Changing Clusters IP-Addresses

[ewuewu]

Our company decided to move our complete equipment into a new computing center. Due to that, we have to change the ip addresses of our thee node cluster (Proxmox VE 3.1). The dns-names of the nodes are remaining the same. I am a little bit unsure if we can fall into some trouble if we simply change the addresses. Is there a recommended procedure for such a movement? Any help is appreciated.

 

[udo]

Hi,
the "official" way is an backup of VMs/CTs/Config-files. An new installation and restore of the VMs/CTs.

Udo

 

[e100]

Not sure if this is recommended but should work.

Look at /etc/hosts
The addresses there define what network is used for the cluster communications.

You *should* be able to alter your IP addresses, edit the hosts file and then reboot each node one by one and have the cluster work OK one all nodes are rebooted.

I have done this before but it was not on a production cluster. In my case I moved the cluster network from Ethernet to Infiniband using IPoIB.

 

[m.ardito]

I think ssl keys authorized hosts could make troubles, too. Don't know about config.db
It would be nice to know.

Marco

 

[dietmar]

Don't know about config.db
It would be nice to know.

AFAIK we do not store IP addresses there.