RH134 - ch04s08

In this lab, you will configure your system to purge files older than 5 days from /tmp. You will also add a new temporary directory called /run/gallifrey to be automatically created, with files which have been unused for more than 30 seconds being automatically purged.

Resources
Files:	`/etc/tmpfiles.d/` `/usr/lib/tmpfiles.d/tmp.conf`
Machines:	`serverX`

Outcomes:

A new temporary directory called /run/gallifrey, set up for automatic purging, and a modified purging configuration for /tmp.

Reset your serverX system.

In production, you have run into a number of issues:

/tmp is running out of disk space. It seems that allowing files to be unused for 10 days before they are deleted is too long for your site. You have determined that deleting files after five days of disuse is acceptable.
Your time-travel research daemon gallifrey needs a separate temporary directory called /run/gallifrey. Files in this directory should be purged automatically after they have been unused for 30 seconds. Only root should have read and write access to /run/gallifrey.

/tmp is under systemd-tmpfiles control. To override the upstream settings, copy /usr/lib/tmpfiles.d/tmp.conf to /etc/tmpfiles.d/.
1. ```
[student@serverX ~]$ sudo cp /usr/lib/tmpfiles.d/tmp.conf /etc/tmpfiles.d/
```
Find the line in /etc/tmpfiles.d/tmp.conf that controls the purging interval for /tmp, and change the interval from 10d to 5d.
1. Open /etc/tmpfiles.d/tmp.conf in an editor and make the change, or:
```
[student@serverX ~]$ sudo sed -i '/^d .tmp /s/10d/5d/' /etc/tmpfiles.d/tmp.conf 
```
Test if systemd-tmpfiles --clean accepts the new configuration.
```
[student@serverX ~]$ sudo systemd-tmpfiles --clean tmp.conf
```

Create a new configuration file /etc/tmpfiles.d/gallifrey.conf with the following content:

# Set up /run/gallifrey, owned by root with 0700 permissions
# Files not used for 30 seconds will be automatically deleted
d /run/gallifrey 0700 root root 30s

Test your new configuration for creating /run/gallifrey.

[student@serverX ~]$ sudo systemd-tmpfiles --create gallifrey.conf

[student@serverX ~]$ ls -ld /run/gallifrey
drwx------. 2 root root Feb 19  10:29 /run/gallifrey

Test the purging of your /run/gallifrey directory.
1. Create a new file under /run/gallifrey.
```
[student@serverX ~]$ sudo touch /run/gallifrey/companion
```
2. Wait for at least 30 seconds.
```
[student@serverX ~]$ sleep 30s
```
3. Have systemd-tmpfiles clean the /run/gallifrey directory.
```
[student@serverX ~]$ sudo systemd-tmpfiles --clean gallifrey.conf
```
4. Inspect the contents of /run/gallifrey.
```
[student@serverX ~]$ sudo ls -l /run/gallifrey
```

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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: rh134-7-c643331