Red Hat System Administration II

On workstation, run the /tmp/rhcsa-break1 script.

[student@workstation ~]$ sh /tmp/rhcsa-break1

After the serverb machine boots, access the console and notice that the boot process stopped early. Consider a possible cause for this behavior.

1. Locate the icon for the serverb console, as appropriate for your classroom environment. Open the console and inspect the error. It might take a few seconds for the error to appear.

2. Press Ctrl+Alt+Del to reboot the serverb machine. When the boot-loader menu appears, press any key except Enter to interrupt the countdown.

3. Edit the default boot-loader entry, in memory, to log in to the emergency mode. Press e to edit the current entry.

4. Use the cursor keys to navigate to the line that starts with linux. Append systemd.unit=emergency.target.

5. Press Ctrl+x to boot with the modified configuration.

6. Log in to emergency mode. Use redhat as the root user's password.

   Give root password for maintenance
   (or press Control-D to continue): redhat
   [root@serverb ~]#

Remount the / file system with read and write capabilities. Use the mount -a command to try to mount all the other file systems.

1. Remount the / file system with read and write capabilities to edit the file system.

   [root@serverb ~]# mount -o remount,rw /

2. Try to mount all the other file systems. Notice that one of the file systems does not mount.

   [root@serverb ~]# mount -a
   ...output omitted...
   mount: /FakeMount: can't find UUID=fake.

3. Edit the /etc/fstab file to fix the issue. Remove or comment out the incorrect line.

   [root@serverb ~]# vi /etc/fstab
   ...output omitted...
   #UUID=fake     /FakeMount  xfs   defaults    0 0

4. Update the systemd daemon for the system to register the new /etc/fstab file configuration.

   [root@serverb ~]# systemctl daemon-reload
   [ 206.828912] systemd[1]: Reloading.

5. Verify that /etc/fstab file is now correct by attempting to mount all entries.

   [root@serverb ~]# mount -a

6. Reboot serverb and wait for the boot to complete. The system should now boot without errors.

   [root@serverb ~]# systemctl reboot

On workstation, run the /tmp/rhcsa-break2 script. Wait for the serverb machine to reboot before proceeding.

[student@workstation ~]$ sh /tmp/rhcsa-break2

On serverb, set the multi-user target as the current and default target.

1. Log in to serverb as the student user.

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

2. Determine the default target.

   [student@serverb ~]$ systemctl get-default
   graphical.target

3. Switch to the multi-user target.

   [student@serverb ~]$ sudo systemctl isolate multi-user.target
   [sudo] password for student: student

4. Set the multi-user target as the default target.

   [student@serverb ~]$ sudo systemctl set-default multi-user.target
   Removed /etc/systemd/system/default.target.
   Created symlink /etc/systemd/system/default.target -> /usr/lib/systemd/system/multi-user.target.

5. Reboot serverb and verify that the multi-user target is set as the default target.

   [student@serverb ~]$ sudo systemctl reboot
   Connection to serverb closed by remote host.
   Connection to serverb closed.
   [student@workstation ~]$

6. After the system reboots, open an SSH session to serverb as the student user. Verify that the multi-user target is set as the default target.

   [student@workstation ~]$ ssh student@serverb
   ...output omitted...
   [student@serverb ~]$ systemctl get-default
   multi-user.target

On serverb, schedule a recurring job as the student user that executes the /home/student/backup-home.sh script hourly between 7 PM and 9 PM on all days except Saturday and Sunday. Use the backup-home.sh script to schedule the recurring job. Download the backup script from http://materials.example.com/labs/backup-home.sh. Run the command as an executable.

1. On serverb, download the backup script from http://materials.example.com/labs/backup-home.sh. Use chmod to make the backup script executable.

   [student@serverb ~]$ wget http://materials.example.com/labs/backup-home.sh
   ...output omitted...
   [student@serverb ~]$ chmod +x backup-home.sh

2. Open the crontab file with the default text editor.

   [student@serverb ~]$ crontab -e

3. Edit the file to add the following line:

   0 19-21 * * Mon-Fri /home/student/backup-home.sh

   Save the changes and exit the editor.

4. Use the crontab -l command to list the scheduled recurring jobs.

   [student@serverb ~]$ crontab -l
   0 19-21 * * Mon-Fri /home/student/backup-home.sh

Reboot serverb and wait for the boot to complete before grading.

[student@serverb ~]$ sudo systemctl reboot
[sudo] password for student: student
Connection to serverb closed by remote host.
Connection to serverb closed.
[student@workstation ~]$