helpful systemctl commands

systemctl.md

systemctl commands

systemctl enable # tell systemd to start service at boot

systemctl edit kubelet.service # or vi /etc/systemd/system/kubelet.service

systemctl daemon-reload

systemctl restart kubelet.service

systemctl status kubelet.service

If you change a systemd service file, systemctl daemon-reload. If the service was not started (eg. kubelet) systemctl enable kubelet; systemctl start kubelet

to see running processes

systemct

use systemctl to get list units that are active, add --all for everything

systemctl list-units

see all service units

systemctl list-units -at service

see filtered units (all running service)

systemctl list-units -t service --state running

see all service files, see which are enabled or disabled

systemctl list-unit-files -at service

use systemctl to list all units with specific status, inactive, active, enabled, running, exited

systemctl list-units --all --state=inactive

use systemctl to list all unit files

systemctl list-unit-files

see log items from the most recent boot

journalctl -b

to see only kernal messages, add -b for at the most recent boot

journalctl -k

to get the status of a service

systemctl status nginx.service

to get the log entries for a service since boot

journalctl -b -u nginx.service

check out the service file

systemctl cat nginx.service

list dependencies of a service, add --all to expand dependencies recursively

systemctl list-dependencies nginx.service

to see low level details of a service settings on the system

systemctl show nginx.service

reload or restart service

sudo systemctl reload-or-restart nginx.service

to check if the service is active, enabled or failed

systemctl is-active | is-enabled | is-failed nginx.service

if a node isn't working

systemctl to figure out what isn't running systemctl enable <service> systemctl start <whatever_isnt_working>