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 stop system services without changing a system's run level.

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

1. Become superuser.

2. Stop the system service.

   # /etc/init.d/filename stop

3. Restart the system service.

   # /etc/init.d/filename start

4. Verify that the service has been stopped or started.

   # pgrep -f service

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

For example, you can stop the NFS server daemons by typing the following:

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

Then, you can restart the NFS server daemons by typing the following:

# /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. Then, create links in the rcn.d directory where 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 following procedure 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. 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

The following example shows how to add a run control script for the xyz service.

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

You can disable a run control script by renaming it with an underscore (_) at the beginning of the file name. Files that begin with an underscore or 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 that the script has been renamed.

   # ls _* # _filename

Example--Disabling a Run Control Script

The following example shows how to rename the S100datainit script.

# cd /etc/rc2.d
# mv S100datainit _S100datainit
# ls _*
# _S100datainit