Table of Contents
#Introduction
In this tutorial, I write about the Systemd cheat sheet useful in Linux. Systemd provides a system and service that runs at PID 1. It tracks logged-in users and runs containers and virtual machines and more.
Logs with systemd
| The content | Command Line |
| View all system logs | journalctl |
| List boot numbers | journalctl –list-boots |
| View logs for unit ssh | journalctl –unit ssh |
| View system logs from the most recent | journalctl -xe |
For example the picture below
Introspection with systemd
| The content | Command Line |
| show unit file settings | systemctl show sshd |
| Show contents of the unit file | systemctl cat sshd |
| Show whether the unit is active | systemctl is-active sshd |
| Show whether the unit has failed | systemctl is-failed sshd |
| Edit unit file configuration | sudo systemctl edit sshd |
| Restart daemon | sudo systemctl daemon-reload |
Services
| The content | Command Line |
| Start service nginx | systemctl start nginx |
| Stop service nginx | systemctl stop nginx |
| Show status of service nginx | systemctl status nginx |
| Start nginx now and at system startup | systemctl enable –now nginx |
| At system startup, start (enable) nginx | systemctl enable nginx |
| At system startup, do not start nginx | systemctl disable nginx |
| Show whether service nginx is enabled | systemctl is-enabled nginx |
| Prevent service from starting (mask) | systemctl mask nginx |
| Unmask service, allowing it to be started | systemctl unmask nginx |
| List all available services | systemctl list-unit-files –-type service |
For example as below
Targets (runlevels)
| The content | Command line |
| List all available targets | systemctl list-unit-files –-type target |
| Show dependencies of a target | systemctl list-dependencies nginx |
| Show default boot target | systemctl get-default |
| Boot to a text console | systemctl set-default multi-user |
| Boot to a graphical desktop | systemctl set-default graphical |
Conclusion
You have to use Systemd Cheat Sheet Useful in Linux.
This cheat sheet covers the basic systemd commands, but there are many more advanced features and options available. You can refer to the systemd documentation or man pages (man systemctl) for more detailed information about specific commands or options.
I hope will this your helpful. Thank you for reading the DevopsRoles page!
