[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

Re: [Linux-cluster] Dependencies in resources

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

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

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




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

-- Linux-cluster mailing list Linux-cluster redhat com https://www.redhat.com/mailman/listinfo/linux-cluster

fn:John "Scooter" Morris, Ph.D.
org:University of California, San Francisco MC 2240;Resource on Biocomputing, Visualization, and Informatics
adr:;;600 16th St.;San Francisco;CA;94158-2517;USA
email;internet:scooter cgl ucsf edu
title:Executive Director

[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]