RH134 - ch10s02

Preface A: Introduction

Section A.1: Red Hat System Administration II

Section A.2: Orientation to the Classroom Environment

Section A.3: Internationalization

Chapter 1: Improving Command-line Productivity

Section 1.1: Writing Simple Bash Scripts

Section 1.2: Guided Exercise: Writing Simple Bash Scripts

Section 1.3: Running Commands More Efficiently Using Loops

Section 1.4: Guided Exercise: Running Commands More Efficiently Using Loops

Section 1.5: Matching Text in Command Output with Regular Expressions

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

Section 1.7: Lab: Improving Command-line Productivity

Section 1.8: Summary

Chapter 2: Scheduling Future Tasks

Section 2.1: Scheduling a Deferred User Job

Section 2.2: Guided Exercise: Scheduling a Deferred User Job

Section 2.3: Scheduling Recurring User Jobs

Section 2.4: Guided Exercise: Scheduling Recurring User Jobs

Section 2.5: Scheduling Recurring System Jobs

Section 2.6: Guided Exercise: Scheduling Recurring System Jobs

Section 2.7: Managing Temporary Files

Section 2.8: Guided Exercise: Managing Temporary Files

Section 2.9: Quiz: Scheduling Future Tasks

Section 2.10: Summary

Chapter 3: Tuning System Performance

Section 3.1: Adjusting Tuning Profiles

Section 3.2: Guided Exercise: Adjusting Tuning Profiles

Section 3.3: Influencing Process Scheduling

Section 3.4: Guided Exercise: Influencing Process Scheduling

Section 3.5: Lab: Tuning System Performance

Section 3.6: Summary

Chapter 4: Controlling Access to Files with ACLs

Section 4.1: Interpreting File ACLs

Section 4.2: Quiz: Interpreting File ACLs

Section 4.3: Securing Files with ACLs

Section 4.4: Guided Exercise: Securing Files with ACLs

Section 4.5: Lab: Controlling Access to Files with ACLs

Section 4.6: Summary

Chapter 5: Managing SELinux Security

Section 5.1: Changing the SELinux Enforcement Mode

Section 5.2: Guided Exercise: Changing the SELinux Enforcement Mode

Section 5.3: Controlling SELinux File Contexts

Section 5.4: Guided Exercise: Controlling SELinux File Contexts

Section 5.5: Adjusting SELinux Policy with Booleans

Section 5.6: Guided Exercise: Adjusting SELinux Policy with Booleans

Section 5.7: Investigating and Resolving SELinux Issues

Section 5.8: Guided Exercise: Investigating and Resolving SELinux Issues

Section 5.9: Lab: Managing SELinux Security

Section 5.10: Summary

Chapter 6: Managing Basic Storage

Section 6.1: Adding Partitions, File Systems, and Persistent Mounts

Section 6.2: Guided Exercise: Adding Partitions, File Systems, and Persistent Mounts

Section 6.3: Managing Swap Space

Section 6.4: Guided Exercise: Managing Swap Space

Section 6.5: Lab: Managing Basic Storage

Section 6.6: Summary

Chapter 7: Managing Logical Volumes

Section 7.1: Creating Logical Volumes

Section 7.2: Guided Exercise: Creating Logical Volumes

Section 7.3: Extending Logical Volumes

Section 7.4: Guided Exercise: Extending Logical Volumes

Section 7.5: Lab: Managing Logical Volumes

Section 7.6: Summary

Chapter 8: Implementing Advanced Storage Features

Section 8.1: Managing Layered Storage with Stratis

Section 8.2: Guided Exercise: Managing Layered Storage with Stratis

Section 8.3: Compressing and Deduplicating Storage with VDO

Section 8.4: Guided Exercise: Compressing and Deduplicating Storage with VDO

Section 8.5: Lab: Implementing Advanced Storage Features

Section 8.6: Summary

Chapter 9: Accessing Network-Attached Storage

Section 9.1: Mounting Network-Attached Storage with NFS

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

Section 9.3: Automounting Network-Attached Storage

Section 9.4: Guided Exercise: Automounting Network-Attached Storage

Section 9.5: Lab: Accessing Network-Attached Storage

Section 9.6: Summary

Chapter 10: Controlling the Boot Process

Section 10.1: Selecting the Boot Target

SectionSection 10.2: Guided Exercise: Selecting the Boot Target

Section 10.3: Resetting the Root Password

Section 10.4: Guided Exercise: Resetting the Root Password

Section 10.5: Repairing File System Issues at Boot

Section 10.6: Guided Exercise: Repairing File System Issues at Boot

Section 10.7: Lab: Controlling the Boot Process

Section 10.8: Summary

Chapter 11: Managing Network Security

Section 11.1: Managing Server Firewalls

Section 11.2: Guided Exercise: Managing Server Firewalls

Section 11.3: Controlling SELinux Port Labeling

Section 11.4: Guided Exercise: Controlling SELinux Port Labeling

Section 11.5: Lab: Managing Network Security

Section 11.6: Summary

Chapter 12: Installing Red Hat Enterprise Linux

Section 12.1: Installing Red Hat Enterprise Linux

Section 12.2: Guided Exercise: Installing Red Hat Enterprise Linux

Section 12.3: Automating Installation with Kickstart

Section 12.4: Guided Exercise: Automating Installation with Kickstart

Section 12.5: Installing and Configuring Virtual Machines

Section 12.6: Quiz: Installing and Configuring Virtual Machines

Section 12.7: Lab: Installing Red Hat Enterprise Linux

Section 12.8: Summary

Chapter 13: Running Containers

Section 13.1: Introducing Containers

Section 13.2: Quiz: Introducing Containers

Section 13.3: Running a Basic Container

Section 13.4: Guided Exercise: Running a Basic Container

Section 13.5: Finding and Managing Container Images

Section 13.6: Guided Exercise: Finding and Managing Container Images

Section 13.7: Performing Advanced Container Management

Section 13.8: Guided Exercise: Performing Advanced Container Management

Section 13.9: Attaching Persistent Storage to a Container

Section 13.10: Guided Exercise: Attaching Persistent Storage to a Container

Section 13.11: Managing Containers as Services

Section 13.12: Guided Exercise: Managing Containers as Services

Section 13.13: Lab: Running Containers

Section 13.14: Summary

Chapter 14: Comprehensive Review

Section 14.1: Comprehensive Review

Section 14.2: Lab: Fixing Boot Issues and Maintaining Servers

Section 14.3: Lab: Configuring and Managing File Systems and Storage

Section 14.4: Lab: Configuring and Managing Server Security

Section 14.5: Lab: Running Containers

Bookmark this page

P 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Guided Exercise: Selecting the Boot Target

In this exercise, you will determine the default target into which a system boots, and boot that system into other targets.

Outcomes

You should be able to update the system default target and use a temporary target from the boot loader.

On workstation, run the lab boot-selecting start command. This command runs a start script that prepares workstation for the exercise.

[student@workstation ~]$ lab boot-selecting start

On workstation, open a terminal and confirm that the default target is graphical.target.
```
[student@workstation ~]$ systemctl get-default
graphical.target
```
On workstation, switch to the multi-user target manually without rebooting. Use the sudo command and if prompted, use student as the password.
```
[student@workstation ~]$ sudo systemctl isolate multi-user.target
[sudo] password for student: student
```
Access a text-based console. Use the Ctrl+Alt+F1 key sequence using the relevant button or menu entry. Log in as root using redhat as the password.
Note
Reminder: If you are using the terminal through a webpage you can click the Show Keyboard icon under your web browser’s url bar and then to the right of the machine’s IP address.
```
workstation login: root
Password: redhat
[root@workstation ~]# 
```
Configure workstation to automatically boot into the multi-user target, and then reboot workstation to verify. When done, change the default systemd target back to the graphical target.
1. Use the systemctl set-default command to set the default target.
```
[root@workstation ~]# systemctl set-default multi-user.target
Removed /etc/systemd/system/default.target.
Created symlink /etc/systemd/system/default.target -> /usr/lib/systemd/system/multi-user.target.
```
2. Reboot workstation.
```
[root@workstation ~]# systemctl reboot
```
  Notice that after reboot the system presents a text-based console and not a graphical login anymore.
3. Log in as root using redhat as the password.
```
workstation login: root
Password: redhat
Last login: Thu Mar 28 14:50:53 on tty1
[root@workstation ~]# 
```
4. Set the default systemd target back to the graphical target.
```
[root@workstation ~]# systemctl set-default graphical.target
Removed /etc/systemd/system/default.target.
Created symlink /etc/systemd/system/default.target -> /usr/lib/systemd/system/graphical.target.
```
  This concludes the first part of the exercise where you practice setting the default systemd target.
In this second part of the exercise, you will practice using rescue mode to recover the system.
Access the boot loader by rebooting workstation again. From within the boot loader menu, boot into the rescue target.
1. Initiate the reboot.
```
[root@workstation ~]# systemctl reboot
```
2. When the boot loader menu appears, press any key to interrupt the countdown (except Enter, which would initiate a normal boot).
3. Use the cursor keys to highlight the default boot loader entry.
4. Press e to edit the current entry.
5. Using the cursor keys, navigate to the line that starts with linux.
6. Press End to move the cursor to the end of the line.
7. Append systemd.unit=rescue.target to the end of the line.
8. Press Ctrl+x to boot using the modified configuration.
9. Log in to rescue mode. The root password is redhat You may need to hit enter to get a clean prompt.
```
Give root password for maintenance
(or press Control-D to continue): redhat
[root@workstation ~]# 
```

Confirm that in rescue mode, the root file system is in read/write mode.

[root@workstation ~]# mount
...output omitted...
/dev/vda3 on / type xfs (rw,relatime,seclabel,attr2,inode64,noquota)
...output omitted...

Press Ctrl+d to continue with the boot process.
The system presents a graphical login. Log in as student using student as the password.

Finish

On workstation, run the lab boot-selecting finish script to complete this exercise.

[student@workstation ~]$ lab boot-selecting finish

This concludes the guided exercise.

Discuss Red Hat System Administration II

Go to community

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?

991

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.

417

Revision: rh134-8.2-f0a9756

Red Hat System Administration II

Guided Exercise: Selecting the Boot Target

Note