[clug] init.d for chroot

[Michael Ellerman]

jm via linux <linux at lists.samba.org> writes:

> Due to a package clash between one version of a program used to support
> other hosts that has to run on this host and the one used to support
> this host I've set up a chrooted environment. I'm to the stage where I'm
> trying to start it from an init.d script - This is a CentOS 6 (yes, 6)
> box. The init.d script needs to start supervisord within the chroot
> which will then watch over the few processes that need to run chrooted
> for this to work. The problem here is that I can't work out how to get
> the pid of the chrooted process to record it later for the stop part of
> the script. I can't kill it be name via killproc as there is already a
> supervisord process on the host.
>
> The the key parts of the script in skeleton form at the moment is,
>
> start () {
>   echo -n $"Starting chrootname supervisord: "
>   chroot /chrootpath /usr/bin/supervisord -c /etc/supervisord.conf
>   # Store pid of supervisord
>   RETVAL=$?
>   echo
>   [ $RETVAL -eq 0 ] && touch /var/lock/subsys/chrootname-supervisord
> }
>
> stop () {
>   echo -n $"Stopping chrootenv supervisord: "
>   # Get stored pid and kill process
> }
>
> Does anyone have any experience with scripts like this or thoughts on
> how to do this? I'm currently think about putting a wrapper around
> supervisor that runs in the chroot env to record the pid in the chroot env.

supervisor does or at least can write the pid file itself, though
possibly you have an old version which doesn't have that option?

cheers