Cluster a node with less links

[ilbarone87]

Hello everyone,
I have a two nodes cluster that is clustered with a 1Gbe link (10.10.10.x) and a second 10gbe link (10.0.0.x). I want to add a third node (this is a less powerful unit that i only use for running low load LXCs and dev environment) but this unit has only the 1gbe link.
Is it possible or there's a workaround to add the third node but only selecting the 1Gbe link (10.10.10.x)?

Thanks

 

[waltar]

It's possible as we are in same situation with different roming and so missed 10G 2nd interface on 5th node. You just need to have the 1G IP'S in corosync.conf. Is that still in place at yours or do you have maybe both or just the 10G IP's there ?

 

[ilbarone87]

It's possible as we are in same situation with different roming and so missed 10G 2nd interface on 5th node. You just need to have the 1G IP'S in corosync.conf. Is that still in place at yours or do you have maybe both or just the 10G IP's there ?

yeah, can separate the 10G removing link_addr1 from corosync.conf,

EDIT:
But how to cluster the 3 nodes than? how do i set up a secure communication with the 10G ring? As removing it from corosync will result in that to be an insecure network

 

[waltar]

The corosync link has nothing to do with storage or migration access, join 3rd node as normal if the first 2 nodes have just the 1G defined in corosync. Secure communication between the 2 first nodes could be as before while the 3rd cannot use that too. We have nfs server for the 5 nodes and there's no problem, using our small 5th node just for admin and testing. Normal vm online migrations take 15s, a offline one is just a 3s config change and all runs smooth.