Table of Contents

Tilbage til Sysadm

Systemd vs. SysV init

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

Runlevels

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

Diverse

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

Systemd kommandoer

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