Run Control Scripts

The Solaris software environment provides a detailed series of run control (rc) scripts to control run level changes. Each run level has an associated rc script located in the /sbin directory:

• rc0

• rc1

• rc2

• rc3

• rc5

• rc6

• rcS

For each rc script in the /sbin directory, there is a corresponding directory named /etc/rcn.d that contains scripts to perform various actions for that run level. For example, /etc/rc2.d contains files used to start and stop processes for run level 2.

# ls /etc/rc2.d
K07dmi             S70uucp            S75cron           S91afbinit
K07snmpdx          S71ldap.client     S75flashprom      S91ifbinit
K28nfs.server      S71rpc             S75savecore       S92volmgt
README             S71sysid.sys       S76nscd           S93cacheos.finish
S01MOUNTFSYS       S72autoinstall     S80PRESERVE       S94ncalogd
S05RMTMPFILES      S72inetsvc         S80lp             S95IIim
S20sysetup         S72slpd            S80spc            S95amiserv
S21perf            S73cachefs.daemon  S85power          S95ocfserv
S30sysid.net       S73nfs.client      S88sendmail       S99audit
S40llc2            S74autofs          S88utmpd          S99dtlogin
S47asppp           S74syslog          S89bdconfig
S69inet            S74xntpd           S90wbem

The /etc/rcn.d scripts are always run in ASCII sort order. The scripts have names of the form:

[KS][0-9][0-9]*

Files beginning with K are run to terminate (kill) a system process. Files beginning with S are run to start a system process.

Run control scripts are also located in the /etc/init.d directory. These files are linked to corresponding run control scripts in the /etc/rcn.d directories.

The actions of each run control script are summarized in Table 8-5.

Using a Run Control Script to Stop or Start Services

One advantage of having individual scripts for each run level is that you can run scripts in the /etc/init.d directory individually to turn off functionality without changing a system's run level.

How to Use a Run Control Script to Stop or Start a Service

1. Become superuser.

2. Turn off functionality.

   # /etc/init.d/filename stop

3. Restart functionality.

   # /etc/init.d/filename start

4. Use the pgrep command to verify whether the service has been stopped or started.

   # pgrep -f service

Example--Using a Run Control Script to Stop or Start a Service

Turn off NFS server functionality by typing:

# /etc/init.d/nfs.server stop
# pgrep -f nfs
#

Restart the NFS services by typing:

# /etc/init.d/nfs.server start
# pgrep -f nfs
141
143
245
247
# pgrep -f nfs -d, | xargs ps -fp
daemon   141     1 40   Jul 31 ?     0:00 /usr/lib/nfs/statd
root     143     1 80   Jul 31 ?     0:01 /usr/lib/nfs/lockd
root     245     1 34   Jul 31 ?     0:00 /usr/lib/nfs/nfsd -a 16
root     247     1 80   Jul 31 ?     0:02 /usr/lib/nfs/mountd

Adding a Run Control Script

If you want to add a run control script to start and stop a service, copy the script into the /etc/init.d directory and create links in the rcn.d directory you want the service to start and stop.

See the README file in each /etc/rcn.d directory for more information on naming run control scripts. The procedure below describes how to add a run control script.

How to Add a Run Control Script

1. Become superuser.

2. Add the script to the /etc/init.d directory.

   # cp filename /etc/init.d # chmod 0744 /etc/init.d/filename # chown root:sys /etc/init.d/filename

3. Create links to the appropriate rcn.d directory.

   # cd /etc/init.d # ln filename /etc/rc2.d/Snnfilename # ln filename /etc/rcn.d/Knnfilename

4. Use the ls command to verify that the script has links in the specified directories.

   # ls /etc/init.d/ /etc/rc2.d/ /etc/rcn.d/

Example--Adding a Run Control Script

# cp xyz /etc/init.d
# cd /etc/init.d
# ln xyz /etc/rc2.d/S100xyz
# ln xyz /etc/rc0.d/K100xyz
# ls /etc/init.d /etc/rc2.d /etc/rc0.d

Disabling a Run Control Script

Disable a run control script by renaming it with a dot (.) at the beginning of the new file name. Files that begin with a dot are not executed. If you copy a file by adding a suffix to it, both files will be run.

How to Disable a Run Control Script

1. Become superuser.

2. Rename the script by adding an underscore (_) to the beginning of the new file.

   # cd /etc/rcn.d # mv filename _filename

3. Verify the script has been renamed.

   # ls # _filename

Example--Disabling a Run Control Script

The following example changes the S100datainit script name but saves the original script.

# cd /etc/rc2.d
# mv S100datainit _S100datainit