How OpenRC Works/etc/inittab Init needs a configuration file that specifies what actions need to be taken. This configuration file is /etc/inittab | sysinit init's first action is to mount all file systems. This is defined in the following line from /etc/inittab. si::sysinit:/sbin/openrc sysinit | bootwait init's second action is to execute all scripts that had symbolic links in /etc/runlevels/boot/. This is defined in the following line from /etc/inittab. rc::bootwait:/sbin/openrc boot | initdefault init checks its configuration file to see what runlevel it should run. To decide this, it reads the following line from /etc/inittab. id:3:initdefault: | runlevel In this casethe runlevel id is 3. Using this information, init checks what it must run to start runlevel 3. l3:3:wait:/sbin/openrc default . The line that defines level 3, again, uses the openrc script to start the services (now with argument default) | consoles init decides what virtual consoles it should activate and what commands need to be run at each console. c1:12345:respawn:/sbin/agetty 38400 tty1 linux c2:12345:respawn:/sbin/agetty 38400 tty2 linux c3:12345:respawn:/sbin/agetty 38400 tty3 linux c4:12345:respawn:/sbin/agetty 38400 tty4 linux c5:12345:respawn:/sbin/agetty 38400 tty5 linux c6:12345:respawn:/sbin/agetty 38400 tty6 linux
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| | Runlevelssysinit | shutdown | reboot | boot | default | nonetwork | single |
InitscriptsWorking with initscripts The scripts that the openrc process starts are called init scripts. Each script in /etc/init.d/ can be executed with the arguments start, stop, restart, zap, status, ineed, iuse, iwant, needsme, usesme, or wantsme. | Start a service /etc/init.d/postfix start | Stop a service, but not the services that depend on it /etc/init.d/postfix --nodeps stop | See what status a service has /etc/init.d/postfix status | Ask what dependencies the service has /etc/init.d/postfix ineed | Ask what services require the service /etc/init.d/postfix needsme |
| | Configuring services/etc/conf.d Every init script that can be configured has a file in /etc/conf.d/. For instance, the apache2 initscript (called /etc/init.d/apache2) has a configuration file called /etc/conf.d/apache2, which can contain the options to give to the Apache 2 server when it is started. Such a configuration file contains only variables. |
Replacing default runlevelReplace runlevel Add a new entry in the bootloader configuration for the desired runlevel. In that entry, add softlevel=desired as a boot parameter. |
Working with runlevelChange to nonetwork runlevel | rc nonetwork | Change to default runlevel | rc default | Change to shutdown runlevel | rc shutdown | Change to reboot runlevel | rc reboot | Show status info about runlevels | rc-status [runlevel] | Locate and run an OpenRC service | rc-service service cmd [...] | Adding services | rc-update add postfix default | Removing services | rc-update del postfix default | Showing services | rc-update show |
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