[Linux-cluster] killproc annoyance

[Scott McClanahan]

According to the link at the bottom, a stop argument to an already
stopped service should return a success just like a start on an already
started service should be interpreted as a success.  So I have rewritten
most of my init scripts which are managed by clurgd to be spec
compliant.  Unfortunately, how do you really know if the service is
stopped?  How can you be certain the pid file got written or is even
correct (race conditions)?  Anyway, I have written init scripts for
apache, tomcat, and IBM MQ to name a few and have tested the hell out of
them so let me know if you want a working example.

http://refspecs.freestandards.org/LSB_2.0.1/LSB-Core/LSB-Core/iniscrptact.html

On Wed, 2007-04-18 at 19:41 -0400, Tarun Reddy wrote:
> So just started working with RH4's clustering services and have run 
> into a bit of a "deadlock" problem that I'm trying to see if anyone 
> else has seen/fixed.
> 
> 1) Start off with working config, add httpd as a clustered service, 
> and every thing is great. Fails over to other machines great.
> 
> 2) Mess up the apache config (like adding a virtual IP that doesn't 
> exist on the system). Even though configtest works, we have a broken 
> config.
> 
> 3) So you restart apache without knowing the config is bad, while the 
> clustering service is running. Apache doesn't come back up. Okay, 
> cool, well go fix the problem and try to tell clustering to restart 
> the service.
> 
> Here is where things get annoying.
> 4) Now clustering says the service is failed. So it attempts to 
> "service httpd stop" which killproc in /etc/init.d/functions returns 
> a 1 since it wasn't running before. This causes the clustering 
> software to fail the stop, and hence leave the service in a failed 
> state. I can't get httpd up without the virtual IPs that are 
> associated to the service, so I can't get killproc to ever return a 0 
> when stopping the service. Shouldn't killproc return a 0 if none of 
> the httpd daemons are still running?
> 
> I guess for now, I'll try and force some aliases for the IPs, get 
> httpd up and running, disable the service, remove the aliases, and 
> then enable the service. Lots of stuff to do if I was in a crisis 
> mode in production.
> 
> Anyone have an opinion on killproc return codes?
> 
> Thanks,
> Tarun
> 
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