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Systemd ​

bootctl ​

bash
bootctl status
bootctl status --esp-path /mnt/lfs/boot/

hostnamectl ​

bash
hostnamectl status
hostnamectl set-hostname east-web-x

journalctl ​

bash
# specified date log
-S --since
-U --until
journalctl --since "2024-01-01"
journalctl --since "2024-01-01 09:00:00" --until "2024-01-01 09:15:00"
journalctl --since "20 min ago" --until "10 min ago"

# boot log
-b --boot [-0]

# kernel log
-k --dmesg

# unit log
-u --unit UNIT

# priority log
-p [debug|info|notice|warning|err|crit|alert|emerg]

# Immediately jump to the end in the pager
-e --pager-end

# number of journal entries to show and follow log
-f --follow
-n --lines 10

# Show the newest entries first
-r --reverse

# Change journal output mode
-o --output=STRING

# Add message explanations where available
-x --catalog

# specified pid log
journalctl _PID=123


# common
journalctl -xe -u nginx.service -u httpd.service -n 10 -f

localectl ​

bash
localectl status
localectl list-locales
localectl set-locale LANG=en_US.UTF-8

loginctl ​

bash
loginctl list-sessions
session-status

loginctl list-users
loginctl user-status
loginctl show-user root

networkctl ​

bash
networkctl list
networkctl status

timedatectl ​

bash
timedatectl status
timedatectl list-timezones

timedatectl set-time YYYY-MM-DD
timedatectl set-time HH:MM:SS
timedatectl set-timezone Asia/Hong_Kong

systemd-analyze ​

bash
systemd-analyze
systemd-analyze blame
systemd-analyze critical-chain

systemctl ​

bash
# Unit Commands
systemctl list-units
systemctl cat|start|stop|reload|restart|kill|is-active nginx.service
systemctl list-dependencies nginx.service
systemctl list-dependencies multi-user.target
systemctl isolate multi-user.target
# show value or set the specified properties of a Unit
systemctl show nginx.service
systemctl show -p CPUShares nginx.service
systemctl set-property nginx.service CPUShares=500

# Unit File Commands
systemctl list-unit-files
systemctl enable|is-enabled|disable|mask|unmask nginx.service
systemctl get-default
systemctl set-default multi-user.target

# Manager State Commands
systemctl daemon-reload|daemon-reexec
systemctl log-level|log-target

# System Commands
systemctl rescue
systemctl halt
systemctl poweroff
systemctl reboot [ARG]
systemctl suspend

# Other Commands
systemctl list-machines
systemctl list-jobs
systemctl show-environment
systemctl set-environment VARIABLE=VALUE

Reference:

  1. Systemd 入门教程