[Linux-cluster] Running a cluster on routed networks

[Székelyi Szabolcs]

On 2011. November 3. 13:29:25 Digimer wrote:
> On 11/03/2011 01:12 PM, Székelyi Szabolcs wrote:
> > On 2011. November 2. 21:00:18 Székelyi Szabolcs wrote:
> >> how can I run a cluster on a network where nodes are on different
> >> subnets? Currently the main problem is that heartbeats are sent with
> >> their IP level TTL set to 1, which keeps them from reaching the other
> >> nodes. How can I change this? I'm using multicasting.
> > 
> > OK, I've found this: https://bugzilla.redhat.com/show_bug.cgi?id=640311
> > ,
> > saying that it's now possible to set the TTL for multicast. But I
> > haven't
> > found any info on *how* to set it.
[...]
> > But whatever I do, ccs_config_validate always says that my cluster.conf
> > is invalid, and the TTL (as reported by tcpdump) is still zero. Is it
> > possible that my cman is out of date? I'm using version 3.0.12. Can you
> > tell me which is the eariest version that has this feature?
> > 
> > Thanks,
> 
> Looking in the cluster.rng file (the one used to validate cluster.conf),
> '<cman ttl="x" ...>' should be valid. What version of cman are you using?

If I add the ttl="8" attribute to <cman> in cluster.conf, it fails to validate 
according to ccs_config_validate. Without this attribute it validates. I've 
grepped cluster.rng for "ttl", but found nothing sensible. It looks like it's 
missing from my cluster.rng.

My cman's version is 3.0.12:
$ sudo cman_tool -V
cman_tool 3.0.12 (built Jul  2 2010 09:55:13)

The cluster starts with the attibute (it issues a warning), but the TTL is 
still 1.

I've already upgraded corosync to support TTL adjustment, but it looks like I 
just have a problem to push it through cman.

Thanks,
-- 
cc