[Linux-cluster] HA agents (cluster scripts)

[Jakov Sosic]

On 09/15/2010 05:08 PM, Ofer Inbar wrote:
>> I want to write few scripts for my company's services, and I don't know
>> how to debug the scripts?
>>
>> Is there any documentation regarding the issue, or something similar?
> 
> I ran into the same problem this summer.  Unfortunately, the answer is
> that mostly, full documentation does not exist.  However, there are a
> few scraps you may find very useful.
> 
> First, here are some notes on the Open Cluster Framework's resource
> agent API:
> 
> http://www.opencf.org/cgi-bin/viewcvs.cgi/specs/ra/resource-agent-api.txt?rev=HEAD
> 
> If you're doing Red Hat Cluster Suite, there's more to it than the
> OCF-common parts.  For example, RHCS metada is, I believe, specific
> to RHCS.  I pointed out some holes in the documentation to Lon on
> IRC a few weeks ago, and he began writing this page:
> 
> http://sources.redhat.com/cluster/wiki/RGManagerResourceAgents
> 
> It's still very incomplete, but already very useful (thanks Lon!)
> 
> Also, some things you can do for debugging:
> 
> 1. Sprinkle some ocf_log calls in strategic places in your script:
> 
>   ocf_log info "some debugging statement, including a $OCF_variable"
> 
>  -> Make sure /usr/sbin is in your resource agent's path!
> 
> 2. Configure logging so that your log statements make it to syslog.
> 
> See http://sources.redhat.com/cluster/wiki/RGManager
> 
> 3. Use rg_test, which I didn't know about at first.  For example:
> 
>   sudo rg_test rules
>   sudo rg_test test /etc/cluster/cluster.conf
>   sudo rg_test test /etc/cluster/cluster.conf status service myservice
>   sudo rg_test test /etc/cluster/cluster.conf start service myservice
> 
> It turns out this is documented in the ResourceTrees page on the
> cluster wiki, but I didn't read that far on that page because I
> wasn't having any trouble understanding or configuring my resource
> trees.  It's true that rg_test is useful for debugging resource
> trees, however it's also useful for troubleshooting resource agents.

Thank you! Now, this is exactly what I've looked for :)





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