Random bits of knowledge

Service Related Commands

Comments	SysV	Systemd
Start en service	service <navn> start	systemctl start <navn>.service
Stop en service	service <navn> stop	systemctl stop <navn>.service
Restarte en service	service <navn> restart	systemctl restart <navn>.service
Reload en service	service <navn> reload	systemctl reload <navn>.service
Service status	service <navn> status	systemctl status <navn>.service
Enable service at startup	chkconfig <navn> on	systemctl enable <navn>.service
Disable service at startup	chkconfig <navn> off	systemctl disable <navn>.service
Check om en service er enable at startup	chkconfig <navn>	systemctl is-enabled <navn>.service

Comments	SysV	Systemd
System halt	0	runlevel0.target, poweroff.target
Single user mode	1,s,single	runlevel1.target, rescue.target
Multi user	2	runlevel2.target, multi-user.target
Multi user med netværk	3	runlevel3.target, multi-user.target
Eksperimental	4	runlevel4.target, multi-user.target
Multi user med netværk og grafisk mode	5	runlevel5.target, graphical.target
Reboot	6	runlevel6.target, reboot.target
Emergency shell	emergency	emergency.target
Skift til multi user runlevel / target	init 3	systemctl isolate multi-user.target
Check current runlevel	runlevel	systemctl get-default
Change default runlevel	Ret i /etc/inittab	systemctl set-default multi-user.target

Comments	SysV	Systemd
System halt	halt	systemctl halt
Power off	poweroff	systemctl poweroff
Restart	reboot	systemctl reboot
Suspend	pm-suspend	systemctl suspend
Hilbernate	pm-hilbernate	systemctl hibernate
Follow system log file	tail -f /var/log/messages, tail -f /var/log/syslog	journalctl -f

Comments	Systemd
Kill processes related to a service	systemd kill <navn>
Get logs or events for today	journalctl –since=today
Check boot time	systemd-analyze <time>
Hostname m.m.	hostnamectl
Tid, dato, tidszone m.m.	timedatectl