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Re: [Linux-cluster] Dependencies in resources



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 redhat com [mailto:linux-cluster-bounces 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


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