The /etc/inittab File
/etc/inittab file plays a crucial role in the
For versions of Solaris prior to version 10, the
/etc/inittab was edited manually. Solaris 10+ manages
/etc/inittab through SMF.
The Solaris 10
inittab should not be edited directly
The default Solaris 10
inittab contains the following:
- ap::sysinit:/sbin/autopush -f /etc/iu.ap
- sp::sysinit:/sbin/soconfig -f /etc/sock2path
- smf::sysinit:/lib/svc/bin/svc.startd >/dev/msglog 2<>/dev/msglog
- p3:s1234:powerfail:/usr/sbin/shutdown -y -i5 -g0 >/dev/msglog 2<>/dev/...
The lines accomplish the following:
- Initializes Streams
- Configures socket transport providers
- Initializes SMF master restarter
- Describes a power fail shutdown
In particular, the
default keyword is not used any more in
Solaris 10. Instead, the default run level is determined within the
init process is started, it first sets environment
variables set in the
/etc/default/init file; by default, only
TIMEZONE is set. Then
init executes process
entries from the
inittab that have
set, and transfers control of the startup process to
Solaris 8 and 9
The line entries in the
inittab file have the following
Here the id is a two-character unique identifier,
runlevel indicates the run level involved, action
indicates how the process is to be run, and process
is the command to be executed.
At boot time, all entries with runlevel "sysinit" are run.
Once these processes are run, the system moves towards the
init level indicated by the "initdefault" line. For a default
inittab, the line is:
(This indicates a default runlevel of 3.)
By default, the first script run from the
/etc/bcheckrc, which checks the state of
the root and
/usr filesystems. The line controlling
this script has the following form:
fs::sysinit:/sbin/bcheckrc >/dev/console 2>&1 </dev/console
inittab also controls what happens at each
For example, the default entry for runlevel 2 is:
s2:23:wait:/sbin/rc2 >/dev/console 2>&1 </dev/console
The action field of each entry will contain one of the following
- powerfail: The system has received a "powerfail" signal.
- wait: Wait for the command to be completed before proceeding.
- respawn: Restart the command.
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