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This is a document to help system administrators who need to understand what commands in systemd replace their old workflow in SysVinit. | This is a document to help system administrators who need to understand what commands in systemd replace their old workflow in SysVinit. | ||
== | == Services == | ||
{| | {| | ||
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| service httpd condrestart || systemctl reload-or-restart httpd.service OR systemctl condrestart httpd.service OR service httpd condrestart || when supported restarts if the service is already running. | | service httpd condrestart || systemctl reload-or-restart httpd.service OR systemctl condrestart httpd.service OR service httpd condrestart || when supported restarts if the service is already running. | ||
|- | |- | ||
|} | |} | ||
== Runlevels == | == Runlevels == | ||
runlevels are used with telinit and on the kernel command line in SystemVinit. | runlevels are used with telinit and on the kernel command line in SystemVinit. These traditional ways of switching runlevels still work with systemd, but additionally, the following can be used instead. | ||
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| 6 || || Reboot | | 6 || || Reboot | ||
|} | |||
Changing runlevels: | |||
{| | |||
!SystemVinit Command!!Systemd Command!!Notes | |||
|- | |||
| telinit 3 || systemctl isolate runlevel3.target OR telinit 3 || Change to multi-user run level. | |||
|- | |||
| sed s/^id:.*:initdefault:/id:3:initdefault:/ || ln -sf /lib/systemd/systemd/multi-user.target /etc/systemd/system/default.target || Set to use multi-user runlevel on next reboot. | |||
|} | |} | ||
Revision as of 20:32, 9 September 2010
This is a document to help system administrators who need to understand what commands in systemd replace their old workflow in SysVinit.
Services
| SystemVinit Command | Systemd Command | Notes |
|---|---|---|
| ls -al /etc/rc.d/init.d | systemctl --all --type=service | Used to list the services that can be started or stopped |
| chkconfig httpd --list | Used to list what levels this service is configured on or off | |
| chkconfig httpd --level 345 on | Turn the service on for the next reboot | |
| chkconfig httpd --level 345 off | Turn the service off for the next reboot | |
| service httpd start | systemctl start httpd.service OR service httpd start | Used to start a service (not reboot persistent) |
| service httpd stop | systemctl stop httpd.service OR service httpd stop | Used to stop a service (not reboot persistent) |
| service httpd restart | systemctl restart httpd.service OR service httpd restart | Used to stop and then start a service |
| service httpd reload | systemctl reload httpd.service OR service httpd reload | When supported, reloads the config file without interrupting pending operations. |
| service httpd condrestart | systemctl reload-or-restart httpd.service OR systemctl condrestart httpd.service OR service httpd condrestart | when supported restarts if the service is already running. |
Runlevels
runlevels are used with telinit and on the kernel command line in SystemVinit. These traditional ways of switching runlevels still work with systemd, but additionally, the following can be used instead.
| SystemVinit Runlevel | Systemd Target | Notes |
|---|---|---|
| 0 | Halt the system. | |
| 1, s, single, emergency | Single user mode. | |
| 2, 4 | User-defined/Site-specific runlevels. By default, identical to 3. | |
| 3 | runlevel3.target, multi-user.target | Multi-user, non-graphical. Users can usually login via multiple consoles or via the network. |
| 5 | runlevel5.target, graphical.target | Multi-user, graphical. Usually has all the services of runlevel 3 plus a graphical login. |
| 6 | Reboot |
Changing runlevels:
| SystemVinit Command | Systemd Command | Notes |
|---|---|---|
| telinit 3 | systemctl isolate runlevel3.target OR telinit 3 | Change to multi-user run level. |
| sed s/^id:.*:initdefault:/id:3:initdefault:/ | ln -sf /lib/systemd/systemd/multi-user.target /etc/systemd/system/default.target | Set to use multi-user runlevel on next reboot. |