init Rosetta

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Revision as of 21:08, 9 November 2012 by Sudokode (Talk | contribs) (lowercase title)

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This article draws a parallel between the old SysVinit and the current systemd initialization.

Keep in mind that you can always omit the .service and .target extensions, especially if you're temporarily editing the kernel parameters when bootloader menu shows up. Easier to remember, as well.

Commands

SysVinit systemd Information
 rc.d {start | stop | restart} daemon   systemctl {start | stop | restart} daemon.service  Change service state.
 rc.d list   systemctl list-unit-files --type=service  List Services.
 chkconfig daemon {on | off}   systemctl {enable | disable} daemon.service  Turn service on or off.
 chkconfig daemon --add   systemctl daemon-reload  Use when you create or modify configs/scripts.

Targets table

SysV Runlevel systemd Target Notes
0 runlevel0.target, poweroff.target Halt the system.
1, s, single runlevel1.target, rescue.target Single user mode.
2, 4 runlevel2.target, runlevel4.target, multi-user.target 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 runlevel6.target, reboot.target Reboot
emergency emergency.target Emergency shell