[Linux-HA] Adding to a group without downtime

[Gavin Hamill]

Hi :)

I'm using the Lenny packages http://people.debian.org/~madkiss/ha/ and
have been enjoying success with pacemaker + heartbeat (I've used a
heartbeat v1 config for years without problems).

I have a few IPaddr2 primitives in groups, but I'd like to understand
how I can add a new primitive into an existing group without
stopping/starting. At the moment I have to:

# primitive failover-ip-186 ocf:heartbeat:IPaddr2 params ip="10.8.2.186"
op monitor interval="10s" 
# show www-frontends 
group www-frontends failover-ip-184 failover-ip-185
# delete www-frontends 
# group www-frontends failover-ip-184 failover-ip-185 failover-ip-186
# commit 

But that takes failover-ip-184 and failover-ip-185 down for a couple of
seconds. Is there a way to add a new primitive to a group with zero
downtime?

I tried using 'edit www-frontends' to stick failover-ip-186 on the end
of the line but it complains loudly "Call cib_modify failed (-47):
Update does not conform to the configured schema/DTD"

Thanks for such great software! :)

Cheers
Gavin.