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Systemd Cheat Sheet : Linux

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Systemd is becoming the default on most distros

Systemd is becoming the default in many distros, RHEL, CentOS, Ubuntu  and it offers a single command to manage your system, instead of switching between chkconfig or running init scripts.

Systemd Service Commands

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COMMAND DESCRIPTION
systemctl stop service-name systemd stop running service
systemctl start service-name systemctl start service
systemctl restart service-name systemd restart running service
systemctl reload service-name reloads all config files for service
systemctl status service-name systemctl show if service is running
systemctl enable service-name systemctl start service at boot
systemctrl disable service-name systemctl – disable service at boot
systemctl show service-name show systemctl service info
systemctl -H target command service-name run systemctl commands remotely

Systemd Information Commands

Systemd commands that show useful system information.

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COMMAND DESCRIPTION
systemctl list-dependencies show and units dependencies
systemctl list-sockets systemd list sockets and activities
systemctl list-jobs view active systemd jobs
systemctl list-unit-files systemctl list unit files and their states
systemctl list-units systemctl list default target (like run level)

Changing System State

systemd reboot, shutdown, default target etc

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COMMAND DESCRIPTION
systemctl reboot systemctl reboot the system
systemctl poweroff systemctl shutdown (power off the system)
systemctl emergency Put in emergency mode
systemctl default systemctl default mode

##Systemctl Viewing Log Messages

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COMMAND DESCRIPTION
journalctl show all collected log messages
journalctl -u sshd.service see sshd service messages
journelctl -f follow messages as they appear
journelctl -k show kernel messages only

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