Systemd is the default init system for modern Linux systems, as of:

• Debian 8 (Jessie)
• Fedora 15
• RHEL/CentOS 7
• Ubuntu 15.04

List all services

systemctl list-unit-files --type=service

Service start/stop/status

systemctl start/stop/status servicename.service

Ex:

systemctl status sshd.service

Enable/disable service at boot

systemctl enable/disable servicename.service

Ex:

systemctl enable sshd.service

Check if service is enabled at boot

systemctl is-enabled servicename.service

Ex:

systemctl is-enabled sshd.service

Change default runlevel

• No GUI, multiple users (RHEL old runlevel 3)

    systemctl set-default multi-user.target
  

• GUI (RHEL old runlevel 5, Debian/Ubuntu old runlevel 2-5)

    systemctl set-default graphical.target