[Linux-cluster] RHCS4 rgmanager/clurmgrd problem

[Greg Forte]

this has been covered, previously, but in brief:

a) the cluster services try to stop a service before starting it when 
you enable it
b) it expects the "/etc/init.d/service stop" command to return 0, 
indicating that there was no problem
c) many of the stock service scripts return non-zero if you try to stop 
them when they're not running

depending on your point of view, (c) is the "correct" behavior or not; 
in the case of cluster services, it's obviously not.  For the purposes 
of cluster services, the script should only return non-zero on the 
'stop' command if the service was, in fact, running, and the script 
failed to stop it.  A better solution than simply returning 0 
braindeadly would be to check the output of the script's 'status' 
command, and only attempt the stop if it's actually running, then return 
non-zero if the stop fails, 0 (success) if the stop succeeds OR it 
wasn't running in the first place.  But that's a lot of work.  ;-)

-g

Philip R. Dana wrote:
> I found a work around. Like the gentleman with the mysql service problem
> a while back, I edited /etc/init.d/named on both nodes such than named
> stop returns 0, even though named is already stopped. I'm not smart
> enough, yet, to figure out why that works, but it does.
> 
> On Thu, 2006-03-16 at 07:22 -0800, Philip R. Dana wrote:
>> We have a two node active/passive cluster running bind as our master DNS
>> server. Shared storage is iSCSI on a NetApp Filer. The OS is CentOS 4.2.
>> Whenever the rgmanager service on the passive node is started/restarted,
>> the service resource on the active node fails in that named itself is
>> shut down. The only way to recover, as near as I can tell, is to set
>> autostart=0 in cluster.conf, reboot both nodes, then manually start the
>> service on one of the nodes. Is this by design, or an "undocumented
>> feature"?
>> Any help will be greatly appreciated. TIA.
>>
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-- 
Greg Forte
gforte at udel.edu
IT - User Services
University of Delaware
302-831-1982
Newark, DE