On Sat, Jun 09, 2007 at 09:22:19PM -0700, Roger Peña wrote:
>
> --- chirantha pitigala <chiranthlk@xxxxxxxxx> wrote:
>
> > Hi roger,
> >
> > What I need is dependency between services. e.g:
> > service 1 depends on successful start of service 2.
> > Is it possible to do by making parent-child
> > relationship between script resources of two
> > services?
> What I try to do is think of service as "cluster
> services", a service that a cluster will bring, not a
> unix service (httpd or ftp)
> if I do it in that way, nothing will stop me of having
> two unix services as resource of a cluster service,
> more important if this two unix services depend
> between them.
You can have as many dependent parts of a single service currently, but
not between them:
<service name="1">
<script name="ftp" file=...>
<script name="httpd" file=.../>
</script>
</service>
If you have RHEL4.5, you can also put all the scripts at the top level
to ensure the same ordering:
<service name="1">
<script name="ftp" file=.../>
<script name="httpd" file=.../>
</service>
However, you can't do something like this right now:
<resources>
<script name="ftp" file=.../>
<script name="httpd" file=.../>
</resources>
<service name="1">
<script ref="httpd"/>
</service>
<service name="2">
<script ref="ftp">
[some magic stuff to wait for service 1]
</script>
</service>
There's partial (read: demo) code in head CVS which implements higher
level dependencies, but it is integrated with the rest of rgmanager
yet.
-- Lon
--
Lon Hohberger - Software Engineer - Red Hat, Inc.
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