[Linux-HA] Autofailback problem

[Alan Robertson]

Colin Bruce wrote:
> Dear Alan,
> 
> I'm afraid the only accounts on these two machines are root. I can't login
> as anything else so when I ran iptables -L I was logged in as root. I
> think the output I sent you is saying there are no iptables defined and no
> firewalls on the machines.
> 
> Remember I can ping each machine from the other. I am running apache on
> each machine and I can access each web page from the other using the
> machines' IP addresses (192.168.255.26 and 192.168.255.28). If I run
> IPaddr by hand and raise the service address for each machine on each
> machine (192.168.255.7 and 192.168.255.22) I can also access the web pages
> on both machines. The problem only arises if I run heartbeat which seems
> to put both addresses on both machines.

It communicates by the given port (694) by udp.  Iptables will certainly do 
this, but if you ran this as root, I'm at a loss as to how this is happening...

Your symptoms are definitely of some kind of asymmetric communication 
failure - most commonly (and BY FAR most commonly) caused by iptables.

If you have other communication software modules loaded into the kernel, 
they could be causing it by a bug or whatever...

Why don't you try setting the port number to something like 30000 or so 
just for grins...

 > If I manually try to remove one of
> the addresses, both addresses stop.

This latter weirdness is probably some kind of ifconfig bug, or other 
kernel bug.  I've seen them before - but not for several years.  A sh -x of 
IPaddr would confirm this...

What kernel exactly are you running?  Where did you get it from?   How did 
you build it?  What non-standard modules does it have loaded?

-- 
     Alan Robertson <alanr at unix.sh>

"Openness is the foundation and preservative of friendship...  Let me claim 
from you at all times your undisguised opinions." - William Wilberforce