Thank you, Ken! On Thu, May 11, 2017 at 11:19 AM, Ken Gaillot <kgail...@redhat.com> wrote:
> On 05/05/2017 03:09 PM, Sergei Gerasenko wrote: > > Hi, > > > > I have a very simple question. > > > > Pacemaker uses a dedicated "multicast" interface for the totem protocol. > > I'm using pacemaker with LVS to provide HA load balancing. LVS uses > > multicast interfaces to sync the status of TCP connections if a failover > > occurs. > > > > I can understand services using the same interface if ports are used. > > That way you can get a socket (ip + port). But there's no ports in this > > case. So how can two services exchange messages without specifying > > ports? I guess that's somehow related to multicast, but how exactly I > > don't get. > > > > Can somebody point me to a primer on this topic? > > > > Thanks, > > S. > > Corosync is actually the cluster component that can use multicast, and > it does use a specific port on a specific address. By default, it uses > ports 5404 and 5405 when using multicast. See the corosync.conf(5) man > page for mcastaddr and mcastport. Also see the transport option; > corosync can be configured to use UDP unicast rather than multicast. > > I don't remember much about LVS, but I would guess it's the same -- it's > probably just using a default port if not specified in the config. > > _______________________________________________ > Users mailing list: Users@clusterlabs.org > http://lists.clusterlabs.org/mailman/listinfo/users > > Project Home: http://www.clusterlabs.org > Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf > Bugs: http://bugs.clusterlabs.org >
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