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
| 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.
| 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
| 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
| 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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