RH134 - ch01s07

On workstation, run the lab console-review start command. This command runs a start script that determines if the workstation, servera and serverb machines are reachable on the network. The script will alert you if they are not available. It also installs the vim-enhanced and util-linux packages if needed, configures sudo, and prepares the content of /var/log/secure on servera and serverb.

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

Create the /home/student/bin/bash-lab script file on workstation.
On workstation, create the /home/student/bin/ folder if needed.
[student@workstation ~]$ mkdir -p /home/student/bin
Use vim to create and edit the /home/student/bin/bash-lab script file.
[student@workstation ~]$ vim ~/bin/bash-lab
Insert the following text and save the file.
#!/bin/bash
Make your script file executable.
[student@workstation ~]$ chmod a+x ~/bin/bash-lab

Edit your newly created script file to comply with the following requested information from the servera and serverb hosts. The systems are configured to use SSH keys for authentication; a password is not required.

Command or file	Content requested
hostname -f	Get all the output.
echo "#####"	Get all the output.
lscpu	Get only the lines that start with the string `CPU`.
echo "#####"	Get all the output.
`/etc/selinux/config`	Ignore empty lines. Ignore lines starting with #.
echo "#####"	Get all the output.
`/var/log/secure`	Get all "Failed password" entries.
echo "#####"	Get all the output.

Save the required information to the new files /home/student/output-servera and /home/student/output-serverb.

Note

You can use sudo without requiring a password on the servera and serverb hosts. Remember to use a loop to simplify your script. You can also use multiple grep commands concatenated with the use of the pipe character (|).

Use vim to open and edit the /home/student/bin/bash-lab script file.
```
[student@workstation ~]$ vim ~/bin/bash-lab
```

Append the following lines in bold to the /home/student/bin/bash-lab script file.

Note

The following is an example of how you can achieve the requested script. In Bash scripting, you can take different approaches and obtain the same result.

#!/bin/bash
#
USR='student'
OUT='/home/student/output'
#
for SRV in servera serverb
  do
ssh ${USR}@${SRV} "hostname -f" > ${OUT}-${SRV}
echo "#####" >> ${OUT}-${SRV}
ssh ${USR}@${SRV} "lscpu | grep '^CPU'" >> ${OUT}-${SRV}
echo "#####" >> ${OUT}-${SRV}
ssh ${USR}@${SRV} "grep -v '^$' /etc/selinux/config|grep -v '^#'" >> ${OUT}-${SRV}
echo "#####" >> ${OUT}-${SRV}
ssh ${USR}@${SRV} "sudo grep 'Failed password' /var/log/secure" >> ${OUT}-${SRV}
echo "#####" >> ${OUT}-${SRV}
done

Execute the /home/student/bin/bash-lab script, and review the output content on workstation.

On workstation, execute the /home/student/bin/bash-lab script.
```
[student@workstation ~]$ bash-lab
```

Review the content of /home/student/output-servera and /home/student/output-serverb.

[student@workstation ~]$ cat /home/student/output-servera
servera.lab.example.com
#####
CPU op-mode(s):      32-bit, 64-bit
CPU(s):              2
CPU family:          21
CPU MHz:             2294.670
#####
SELINUX=enforcing
SELINUXTYPE=targeted
#####
Mar 21 22:30:28 servera sshd[3939]: Failed password for invalid user operator1 from 172.25.250.9 port 58382 ssh2
Mar 21 22:30:31 servera sshd[3951]: Failed password for invalid user sysadmin1 from 172.25.250.9 port 58384 ssh2
Mar 21 22:30:34 servera sshd[3953]: Failed password for invalid user manager1 from 172.25.250.9 port 58386 ssh2
#####

[student@workstation ~]$ cat /home/student/output-serverb
serverb.lab.example.com
#####
CPU op-mode(s):      32-bit, 64-bit
CPU(s):              2
CPU family:          6
CPU MHz:             2294.664
#####
SELINUX=enforcing
SELINUXTYPE=targeted
#####
Mar 21 22:30:37 serverb sshd[3883]: Failed password for invalid user operator1 from 172.25.250.9 port 39008 ssh2
Mar 21 22:30:39 serverb sshd[3891]: Failed password for invalid user sysadmin1 from 172.25.250.9 port 39010 ssh2
Mar 21 22:30:43 serverb sshd[3893]: Failed password for invalid user manager1 from 172.25.250.9 port 39012 ssh2
#####

Evaluation

On workstation, run the lab console-review grade command to confirm success of this exercise.

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

Finish

On workstation, run the lab console-review finish script to complete this exercise.

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

This concludes the lab.

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: rh134-8.2-f0a9756