on the individual student
network.
Several systems in the classroom provide supporting services. Two servers, content.example.com and materials.example.com ,
are sources for software and lab materials used in hands-on activities. Information on how to use these servers is provided in the
instructions for those activities. These are provided by the classroom.example.com virtual machine. Both classroom and
bastion should always be running for proper use of the lab environment.
Controlling Your Systems
Students are assigned remote computers in a Red Hat Online Learning classroom. They are accessed through a web application
hosted at rol.redhat.com. Students should log in to this site using their Red Hat Customer Portal user credentials.
Controlling the Virtual Machines
The virtual machines in your classroom environment are controlled through a web page. The state of each virtual machine in the
classroom is displayed on the page under the Online Lab tab.
Table 2. Machine States
Virtual Machine
State
Description
STARTING The virtual machine is in the process of booting.
STARTED The virtual machine is running and available (or, when booting, soon will be).
STOPPING The virtual machine is in the process of shutting down.
STOPPED
The virtual machine is completely shut down. Upon starting, the virtual machine boots into the same
state as when it was shut down (the disk will have been preserved).
PUBLISHING The initial creation of the virtual machine is being performed.
WAITING_TO_START The virtual machine is waiting for other virtual machines to start.
Depending on the state of a machine, a selection of the following actions is available.
Table 3. Classroom/Machine Actions
When logging on to servera or serverb you might see a message concerning the activation of cockpit . The
message can be ignored.
[student@workstation ~]$ ssh student@serverb
Warning: Permanently added 'serverb,172.25.250.11' (ECDSA) to the list of known hosts.
Activate the web console with: systemctl enable --now cockpit.socket
[student@serverb ~]$
NOTE
Course Bookmarks
Previous Next
Button or
Action
Description
PROVISION
LAB
Create the ROL classroom. Creates all of the virtual machines needed for the classroom and starts them. Can take
several minutes to complete.
DELETE
LAB
Delete the ROL classroom. Destroys all virtual machines in the classroom. Caution: Any work generated on
the disks is lost.
START LAB Start all virtual machines in the classroom.
SHUTDOWN
LAB
Stop all virtual machines in the classroom.
OPEN
CONSOLE
Open a new tab in the browser and connect to the console of the virtual machine. Students can log in directly to
the virtual machine and run commands. In most cases, students should log in to the workstation virtual machine
and use ssh to connect to the other virtual machines.
ACTION →
Start
Start (power on) the virtual machine.
ACTION →
Shutdown
Gracefully shut down the virtual machine, preserving the contents of its disk.
ACTION →
Power Off
Forcefully shut down the virtual machine, preserving the contents of its disk. This is equivalent to removing the
power from a physical machine.
ACTION →
Reset
Forcefully shut down the virtual machine and reset the disk to its initial state. Caution: Any work generated on
the disk is lost.
At the start of an exercise, if instructed to reset a single virtual machine node, click ACTION → Reset for only the specific virtual
machine.
At the start of an exercise, if instructed to reset all virtual machines, click ACTION → Reset
If you want to return the classroom environment to its original state at the start of the course, you can click DELETE LAB to
remove the entire classroom environment. After the lab has been deleted, you can click PROVISION LAB to provision a new set of
classroom systems.
The Autostop Timer
The Red Hat Online Learning enrollment entitles students to a certain amount of computer time. To help conserve allotted
computer time, the ROL classroom has an associated countdown timer, which shuts down the classroom environment when the
timer expires.
To adjust the timer, click MODIFY to display the New Autostop Time dialog box. Set the number of hours until the classroom
should automatically stop. Click ADJUST TIME to apply this change to the timer settings.
The DELETE LAB operation cannot be undone. Any work you have completed in the classroom environment up to
that point will be lost.
WARNING
rh124-8.0-1
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