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Management commands cheatsheet.md

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🔧 Management commands cheatsheet

This document contains management commands that system administrators are likely to run repeatedly over the lifetime of the server nodes.

Schedule a command to run at a certain time

Classic Linux system administration guides point to the at command for this task, but systemd-run is a better alternative that does not require additional packages and daemon processes to work.

It is important to specify an absolute path to the command to run. Under the hood, systemd-run creates transient timer and service units, where the service unit has the ExecStart property set to the specified command.

$ sudo systemd-run --description='Scheduled kernel update reboot' --on-calendar='2023-06-01 03:50:00 UTC' /usr/sbin/reboot

View a game server terminal without opening additional SSH connections

When run as root, machinectl can be used to create a complete terminal login session for a given user, unlike with su or sudo, which do not trigger the startup of systemd user daemons.

$ sudo machinectl shell <USER>@ [ABSOLUTE PATH TO COMMAND] [PARAMETERS...]