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Systemd Cheatsheet

Service Management

Command	Description
`systemctl start svc`	Start service
`systemctl stop svc`	Stop service
`systemctl restart svc`	Restart service
`systemctl reload svc`	Reload config
`systemctl enable svc`	Enable at boot
`systemctl disable svc`	Disable at boot
`systemctl enable --now svc`	Enable + start
`systemctl status svc`	Service status
`systemctl is-active svc`	Check if running
`systemctl is-enabled svc`	Check if enabled
`systemctl mask svc`	Prevent starting
`systemctl unmask svc`	Allow starting

Listing

Command	Description
`systemctl list-units --type=service`	Running services
`systemctl list-units --type=service --all`	All services
`systemctl list-unit-files`	All unit files
`systemctl --failed`	Failed services
`systemctl list-timers`	Active timers

Unit Files

Command	Description
`systemctl cat svc`	View unit file
`systemctl show svc`	All properties
`systemctl edit svc`	Create override
`systemctl edit --full svc`	Edit full file
`systemctl daemon-reload`	Reload unit files

Logs (journalctl)

Command	Description
`journalctl`	All logs
`journalctl -f`	Follow (live)
`journalctl -u svc`	Service logs
`journalctl -u svc -f`	Follow service
`journalctl -b`	Current boot
`journalctl -b -1`	Previous boot
`journalctl --since "1h ago"`	Last hour
`journalctl --since today`	Today
`journalctl -p err`	Errors only
`journalctl -k`	Kernel messages
`journalctl -xe`	Recent + explanations
`journalctl --disk-usage`	Log disk usage
`journalctl --vacuum-size=500M`	Trim logs

Targets

Command	Description
`systemctl get-default`	Default target
`systemctl set-default multi-user.target`	Boot to CLI
`systemctl set-default graphical.target`	Boot to GUI
`systemctl isolate rescue.target`	Rescue mode

System Control

Command	Description
`systemctl reboot`	Reboot
`systemctl poweroff`	Shutdown
`systemctl suspend`	Suspend
`systemctl hibernate`	Hibernate
`hostnamectl set-hostname name`	Set hostname
`timedatectl set-timezone Zone`	Set timezone

Resource Control

Property	Description
`CPUQuota=50%`	CPU limit
`MemoryMax=512M`	Memory limit
`TasksMax=100`	Process limit
`IOWeight=100`	I/O priority
`systemd-cgtop`	cgroup resource viewer

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