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:* [email protected]
[mailto:[email protected]] *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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