[Pacemaker] crond on both nodes (active/passive) but some jobs on active only

[andreas graeper]

thanks a lot !


2013/7/5 Lars Ellenberg <lars.ellenberg at linbit.com>

> On Fri, Jul 05, 2013 at 04:52:35PM +0200, andreas graeper wrote:
> > when i wrote a script handled by ocf:heartbeat:anything i.e. that is
> > signalling the cron-daemon to reload crontabs
> > when crontab file is enabled by symlink:start and disabled by
> symlink:stop
> >
> > how can i achieve that the script runs after symlink :start and :stop ?
> > when i define order-constraint R1 then R2 this implizit means R1:start ,
> > R2:start and R2:stop, R1:stop ?
> >
>
> Not an answer to that specific question,
> rather a "why even bother" suggestion:
>
> You say:
> > > two nodes active/passive and fetchmail as cronjob shall run on active
> only.
>
> How do you know the node is "active"?
> Maybe some specific file system is mounted?
> Great.  You have files and directories
> which are only visible on an "active" node.
>
> Why not prefix your cron job lines with
> test -e /this/file/only/visible/on/active || exit 0; real cron command
> follows
>  or
> cd /some/dir/only/on/active || exit 0; real cron command
>
>  or a wrapper, if that looks too ugly
> only-on-active real cron command
>
> /bin/only-on-active:
> #!/bin/sh
> same-active-test-as-above || exit 0
> "$@" # do the real cron command
>
>         Lars
>
> > 2013/7/5 andreas graeper <agraeper at googlemail.com>
> >
> > > hi,
> > > two nodes active/passive and fetchmail as cronjob shall run on active
> only.
> > >
> > > i use ocf:heartbeat:symlink to move / rename
> > >
> > > /etc/cron.d/jobs <> /etc/cron.d/jobs.disable
> > >
> > > i read anywhere crond ignores files with dot.
> > >
> > > but new experience: crond needs to restarted or signalled.
> > >
> > > how this is done best within pacemaker ?
> > > is clone for me ?
> > >
> > >
> > > thanks in advance
> > > andreas
>
>
> --
> : Lars Ellenberg
> : LINBIT | Your Way to High Availability
> : DRBD/HA support and consulting http://www.linbit.com
>
> DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
>
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