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Re: [Linux-cluster] Questions about rgmanager



Hi,

What is the behaviour of rgmanager supposed to be in case one adds a new LVM  and FS resources to an already running service?

Let's say I have a running database service on one node, and I need to add some storage to this service.

After creating all the LVM things, the filesystems,, mount them on the right node etc...
I edit the cluster.conf, setup the lines concerning  what I've added, and upgrade file version.

Running then ccs_tool update /etc/cluster/cluster.conf will it restart my modified service ? 
Brem
  

2009/8/19 brem belguebli <brem belguebli gmail com>
Hi,
 
Changing the cluster version reloads the rgmanager configuration, but it restarts my custom resources despite the fact that they were "started" (in clustat).
 
Just changing the cluster.conf version, not doing anything to my custom resource makes this happen. 
 
In the log I get the message  :
<info> Stopping changed resources
<info> Restarting changed resources
<info> Starting changed resources
 
which may be generic messages and then I see my resources being stopped and restarted.
 
Sometimes, I also can notice that my service after being stopped, I have a monitor action that is triggered that fails (normal service is stopped) and that disables (status failed) completely the service.
 
I'm running Rhel 5.3 (I saw the post about VM's on RHel 5.2 which seems to be similar).
 
I've tried to run rgmanager in debug (clurgmgrd -d) mode but it seems to get stuck  
 
Any idea on what I may be missing ?
 
 
2009/8/19, brem belguebli <brem belguebli gmail com>:
thx Lon

2009/8/18 Lon Hohberger <lhh redhat com>

On Tue, 2009-08-18 at 11:01 +0200, brem belguebli wrote:
> Hello,
>
> I have a few questions about rgmanager:
>
> 1) How to make it take into account resource metadata changes without
> restarting it. service rgmanager reload (or kill -HUP) doesn't.
>     In case one needs to change some timers in a resource metadata,
> the only way to make it is to stop and start rgmanager which brings
> down the resources.

 
Need to change the configuration version in cluster.conf; rgmanager
doesn't record for example file mtimes and run stat() to see if metadata
changed.  Doing this wouldn't work anyway, as some resources have
external metadata.

> 2) Is there a way to log what "rules" rgmanager succeded to load at
> start time (or the ones it failed to), as having a "24 rules loaded"
> message isn't very explicit.

 
You can run:

  rg_test rules | grep ^Agent

There's no way currently to have rgmanager log specifically which agent
it loaded at run-time.

> The last point concerns the potential replacement of rgmanager with
> pacemaker (as stated at
> http://sources.redhat.com/cluster/wiki/RGManager). Will this happen in
> a near future ?

 
Not immediately; we still have a bit to go:

* need configuration file format conversion utility
* need basic "work-alike" tools.  Ex: clustat.
* need to do a bit of work on rgmanager agents so they work
 on pacemaker - the standard by which rgmanager+pacemaker
 operate was inadequate and the two programs have diverged
 in slightly incompatible ways

-- Lon

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