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Solaris Run Levels

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Solaris init states refer to the level of services provided by the system. The exact services and processes run at each init level are determined by the scripts in the /etc/rc#.d directories. The default service levels for each init state are listed below:

The init states are defined in the /etc/inittab file, which usually points at the scripts in /sbin/rcrun-level. These scripts in turn examine the contents of the /etc/rcrun-level directories. The scripts in these directories whose names begin with the letter K are run in "stop" mode first in alphabetical order. Then the scripts whose names begin with the letter S are run in "start" mode in alphabetical order.

To get to a desired run level n, each of the rc (run control) scripts from 1 to n is run. To get to run level 0, the K scripts are run in each rc#.d directory between the current run level and 0 in reverse numerical order.

In the default configuration, the rc scripts accomplish the following tasks:

Solaris Run level change

I need to find out runlevel related information, as you may need to change runlevel for following causes:
  1. Halt/reboot system when shutdown command donít work
  2. Troubleshooting or repairing system
The first thing I noticed was /etc/inittab file is different from the Linux version. However, runlevel are quite identical

Default Solaris Run Level Solaris Find out runlevel

To find out current runlevel use who command:

$ who -r

Output:
  .       run-level 3  Mar  3 14:04     3      0  S
Solaris changing runlevels after bootup

You need to use init command, for example change runlevel to 2.

# /sbin/init 2

Solaris changing the default runlevel

An entry with initdefault (in /etc/inittab file) is scanned only when init is initially invoked. init uses this entry to determine which run level to enter initially.

Open /etc/inittab file:

# vi /etc/inittab

Find out this entry:

is:3:initdefault:

Change is:3 to number you want, don't use S, 0, 6 ;). Save file.

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Last modified: April 18, 2018