[Linux-cluster] Dependencies in resources

[Scooter Morris]

Alfredo,
    Thanks!  That was very helpful, although I have a couple more 
questions for the list.  What I am trying to do seems well suited for 
the existing "depend" and "depend-mode" capability.  Essentially, I'm 
trying to use this to "group" services.  So, assume I have 3 services: 
A, B, and C (in my case, A is an IP service, B and C both have an fs and 
a script resource).  I want B and C to depend on A such that B and C 
will only start on the node where A is running.  I assume I can do this by:

   <service autostart="1" name="B" recovery="relocate" 
depend="service:A" depend-mode="hard">
      <fs ... />
      <script .../>
    </service>

    <service autostart="1" name="C" depend="service:A" depend-mode="hard">
      <fs .../>
      <script .../>
    </service>

    <service autostart="1" name="A" recovery="relocate">
      <ip ref="xxx.xxx.xxx.xxx"/>
    </service>

Unfortunately, this didn't work as expected.  If I start A on node 1, 
services B and C seem perfectly happy to run on any other node.  If a 
coerce everybody on the same node, and relocate (or disable A), services 
B and C continue on blissfully ignoring the status of A.  Do I need to 
write and event handler for this situation (which seems much simpler 
than the follow-service script)?

Again, thanks in advance!

-- scooter

Moralejo, Alfredo wrote:
>
> Take a look into
>
>  
>
> https://inquiries.redhat.com/go/redhat/ReferenceArchitectureSAPClusterSuite
>
>  
>
> Deploying Highly Available SAP Servers using Red Hat Cluster Suite
>
>  
>
> Gives some example about dependencies on services etc..
>
>  
>
> A very good document
>
>  
>
>  
>
>  
>
> ------------------------------------------------------------------------
>
> *From:* linux-cluster-bounces at redhat.com 
> [mailto:linux-cluster-bounces at redhat.com] *On Behalf Of *Scooter Morris
> *Sent:* Thursday, July 23, 2009 11:08 PM
> *To:* linux clustering
> *Subject:* [Linux-cluster] Dependencies in resources
>
>  
>
> Hi all,
>     I saw in a message on the net about a *depends="service:xxxx" 
> *option for services in cluster.conf for 5.3beta.  Did this 
> single-level dependency support make it into the 5.3 release?  It 
> would be really, really useful if it did!  If not, can anyone suggest 
> a way that I can have a multiple services depend on a single IP?
>
> Thanks in advance!
>
> -- scooter
>
> ------------------------------------------------------------------------
>
> --
> Linux-cluster mailing list
> Linux-cluster at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-cluster

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