RH134 - ch06s04

On workstation, run the lab storage-swap start command. This command runs a start script that determines if the servera machine is reachable on the network. It also prepares the second disk on servera for the exercise.

[student@workstation ~]$ lab storage-swap start

Use the ssh command to log in to servera as the student user. The systems are configured to use SSH keys for authentication, therefore a password is not required.
```
[student@workstation ~]$ ssh student@servera
...output omitted...
[student@servera ~]$ 
```
Use the sudo -i command to switch to the root user. If prompted, use student as the password.
```
[student@servera ~]$ sudo -i
[sudo] password for student: student
[root@servera ~]# 
```

Use the parted command to inspect the /dev/vdb disk.

[root@servera ~]# parted /dev/vdb print
Model: Virtio Block Device (virtblk)
Disk /dev/vdb: 5369MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system  Name  Flags
 1      1049kB  1001MB  1000MB               data

Notice that the disk already has a partition table and uses the GPT partitioning scheme. Also, a 1 GB partition already exists.

Add a new partition that is 500 MB in size for use as swap space. Set the partition type to linux-swap.
1. Use parted to create the partition. Because the disk uses the GPT partitioning scheme, you need to give a name to the partition. Call it myswap.
```
[root@servera ~]# parted /dev/vdb mkpart myswap linux-swap \
1001MB 1501MB
Information: You may need to update /etc/fstab.
```
  Notice in the previous command that the start position, 1001 MB, is the end of the existing first partition. This way parted makes sure that the new partition immediately follows the previous one, without any gap.
  Because the partition starts at the 1001 MB position, the command sets the end position to 1501 MB to get a partition size of 500 MB.
2. Verify your work by listing the partitions on /dev/vdb.
```
[root@servera ~]# parted /dev/vdb print
Model: Virtio Block Device (virtblk)
Disk /dev/vdb: 5369MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system  Name   Flags
 1      1049kB  1001MB  1000MB               data
 2      1001MB  1501MB  499MB                myswap swap
```
  The size of the new partition is not exactly 500 MB. This is because parted has to align the partition with the disk layout.
3. Run the udevadm settle command. This command waits for the system to register the new partition and returns when it is done.
```
[root@servera ~]# udevadm settle
```

Initialize the newly created partition as swap space.

[root@servera ~]# mkswap /dev/vdb2
Setting up swapspace version 1, size = 476 MiB (499118080 bytes)
no label, UUID=cb7f71ca-ee82-430e-ad4b-7dda12632328

Enable the newly created swap space.
1. Use the swapon --show command to show that creating and initializing swap space does not yet enable it for use.
```
[root@servera ~]# swapon --show
```
2. Enable the newly created swap space.
```
[root@servera ~]# swapon /dev/vdb2
```
3. Verify that the newly created swap space is now available.
```
[root@servera ~]# swapon --show
NAME      TYPE      SIZE USED PRIO
/dev/vdb2 partition 476M   0B   -2
```
4. Disable the swap space.
```
[root@servera ~]# swapoff /dev/vdb2
```
5. Confirm that the swap space is disabled.
```
[root@servera ~]# swapon --show
```
Configure the new swap space to be enabled at system boot.
1. Use the lsblk command with the --fs option to discover the UUID of the /dev/vdb2 device.
```
[root@servera ~]# lsblk --fs /dev/vdb2
NAME FSTYPE LABEL UUID                                 MOUNTPOINT
vdb2 swap         cb7f71ca-ee82-430e-ad4b-7dda12632328
```
  The UUID in the previous output is probably different on your system.
2. Add an entry to /etc/fstab. In the following command, replace the UUID with the one you discovered from the previous step.
```
...output omitted...
UUID=cb7f71ca-ee82-430e-ad4b-7dda12632328  swap  swap  defaults  0 0
```
3. Update systemd for the system to register the new /etc/fstab configuration.
```
[root@servera ~]# systemctl daemon-reload
```
4. Enable the swap space using the entry just added to /etc/fstab.
```
[root@servera ~]# swapon -a
```
5. Verify that the new swap space is enabled.
```
[root@servera ~]# swapon --show
NAME      TYPE      SIZE USED PRIO
/dev/vdb2 partition 476M   0B   -2
```

Reboot servera. After the server has rebooted, log in and verify that the swap space is enabled. When done, log off from servera.

Reboot servera.

[root@servera ~]# systemctl reboot
Connection to servera closed by remote host.
Connection to servera closed.
[student@workstation ~]$

Wait a few minutes for servera to reboot and log in as the student user.

[student@workstation ~]$ ssh student@servera
...output omitted...
[student@servera ~]$

Verify that the swap space is enabled.

[root@servera ~]# swapon --show
NAME      TYPE      SIZE USED PRIO
/dev/vdb2 partition 476M   0B   -2

Log off from servera.

[student@servera ~]$ exit
logout
Connection to servera closed.
[student@workstation ~]$

Finish

On workstation, run the lab storage-swap finish script to complete this exercise.

[student@workstation ~]$ lab storage-swap 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