[ClusterLabs] Corosync do not send traffic

Jan Friesse jfriesse at redhat.com
Wed Mar 30 05:27:06 EDT 2016

> Hello,
> Due to a change in the switch in one of the datacenters now I have an odd
> behaviour in the cluster.
> I am using cman with corosync and pacemaker. The versions are:
> pacemaker-1.1.10-14.el6_5.3.x86_64
> corosync-1.4.1-15.el6_4.1.x86_64
> cman-
> The problem is, when I launch /etc/init.d/pacemaker start and the cman_tool
> launch corosync, I don't see any UDP traffic, so the cluster is "broken"
> But if I launch manually the same command "corosync -f" I do see udp
> traffic and the totem is correctly sent between nodes.
> It all began with the change in the switch, but I set the tcpdump in the
> hosts and I do not see traffic.
> I have tried the multicast and unicast configuration, different network,
> but all with the same behaviour.
> What am I missing?

I'm pretty sure main problem is that:
- corosync -f uses /etc/corosync/corosync.conf as a config file
- cman_tool join uses /etc/cluster/cluster.conf as a config file

Make sure to "replicate" (specially udpu/udp, ...) configuration from 
corosync.conf to cluster.conf and I'm pretty sure it will work.


> Best Regards
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