[Pacemaker] HA Cluster Connected over VPN

Dejan Muhamedagic dejanmm at fastmail.fm
Wed Jan 25 07:52:32 EST 2012

On Wed, Jan 25, 2012 at 01:09:43AM +0100, Arnold Krille wrote:
> On Tuesday 24 January 2012 23:55:57 Dejan Muhamedagic wrote:
> > On Tue, Jan 24, 2012 at 09:51:49PM +0100, Arnold Krille wrote:
> > > Using the same subnet for two communication-rings will disturb corosync
> > > as it uses multicasts for communication. And that is best done with one
> > > multicast- channel per subnet.
> > Newer corosync (at least since 1.4.x, perhaps earlier) can do
> > udpu instead of multicast. I'd suggest to use that. Ask on the
> > corosync-discuss list about how to tune for your network.
> Last time I checked, using multicasts implied using udp. There is no 1-to-1 
> endpoint-connection in multicast as you would need for tcp.
> Maybe you meant the use of broadcasts? That is in fact a thing of the past. a) 
> it pollutes your whole network when you use your "public" network as one of 
> the communication-rings. b) its not available as soon as you use ipv6.

udpu is unicast UDP, i.e. all nodes need to be listed in
corosync.conf (see corosync.conf(5)).



> Have fun,
> Arnold

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