IPv6 support for cluster

Nov 20, 2020
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Hi,

I'm trying to setup the mail gateway cluster on IPv6, but even if I enter the IPv6 destination address when joining the cluster - slave connects, finds the IPv4 address and then switches to it and start using it.

Is there a way to join and keep all communication for cluster over IPv6 and not immediately switch to IPv4?

Even better would be if we could use both protocols for cluster sync and whichever works - that one is used. Maybe an option to add a cluster master by DNS name?

Thoughts?

Cheers, Jan
 

Stoiko Ivanov

Proxmox Staff Member
Staff member
May 2, 2018
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I'm trying to setup the mail gateway cluster on IPv6, but even if I enter the IPv6 destination address when joining the cluster - slave connects, finds the IPv4 address and then switches to it and start using it.
have not tried this - so take the remainder with a grain of salt:
* you could try to configure both nodes to resolve to their ipv6 address (by adapting /etc/hosts and removing the ipv4 address)
* the cluster.conf should be able to handle the ip field containing an ipv6 address
(alternatively you could try to just put the ipv6 addresses in /etc/pmg/cluster.conf (after joining the nodes with their ipv4 addresses - and restarting the machines)

Even better would be if we could use both protocols for cluster sync and whichever works - that one is used. Maybe an option to add a cluster master by DNS name?
To be honest these things are usually more brittle in practice than one expects (we switched to explicitly using the ip-addresses for PVE clusters recently (after changing to hostnames in between)) - and it leads to hard to diagnose bugs - so I think we'll stick to explicit addresses for the time being

Please share your results (especially logs and outputs if there are issues) - if it does not work (and cannot be fixed by editing a few config files) we can look into it (no promises on a timeframe though)

I hope this helps!
 

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