RH134 - ch10s07

On workstation, run the lab boot-review start command. This command runs a start script that determines if the serverb machine is reachable on the network. It also introduces a file-system issue, resets the root password, sets a higher timeout for the GRUB2 menu, and reboots serverb.

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

On serverb, reset the root password to redhat.
Locate the icon for the serverb console, as appropriate for your classroom environment. Work from that console.
Send a Ctrl+Alt+Del to your system using the relevant button or menu entry.
When the boot-loader menu appears, press any key to interrupt the countdown, except Enter.
Use the cursor keys to highlight the default boot loader entry.
Press e to edit the current entry.
Use the cursor keys to navigate to the line that starts with linux.
Press End to move the cursor to the end of the line.
Append rd.break to the end of the line.
Press Ctrl+x to boot using the modified configuration.
At the switch_root prompt, remount the /sysroot file system read/write, then use chroot to go into a chroot jail at /sysroot.
switch_root:/# mount -o remount,rw /sysroot switch_root:/# chroot /sysroot
Set the root password to redhat.
sh-4.4# 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 relabel after boot.
sh-4.4# touch /.autorelabel
Type exit twice to continue booting your system. The system fails to boot because of an issue you resolve in the next step.
The system fails to boot. A start job does not seem to complete. From the console, fix the issue.
Boot the system into emergency mode. To do so, reboot serverb by sending a Ctrl+Alt+Del to your system using the relevant button or menu entry.
When the boot-loader menu appears, press any key to interrupt the countdown, except Enter.
Use the cursor keys to highlight the default boot loader entry.
Press e to edit the current entry.
Use the cursor keys to navigate to the line that starts with linux.
Press End to move the cursor to the end of the line.
Append systemd.unit=emergency.target to the end of the line.
Press Ctrl+x to boot using the modified configuration.
Log in to emergency mode. The root password is redhat.
Give root password for maintenance (or press Control-D to continue): redhat [root@serverb ~]#
Remount the / file system read/write.
[root@serverb ~]# mount -o remount,rw /
Use the mount -a command to attempt to mount all the other file systems.
[root@serverb ~]# mount -a mount: /olddata: can't find UUID=4d5c85a5-8921-4a06-8aff-80567e9689bc.
Edit /etc/fstab to remove or comment out the incorrect line.
[root@serverb ~]# vim /etc/fstab ...output omitted... #UUID=4d5c85a5-8921-4a06-8aff-80567e9689bc /olddata xfs defaults 0 0
Update systemd for the system to register the new /etc/fstab configuration.
[root@serverb ~]# systemctl daemon-reload [root@serverb ~]#
Verify that your /etc/fstab is now correct by attempting to mount all entries.
[root@serverb ~]# mount -a [root@serverb ~]#
Reboot the system and wait for the boot to complete. Because you created the /.autorelabel file in the first step, after setting the root password, the system runs an SELinux relabel, then reboots again by itself. The system should now boot normally.
[root@serverb ~]# systemctl reboot
Change the default systemd target on serverb for the system to automatically start a graphical interface when it boots.
No graphical interface is installed yet on serverb. For this exercise, only set the default target and do not install the packages.
Log in to serverb as the root user. Use redhat as the password.
Use the systemctl set-default command to set graphical.target as the default target.
[root@serverb ~]# systemctl set-default graphical.target
Use the systemctl get-default command to verify your work.
[root@serverb ~]# systemctl get-default graphical.target
Log off from serverb.
[root@serverb ~]# exit

Evaluation

On workstation, run the lab boot-review grade script to confirm success on this exercise.

[student@workstation ~]$ lab boot-review grade

Finish

On workstation, run the lab boot-review finish script to complete the lab.

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

This concludes the lab.

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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: rh134-8.2-f0a9756