CentOS - Mar 2013 - fencing nodes with drac under 5.9

Hi all,

A recent update to CentOS 5.9 has broken my cluster's ability to fence
nodes.  I have two Dell's which are both fenced via their DRAC6 cards.  The
current configuration in cluster.conf for the fencing devices is:

<fencedevice agent="fence_drac5"
cmd_prompt="admin1-&gt;"
ipaddr="192.168.251.11" login="fencer"
name="ms1-drac" passwd="[omitted]"
secure="1"/>

After the updates, when one of the two systems comes online and starts the
cman service, it will startup fencing.  At that point it contacts the other
node and reboots it repeatedly, never allowing the system to come back
online.  If I disable the cman service and renable it after both systems
come back online, when cman starts up, it reboots the other and the process
starts over again.

Fencing with DRAC devices is not terribly well-documented, so I immagine
there was something in the update that changed the way this worked.  I
originally used system-config-cluster to created the configuration file,
but that had to tweak it adding the fence_drac5 agent manually because the
configuration tool didn't support it.  I also tried recreating the cluster
with conga, via luci and ricci, but no success there either.

Is anyone out there doing clustering with Dells and DRAC6 cards under
CentOS 5.9?  Or under CentOS 6 for that matter... I'm willing to update if
it fixes this.

thanks in advance,

...adam

____________________________________________
Adam Wead
Systems and Digital Collections Librarian
Rock and Roll Hall of Fame and Museum
216.515.1960 (t)
215.515.1964 (f)

> I have two Dell's which are both fenced via their DRAC6 cards.

Without your cluster config, we can only guess. Fencing w/ two nodes
requires specific startup config for this scenario. Given that, I presume you
can find your issue, or post your conf.


jlc

Brilliant.  Many thanks.  I love great documentation: "once the guns are
out, someone *must* win"
____________________________________________
Adam Wead
Systems and Digital Collections Librarian
Rock and Roll Hall of Fame and Museum
216.515.1960 (t)
215.515.1964 (f)


On Tue, Mar 5, 2013 at 8:44 PM, Joseph L. Casale
<jcasale at activenetwerx.com>wrote:
> > Turns out I spoke too soon.
>
>
>
> Slow down cowboy, man fenced:)
>
>
> See clean_start for example. There are more than one param needed
> for a two node cluster.
>
>
> https://fedorahosted.org/cluster/wiki/FAQ/Fencing#fence_stuck
> https://fedorahosted.org/cluster/wiki/FAQ/Fencing#fence_startup
>
>
>
>
> Much discussion about this, for example:
> http://www.mail-archive.com/linux-cluster at redhat.com/msg07289.html
> ...
>
>
> Running a cluster is the result of a need for HA. You need to learn and
> most importantly
> *lab* these scenarios up to validate your setup and know what to do in all
> the scenarios
> you may encounter. The cluster wiki is packed full of good info, give it a
> read.
>
>
> jlc
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>