[Linux-ha-dev] problem with ha_clustermsg to attrd

[Meyer, Fred H (Fred)]

After looking through the Makefiles, I found attrd_updater in /usr/sbin
and it came from the pacemaker-heartbeat rpm.

It does not look like I will need to rebuild the rpms, but I am still
interested in the configuration arguments to rpmbuild.

Thanks,
Fred

-----Original Message-----
From: linux-ha-dev-bounces at lists.linux-ha.org
[mailto:linux-ha-dev-bounces at lists.linux-ha.org] On Behalf Of Meyer,
Fred H (Fred)
Sent: Monday, August 04, 2008 10:58 AM
To: High-Availability Linux Development List
Subject: RE: [Linux-ha-dev] problem with ha_clustermsg to attrd

Thanks Andrew,

The addrd_updater is just what I was looking for.  I think I should be
able to use it directly.

I have installed heartbeat-2.1.3-22.1 with pacemaker-heartbeat-0.6.5-8.1
(also installed heartbeat-common, heartbeat-resources) on my target
machine.  I did not find attrd_updater in /usr/lib/heartbeat.  I see
that attrd_updater.c is in both the heartbeat and pacemaker-heartbeat
source rpms.  I assume the pacemaker-heartbeat is the one that should be
used. 

Question: 
I am new to "rpmbuild" and did not know how to configure heartbeat and
pacemaker-heartbeat to build them to be used together for RHEL5?  After
that I would need to enable attrd_updater to be built also.

Thank you,
Fred

-----Original Message-----
From: linux-ha-dev-bounces at lists.linux-ha.org
[mailto:linux-ha-dev-bounces at lists.linux-ha.org] On Behalf Of Andrew
Beekhof
Sent: Monday, August 04, 2008 7:21 AM
To: High-Availability Linux Development List
Subject: Re: [Linux-ha-dev] problem with ha_clustermsg to attrd

2008/7/29 Meyer, Fred H (Fred) <fhmeyer at avaya.com>:
> Group,
>
> I was not sure if the question was for the dev group or the user
group.
> Please forgive me if I posted to the wrong group.
>
> I am attempting to manipulate an attr value similar to that of pingd.
>
> I am using heartbeat-2.1.3-22.1 with
> pacemaker-heartbeat-0.6.5-8.1(also
> installed are heartbeat-common, heartbeat-resources, and
heartbeat-devel).
>
> I have two questions.  First is the use of ha_clustermsg to send a 
> message to attrd.  The second has to do with building "C" code that 
> uses the IPC interface and the RPMs required to do so.
>
> First question, I sent the message using (run as root with "apiauth me

> uid=root" in the ha.cf":
> ha_clustermsg <<-!MSG
> t=attrd
> src=me
> task=update
> attr_name=myAttr
> attr_value=100
> attr_dampening=5s
> dest=thisNode
> !MSG
>
> I did not see anything happening in the CIB or the logs.  I set "debug

> 3" in the ha.cf and found that message was received and dispatched to
attrd.
>
> What I found was that attrd_ha_callback() calls find_hash_entry(msg), 
> which constructs a new hash entry for myAttr.  The problem appears 
> that this function did not process the attr_value from the message and
left it NULL.
> When the hash entry is then passed to attrd_perform_update() it 
> attempts to delete myAttr from the CIB because the value is NULL.  I 
> did not see how
> update_attr() would be called.
>
> Is this a bug?  Should find_hash_entry() have processed the attr_value

> token from the message?  Should I not be doing this?!?

The last one.  If you want to know how to interact with attrd
programatically, look at the source for attrd_updater
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