and starts services for the specified runlevel
first stops any services that are not in the
specified runlevel unless --no-stop is specified, then starts any services in
the runlevel and stacked runlevels added by
that are not currently started. If no
runlevel is specified, we use the current runlevel.
There are some special runlevels that you should be aware of:
- Brings up any system specific stuff such as
/dev, /proc and
optionally /sys for Linux based systems. It
also mounts /lib/rc/init.d as a ramdisk using
tmpfs where available unless / is mounted rw at boot.
/lib/rc/init.d to hold state information
about the services it runs. sysinit always runs when the host first starts
should not be run again.
- Generally the only services you should add to the boot
runlevel are those which deal with the mounting of filesystems, set the
initial state of attached peripherals and logging. Hotplugged services are
added to the boot runlevel by the system. All services in the boot and
sysinit runlevels are automatically included in all other runlevels except
for those listed here.
- Stops all services except for those in the sysinit
- Changes to the shutdown runlevel and then reboots the
- Changes to the shutdown runlevel and then halts the
You should not call any of these runlevels yourself. Instead you should use
and let them call these special