Managing services with `systemd` is a skill that modern Linux system administrators require to enable or disable processes to run as a service on the system. Being able to troubleshoot systemd services is invaluable for correct system operation. In this activity, you will learn about managing systemd services by troubleshooting why a oneshot systemd service is failing. Once this activity is complete, you should be comfortable managing `systemd` services with `systemctl`.
Learning Objectives
Successfully complete this lab by achieving the following learning objectives:
- Use systemctl to check the status of target.service. Update the systemd oneshot service unit file named target.service.
Using
systemctlcheck the status of thetarget.service.systemctl status target.service systemctl status -l target.serviceUsing the editor of your choice, update the
/etc/systemd/system/target.servicefile to match the following contents.[Unit] Description=Log when default target reached After=cloud-final.service [Service] Type=oneshot RemainAfterExit=yes ExecStart=/bin/echo "---> Reached default.target" ExecStart=/bin/ls -l /etc/systemd/system/default.target [Install] # WantedBy is similar to runlevel WantedBy=default.target- Reload the `systemd` daemon for updated unit file to be available. Check to see if service will start.
Use the
systemctlcommand to reload thesystemddaemon, so the new unit file can be managed.systemctl daemon-reloadUse the
systemctlcommand to start and check status of thetarget.service.systemctl start target.service systemctl status target.service- Enable the `target.service` and reboot system.
Using the
systemctlcommand enable thetarget.serviceand reboot the system to verify operation of service at boot time.systemctl enable target.service reboot- Reconnect to system and check the status of the `target.service`.
First, you will need to use your lab credentials to reconnect to the system and access the root account. Then, use the
systemctlcommand to view the status of thetarget.service. It should show that thetarget.servicestarted correctly.sudo -i systemctl status target.service
