Fedora151_emd Secret table

With the release of Fedora15, systemd officially started to replace SysVinit. The Secret table in this article helps you easily transition from SysVinit to systemd. This document aims to help the system administrator understand the commands in systemd that can replace the original sysvinit workflow. For more information about systemd, see systemd. Note The 'service' and 'chkconfig' commands

With the release of Fedora 15, systemd officially started to replace SysVinit. The Secret table in this article helps you easily transition from SysVinit to systemd.

This document aims to help the system administrator understand the commands in systemd that can replace the original sysvinit workflow. For more information about systemd, see systemd.

Note that the 'service' and 'chkconfig' commands are still available in the systemd environment. This tutorial aims to show you how to use native systemctl alternatives.

Sysvinit command	Systemd command	Remarks
Service frobozz start	Systemctl start frobozz. service	Used to start a service (does not restart the existing one)
Service frobozz stop	Systemctl stop frobozz. service	It is used to stop a service (and does not restart the existing one ).
Service frobozz restart	Systemctl restart frobozz. service	Used to stop and start a service.
Service frobozz reload	Systemctl reload frobozz. service	If this feature is supported, reload the configuration file without interrupting the waiting operation.
Service frobozz condrestart	Systemctl condrestart frobozz. service	If the service is running, restart it.
Service frobozz status	Systemctl status frobozz. service	Report whether the service is running.
Ls/etc/rc. d/init. d/	Ls/lib/systemd/system/*. service/etc/systemd/system/*. service	List of services that can be started or stopped.
Chkconfig frobozz on	Systemctl enable frobozz. service	Set service to enable at next startup or when other triggering conditions are met
Chkconfig frobozz off	Systemctl disable frobozz. service	Set service to disabled at next startup or when other triggering conditions are met
Chkconfig frobozz	Systemctl is-enabled frobozz. service	Used to check whether a service is enabled or disabled in the current environment.
Chkconfig frobozz-list	Ls/etc/systemd/system/*. wants/frobozz. service	Used to list the running levels at which the service is enabled and disabled.
Chkconfig frobozz-add		No. There are no equivalent commands.

Note that all the/sbin/service and/sbin/chkconfig listed above can still work in the systemd environment and will be translated as native equivalent commands if necessary. The only exception is chkconfig-list.

Additional commands:

• In SysVinit, the service can define any command. For exampleService iptables panicOrService httpd graceful. Native systemd Service does not have this capability.
• When writing native systemd service configurations, any service that defines additional commands in this way needs to define other, service-specific methods to complete this task.
• Check the release logs of the software package to learn about services that may perform similar operations.

Running level/target:

Systemd introduces a conceptTargetIts usage is similar to the running level, but it runs differently. EveryTargetNaming by name instead of number serves a specific purpose. Which serve a similar purpose as runlevels but act a little different. EachTargetIs named instead of numbered and is intended to serve a specific purpose. SomeTargetBy inheriting anotherTargetThen add other additional services for implementation. There are also some systemdTargetSimulate the common sysvinit running level, so you can still use the familiartelinit RUNLEVELTo switchTarget. Run level 0, 1, 3, 5, and 6 on pure Fedora; with specificTargetThere is a ing between them. Unfortunately, similar conversions cannot be implemented for user-defined runtime Level 2 and Level 4. If you use these running levels, we recommend that you use/etc/systemd/system/$YOURTARGETCreate a new systemdTargetBased on an existing running level (you can view/lib/systemd/system/graphical.targetAs an example), create a directory/etc/systemd/system/$YOURTARGET.wantsAnd then symbolic links to the extra services you want to enable to this directory (the services you symbolic links are located in/lib/systemd/system).

Sysvinit running level	Objective of systemd	Remarks
0	Runlevel0.target, poweroff.tar get	Shut down the system.
1, s, single	Runlevel1.target, rescue.tar get	Single User mode.
2, 4	Runlevel2.target, runlevel4.target, multi-user.target	User-Defined/specific domain running level. The default value is 3.
3	Runlevel3.target, multi-user.target	Multi-user, non-graphical. You can log on through multiple consoles or networks.
5	Runlevel5.target, graphical.tar get	Multi-user, graphical. Generally, all running level 3 services are added with graphical logon.
6	Runlevel6.target, reboot.tar get	Restart
Emergency	Emergency.tar get	Emergency Shell

Change the running level:

Sysvinit command	Systemd command	Remarks
Telinit 3	Systemctl isolate multi-user.target (OR systemctl isolate runlevel3.target OR telinit 3)	Change to multi-user running level.
Sed s/^ id:. *: initdefault:/id: 3: initdefault :/	Ln-sf/lib/systemd/system/multi-user.target/etc/systemd/system/default.tar get	Set the multi-user running level for the next startup.