Howto force the multicast address

[seba]

hello,

After creating a Proxmox cluster containing 3 nodes, all functioned perfectly for 15 days.
One evening the automatic backups was failing and I could no longer migrate vms from one node to another.
Pvecm a status indicated a quorum problem (unfortunately I did not notice the error message.)
The test with the tool not working ssmping

So I deleted two cluster nodes.
I changed the settings in / etc / pve / cluster.conf
<cman keyfile="/var/lib/pve-cluster/corosync.authkey" transport="udpu"/>
To pass the cluster unicast, then I reinstalled the two nodes to finally add to the cluster.
Since all works again

I think the switch or router blocked my multicast address, but the engineer at my work indicates that there is nothing in these logs.

How to choose a new multicast address, and set at the cluster?

thank you for your comments
Seba

According to the documentation cman
http://www.sourceware.org/cluster/doc/usage.txt
it shows this configuration for cman
<cman>
<multicast addr="224.0.0.1"/>
</ cman>

<clusternode name="nd1">
<multicast addr="224.0.0.1" interface="eth0"/>
</ clusternode>

 

[dietmar]

So I deleted two cluster nodes.

I simply do not understand why you start to delete cluster nodes when there is a network problem - that makes it impossible to find the problem. If multicast worked before, you should find out why it does not work anymore.