RH134 - ch10s04

This command runs a start script that determines whether the servera machine is reachable on the network. It also resets the root password to a random string and sets a higher time-out for the GRUB2 menu.

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

Instructions

Reboot servera, and interrupt the countdown in the boot-loader menu.
1. Locate the icon for the servera console, as appropriate for your classroom environment, and then open the console.
  Send Ctrl+Alt+Del to your system by using the relevant button or menu entry.
2. When the boot-loader menu appears, press any key to interrupt the countdown, except Enter.
Edit the rescue kernel boot-loader entry, in memory, to abort the boot process just after the kernel mounts all the file systems, but before it hands over control to systemd.
1. Use the cursor keys to highlight the rescue kernel entry (the one with the rescue word in its name).
2. Press e to edit the current entry.
3. Use the cursor keys to navigate to the line that starts with linux.
4. Press End to move the cursor to the end of the line.
5. Append rd.break to the end of the line.
  Note
  If it is difficult for you to see the text in the console, then consider changing the resolution when editing the kernel line in the boot loader entry.
  To change the console resolution, add either video=640x480 or vga=ask on the line that starts with the linux word, after rd.break. For most consoles, a resolution of 640x480 is enough. By using vga=ask, you can choose a more suitable resolution for your environment.
6. Press Ctrl+x to boot by using the modified configuration.
Press Enter to perform maintenance. At the sh-5.1# prompt, remount the /sysroot file-system as read/write, and then use the chroot command to enter a chroot jail at /sysroot.
```
sh-5.1# mount -o remount,rw /sysroot
...output omitted...
sh-5.1# chroot /sysroot
```

Change the root password back to redhat.

sh-5.1# passwd root
Changing password for user root.
New password: redhat
BAD PASSWORD: The password is shorter than 8 characters
Retype new password: redhat
passwd: all authentication tokens updated successfully.

Configure the system to automatically perform a full SELinux relabeling after booting. This step is necessary because the passwd command re-creates the /etc/shadow file without an SELinux context.
```
sh-5.1# touch /.autorelabel
```
Type exit twice to continue booting your system as usual. The system runs an SELinux relabel operation, and then reboots automatically. When the system is up, verify your work by logging in as root at the console.

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 boot-resetting

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

Red Hat System Administration II

Guided Exercise: Reset the Root Password

Note