RH134 - ch06s02

Preface A: Introduction

Section A.1: Red Hat System Administration II

Section A.2: Orientation to the Classroom Environment

Section A.3: Performing Lab Exercises

Chapter 1: Improve Command-line Productivity

Section 1.1: Write Simple Bash Scripts

Section 1.2: Guided Exercise: Write Simple Bash Scripts

Section 1.3: Loops and Conditional Constructs in Scripts

Section 1.4: Guided Exercise: Loops and Conditional Constructs in Scripts

Section 1.5: Match Text in Command Output with Regular Expressions

Section 1.6: Guided Exercise: Match Text in Command Output with Regular Expressions

Section 1.7: Lab: Improve Command-line Productivity

Section 1.8: Summary

Chapter 2: Schedule Future Tasks

Section 2.1: Schedule a Deferred User Job

Section 2.2: Guided Exercise: Schedule a Deferred User Job

Section 2.3: Schedule Recurring User Jobs

Section 2.4: Guided Exercise: Schedule Recurring User Jobs

Section 2.5: Schedule Recurring System Jobs

Section 2.6: Guided Exercise: Schedule Recurring System Jobs

Section 2.7: Manage Temporary Files

Section 2.8: Guided Exercise: Manage Temporary Files

Section 2.9: Quiz: Schedule Future Tasks

Section 2.10: Summary

Chapter 3: Analyze and Store Logs

Section 3.1: Describe System Log Architecture

Section 3.2: Quiz: Describe System Log Architecture

Section 3.3: Review Syslog Files

Section 3.4: Guided Exercise: Review Syslog Files

Section 3.5: Review System Journal Entries

Section 3.6: Guided Exercise: Review System Journal Entries

Section 3.7: Preserve the System Journal

Section 3.8: Guided Exercise: Preserve the System Journal

Section 3.9: Maintain Accurate Time

Section 3.10: Guided Exercise: Maintain Accurate Time

Section 3.11: Lab: Analyze and Store Logs

Section 3.12: Summary

Chapter 4: Archive and Transfer Files

Section 4.1: Manage Compressed tar Archives

Section 4.2: Guided Exercise: Manage Compressed tar Archives

Section 4.3: Transfer Files Between Systems Securely

Section 4.4: Guided Exercise: Transfer Files Between Systems Securely

Section 4.5: Synchronize Files Between Systems Securely

Section 4.6: Guided Exercise: Synchronize Files Between Systems Securely

Section 4.7: Lab: Archive and Transfer Files

Section 4.8: Summary

Chapter 5: Tune System Performance

Section 5.1: Adjust Tuning Profiles

Section 5.2: Guided Exercise: Adjust Tuning Profiles

Section 5.3: Influence Process Scheduling

Section 5.4: Guided Exercise: Influence Process Scheduling

Section 5.5: Lab: Tune System Performance

Section 5.6: Summary

Chapter 6: Manage SELinux Security

Section 6.1: Change the SELinux Enforcement Mode

SectionSection 6.2: Guided Exercise: Change the SELinux Enforcement Mode

Section 6.3: Control SELinux File Contexts

Section 6.4: Guided Exercise: Control SELinux File Contexts

Section 6.5: Adjust SELinux Policy with Booleans

Section 6.6: Guided Exercise: Adjust SELinux Policy with Booleans

Section 6.7: Investigate and Resolve SELinux Issues

Section 6.8: Guided Exercise: Investigate and Resolve SELinux Issues

Section 6.9: Lab: Manage SELinux Security

Section 6.10: Summary

Chapter 7: Manage Basic Storage

Section 7.1: Add Partitions, File Systems, and Persistent Mounts

Section 7.2: Guided Exercise: Add Partitions, File Systems, and Persistent Mounts

Section 7.3: Manage Swap Space

Section 7.4: Guided Exercise: Manage Swap Space

Section 7.5: Lab: Manage Basic Storage

Section 7.6: Summary

Chapter 8: Manage Storage Stack

Section 8.1: Create and Extend Logical Volumes

Section 8.2: Guided Exercise: Create and Extend Logical Volumes

Section 8.3: Manage Layered Storage

Section 8.4: Guided Exercise: Manage Layered Storage

Section 8.5: Lab: Manage Storage Stack

Section 8.6: Summary

Chapter 9: Access Network-Attached Storage

Section 9.1: Manage Network-Attached Storage with NFS

Section 9.2: Guided Exercise: Manage Network-Attached Storage with NFS

Section 9.3: Automount Network-Attached Storage

Section 9.4: Guided Exercise: Automount Network-Attached Storage

Section 9.5: Lab: Access Network-Attached Storage

Section 9.6: Summary

Chapter 10: Control the Boot Process

Section 10.1: Select the Boot Target

Section 10.2: Guided Exercise: Select the Boot Target

Section 10.3: Reset the Root Password

Section 10.4: Guided Exercise: Reset the Root Password

Section 10.5: Repair File-system Issues at Boot

Section 10.6: Guided Exercise: Repair File-system Issues at Boot

Section 10.7: Lab: Control the Boot Process

Section 10.8: Summary

Chapter 11: Manage Network Security

Section 11.1: Manage Server Firewalls

Section 11.2: Guided Exercise: Manage Server Firewalls

Section 11.3: Control SELinux Port Labeling

Section 11.4: Guided Exercise: Control SELinux Port Labeling

Section 11.5: Lab: Manage Network Security

Section 11.6: Summary

Chapter 12: Install Red Hat Enterprise Linux

Section 12.1: Install Red Hat Enterprise Linux

Section 12.2: Guided Exercise: Install Red Hat Enterprise Linux

Section 12.3: Automate Installation with Kickstart

Section 12.4: Guided Exercise: Automate Installation with Kickstart

Section 12.5: Install and Configure Virtual Machines

Section 12.6: Quiz: Install and Configure Virtual Machines

Section 12.7: Lab: Install Red Hat Enterprise Linux

Section 12.8: Summary

Chapter 13: Run Containers

Section 13.1: Container Concepts

Section 13.2: Quiz: Container Concepts

Section 13.3: Deploy Containers

Section 13.4: Guided Exercise: Deploy Containers

Section 13.5: Manage Container Storage and Network Resources

Section 13.6: Guided Exercise: Manage Container Storage and Network Resources

Section 13.7: Manage Containers as System Services

Section 13.8: Guided Exercise: Manage Containers as System Services

Section 13.9: Lab: Run Containers

Section 13.10: Summary

Chapter 14: Comprehensive Review

Section 14.1: Comprehensive Review

Section 14.2: Lab: Fix Boot Issues and Maintain Servers

Section 14.3: Lab: Configure and Manage File Systems and Storage

Section 14.4: Lab: Configure and Manage Server Security

Section 14.5: Lab: Run Containers

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Guided Exercise: Change the SELinux Enforcement Mode

In this lab, you manage SELinux modes, both temporarily and persistently.

Outcomes

View and set the current SELinux mode.

As the student user on the workstation machine, use the lab command to prepare your system for this exercise.

This command prepares your environment and ensures that all required resources are available.

[student@workstation ~]$ lab start selinux-opsmode

Instructions

On the workstation machine, use the ssh command to log in to the servera machine as the student user and then switch to the root user.

[student@workstation ~]$ ssh student@servera
...output omitted...
[student@servera ~]$ sudo -i
[sudo] password for student: student
[root@servera ~]#

Change the default SELinux mode to permissive.
1. Use the getenforce command to verify the current SELinux mode on the servera machine.
```
[root@servera ~]# getenforce
Enforcing
```
2. Use the vim /etc/selinux/config command to edit the configuration file. Change the SELINUX parameter from enforcing to permissive mode.
```
[root@servera ~]# vim /etc/selinux/config
```
3. Use the grep command to confirm that the SELINUX parameter displays the permissive mode.
```
[root@servera ~]# grep '^SELINUX' /etc/selinux/config
SELINUX=permissive
SELINUXTYPE=targeted
```
4. Use the setenforce command to change the SELINUX parameter to the permissive mode and verify the change.
```
[root@servera ~]# setenforce 0
[root@servera ~]# getenforce
Permissive
```
Change the default SELinux mode back to the enforcing mode in the configuration file.
1. Use the vim /etc/selinux/config command to edit the configuration file. Change the SELINUX parameter from permissive to enforcing mode.
```
[root@servera ~]# vim /etc/selinux/config
```
2. Use the grep command to confirm that the SELINUX parameter sets the enforcing mode on booting.
```
[root@servera ~]# grep '^SELINUX' /etc/selinux/config
SELINUX=enforcing
SELINUXTYPE=targeted
```

Set the SELinux mode to enforcing on the command line. Reboot the servera machine and verify the SELinux mode.

Use the setenforce command to set the current SELinux mode to the enforcing mode. Use the getenforce command to confirm that SELinux is set to the enforcing mode.
```
[root@servera ~]# setenforce 1
[root@servera ~]# getenforce
Enforcing
```

Reboot the servera machine to implement the persistent configuration.

[root@servera ~]# systemctl reboot
Connection to servera closed by remote host.
Connection to servera closed.
[student@workstation ~]$

[student@workstation ~]$ ssh student@servera
...output omitted...
[student@servera ~]$ sudo -i
[sudo] password for student: student
[root@servera ~]# getenforce
Enforcing

Return to the workstation machine as the student user.

[root@servera ~]# exit
logout
[student@servera ~]$ exit
logout
Connection to servera closed.
[student@workstation ~]$

Finish

On the workstation machine, change to the student user home directory and use the lab command to complete this exercise. This step is important to ensure that resources from previous exercises do not impact upcoming exercises.

[student@workstation ~]$ lab finish selinux-opsmode

This concludes the section.

Discuss Red Hat System Administration II

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Is It possible to reset root password when the system is on multi-user.target?

jennifer1987

27 lip 2023

Hi thereWell, i have a question, Is It possible to reset root password when the system is on multi-user.target? I was not be able to found a foro o some information related with this and another question that I have, If the grub menu dont show up, is it posible to reset the root password?

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Red Hat System Administration II (RH134)

Haley_Ruccio

21 lip 2023

Build the skills to perform the key tasks needed to become a full-time Linux administratorRed Hat System Administration II (RH134) is the second part of the RHCSA training track for IT professionals who have already attended Red Hat System Administration I. The course goes deeper into core Linux system administration skills in storage configuration and management, installation and deployment of Red Hat Enterprise Linux, management of security features such as SELinux, control of recurring system tasks, management of the boot process and troubleshooting, basic system tuning, and command-line automation and productivity. This course assumes that students have attended Red Hat System Administration I (RH124).Experienced Linux administrators who seek rapid preparation for the RHCSA certification should instead start with RHCSA Rapid Track (RH199).This course is based on Red Hat Enterprise Linux 9.0.Course summaryInstall Red Hat Enterprise Linux using scalable methodsAccess security files, file systems, and networksExecute shell scripting and automation techniquesManage storage devices, logical volumes, and file systemsManage security and system accessControl the boot process and system servicesRun containersAudience for this courseThis course is geared toward Windows system administrators, network administrators, and other system administrators who are interested in supplementing current skills or backstopping other team members, in addition to Linux system administrators who are responsible for these tasks:Configuring, installing, upgrading, and maintaining Linux systems using established standards and proceduresProviding operational supportManaging systems for monitoring system performance and availabilityWriting and deploying scripts for task automation and system administrationRecommended trainingSuccessful completion of Red Hat System Administration I (RH124) is recommended.Experienced Linux administrators seeking to accelerate their path toward becoming a Red Hat Certified System Administrator should start with the RHCSA Rapid Track course (RH199).Take our free assessment to gauge whether this offering is the best fit for your skills.Technology considerationsThere are no special technology requirements.This course is not designed for bring your own device (BYOD).Internet access is not required, but is recommended to allow students to research and access Red Hat online resources.

Welcome to the Red Hat System Administration II (RH134) group in the Red Hat Learning Community!

Deanna

18 lip 2023

We are excited to launch a space dedicated to the Red Hat Training course Red Hat System Administration II! To gain the most value from this group - click the "Join Group" button in the upper right hand corner.We encourage group members to collaborate in this group to discuss topics, ask questions, share best practices and tips, provide course feedback, and share their accomplishments as it relates to RH134.Read more about Red Hat System Administration II here.

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Revision: rh134-9.0-fa57cbe