[CentOS] Add application to start at booting

Johan Scheepers johansche at telkomsa.net
Thu Nov 25 14:32:08 EST 2010


sheraznaz at yahoo.com wrote:
> This was recently answered in another thread
> 
> <Quote>
> 
> Re: [CentOS] best way to start and shutdown programs in CentOS?
> 
> On 24 November 2010 14:20, killscript <killscript at gmail.com> wrote:
>> Les Mikesell wrote:
>>> The RedHat/Centos way of doing things is to have init scripts in
>>> /etc/rc.d/init.d that take at least start, stop, and restart as arguments for
>>> each program that should start automatically.  Then for the runlevels where you
>>> want them to start you have a symlink where the name starts with S and the rest
>>> is a number to make it sort alphabetically into the order that things should
>>> start in /etc/rc?.d (where the ? is the runlevel).  Likewise add links starting
>>> with 'K' in the levels where the process should be stopped.    There is a
>>> convention for comments in the scripts so that 'checkconfig program on' can make
>>> the links for you.  Look through some of the other scripts to see how they work.
>> Sorry for the stupid question here, but does the /etc/initd./scriptname
>> file "know" about these symlinks because of a particular comment in there?
> Copied from the man file for chkconfig:
> 
> RUNLEVEL FILES
>        Each service which should be manageable by chkconfig needs two
> or more commented lines added to its  init.d  script.  The  first
>        line  tells chkconfig what runlevels the service should be
> started in by default, as well as the start and stop priority levels.
>        If the service should not, by default, be started in any
> runlevels, a - should be used in place of the runlevels list.  The
> sec-
>        ond line contains a description for the service, and may be
> extended across multiple lines with backslash continuation.
> 
>        For example, random.init has these three lines:
>        # chkconfig: 2345 20 80
>        # description: Saves and restores system entropy pool for \
>        #              higher quality random number generation.
>        This  says that the random script should be started in levels
> 2, 3, 4, and 5, that its start priority should be 20, and that its
>        stop priority should be 80.  You should be able to figure out
> what the description says; the \ causes the line to be  continued.
>        The extra space in front of the line is ignored.
> 
> Basically, create your file by taking one of the files as a sample and
> place it in /etc/init.d.
> For example, I've copied /etc/init.d/vncserver to /etc/init.d/sample and ran
> [root at hakan init.d]# chkconfig --add sample
> [root at hakan init.d]# chkconfig --list|grep sample
> sample          0:off   1:off   2:off   3:off   4:off   5:off   6:off
> 
> Now my sample is there but won't run at all but it's all there.
> [root at hakan init.d]# chkconfig sample on
> [root at hakan init.d]# chkconfig --list|grep sample
> sample          0:off   1:off   2:on    3:on    4:on    5:on    6:off
> 
> Now it's on for all of the levels in the comment included in the file.
> Nevertheless, I could have overriden that with the ckconfig --level
> <levels> <name> on command options to run on other levels.
> 
> [root at hakan etc]# find rc* -iname *sample*|sort
> rc.d/init.d/sample
> rc.d/rc0.d/K35sample
> rc.d/rc1.d/K35sample
> rc.d/rc2.d/S91sample
> rc.d/rc3.d/S91sample
> rc.d/rc4.d/S91sample
> rc.d/rc5.d/S91sample
> rc.d/rc6.d/K35sample
> 
> and the file comment looks like below which matches the above, startup
> priority is 91, kill priority is 35. It will run on all normal levels
> since it's not defined, excluding 1 (single user), 0 (shutdown) and 6
> (reboot).
> 
> # chkconfig: - 91 35
> 
> I better remove this sample from my startup :)

What I was looking for is this..

System -> Preferences -> More Preferences -> Sessions -> Startup 
Programs -> Add

Thanks
Johan


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