SysVinit to Systemd Cheatsheet¶

this is taken from http://fedoraproject.org/wiki/SysVinit_to_Systemd_Cheatsheet

This is a document to help system administrators who need to understand what commands in systemd replace their old workflow in sysvinit. If you want general information on systemd, refer to systemd.

Note on service and chkconfig commands
The service and chkconfig commands will mostly continue to work as expected in the systemd world, this guide is how to use the native systemctl replacements.

Services¶

Note that all recent versions of systemctl assume the .service if left off. So, systemctl start frobozz.service is the same as systemctl start frobozz

Sysvinit Command	Systemd Command	Notes
service frobozz start	systemctl start frobozz.service	Used to start a service (not reboot persistent)
service frobozz stop	systemctl stop frobozz.service	Used to stop a service (not reboot persistent)
service frobozz restart	systemctl restart frobozz.service	Used to stop and then start a service
service frobozz reload	systemctl reload frobozz.service	When supported, reloads the config file without interrupting pending operations.
service frobozz condrestart	systemctl condrestart frobozz.service	Restarts if the service is already running.
service frobozz status	systemctl status frobozz.service	Tells whether a service is currently running.
ls /etc/rc.d/init.d/	systemctl list-unit-files --type=service	Used to list the services that can be started or stopped
chkconfig frobozz on	systemctl enable frobozz.service	Turn the service on, for start at next boot, or other trigger.
chkconfig frobozz off	systemctl disable frobozz.service	Turn the service off for the next reboot, or any other trigger.
chkconfig frobozz	systemctl is-enabled frobozz.service	Used to check whether a service is configured to start or not in the current environment.
chkconfig --list	systemctl list-unit-files --type=service	Print a table of services that lists which runlevels each is configured on or off
chkconfig frobozz --list	ls /etc/systemd/system/*.wants /frobozz.service	Used to list what levels this service is configured on or off
chkconfig frobozz --add	systemctl daemon-reload	Used when you create a new service file or modify any configuration

Note that all /sbin/service and /sbin/chkconfig lines listed above continue to work on systemd, and will be translated to native equivalents as necessary. The only exception is chkconfig --list.

Additional commands¶

In SysVinit, services can define arbitrary commands. Examples would be service iptables panic, or service httpd graceful. Native systemd services do not have this ability.

Any service that defines an additional command in this way would need to define some other, service-specific, way to accomplish this task when writing a native systemd service definition.
Check the package-specific release notes for any services that may have done this.

Runlevels/targets¶

Systemd has a concept of targets which serve a similar purpose as runlevels but act a little different. Each target is named instead of numbered and is intended to serve a specific purpose. Some targets are implemented by inheriting all of the services of another target and adding additional services to it. There are systemd targets that mimic the common sysvinit runlevels so you can still switch targets using the familiar telinit RUNLEVEL command. The runlevels that are assigned a specific purpose on vanilla Fedora installs; 0, 1, 3, 5, and 6; have a 1:1 mapping with a specific systemd target. Unfortunately, there's no good way to do the same for the user-defined runlevels like 2 and 4. If you make use of those it is suggested that you make a new named systemd target as /etc/systemd/system/$YOURTARGET that takes one of the existing runlevels as a base (you can look at /lib/systemd/system/graphical.target as an example), make a directory /etc/systemd/system/$YOURTARGET.wants, and then symlink the additional services that you want to enable into that directory. (The service unit files that you symlink live in /lib/systemd/system).

Sysvinit Runlevel	Systemd Target	Notes
0	poweroff.target	Halt the system.
1, s, single	rescue.target	Single user mode.
2, 4	runlevel2.target, runlevel4.target	User-defined/Site-specific runlevels. By default, identical to 3.
3	multi-user.target	Multi-user, non-graphical. Users can usually login via multiple consoles or via the network.
5	graphical.target	Multi-user, graphical. Usually has all the services of runlevel 3 plus a graphical login.
6	reboot.target	Reboot
emergency	emergency.target	Emergency shell

Changing runlevels:

Sysvinit Command	Systemd Command	Notes
telinit 3	systemctl isolate multi-user.target	Change to multi-user run level.
sed s/^id:.*:initdefault:/id:3:initdefault:/	ln -sf /lib/systemd/system/multi-user.target /etc/systemd/system/default.target	Set to use multi-user runlevel on next reboot.

get/set default runlevel:
systemctl get-default
systemctl set-default multi-user.target

Kernel Options:

The above systemd targets can be used when booting. At the GRUB menu, edit the selection to add systemd.unit=target as a kernel option where target is one of the above. (For example, rescue.target.)

Tip: the .target extention is optional. The systemd.unit=rescue kernel option works the same as systemd.unit=rescue.target.