[PVE-User] Proxmox servers don't see each other anymore

Barry Flanagan barry at flanagan.ie
Tue Jun 20 13:30:50 CEST 2017

On 19 June 2017 at 18:15, Dmitry Petuhov <mityapetuhov at gmail.com> wrote:

> So network in general is ok, cluster is just losing quorum after some time?
> Check your network for muticast querier. See https://pve.proxmox.com/wiki/
> Multicast_notes
> You need to enable querier on your router (usually gateway of servers), or
> enable it on your servers, or disable multicast snooping on switch.

Hi Dmitry

Regarding "enable it on your servers" - is it safe to enable this on all
servers in the cluster, or must it only be on one? We recently suffered an
issue on our network where multicast stopped working (an old switch was
removed and obviously it was performing the querier function) and I had to
change to unicast just to get things running again. I want to move back to
multicast but don't want to rely on it being enabled on the switches as I
do not control them.

Thanks (and apologies for the slight thread hijack)

-Barry Flanagan

> 19.06.2017 18:07, Gerald Brandt пишет:
> > I can still ping each server when there is an issue. Don't want to power
> cycle the switches during the workday, but may have to.
> > On 2017-06-19 09:57 AM, Gilberto Nunes wrote:
> >> Probably some network trouble??
> >> Did you check cables, swotch and so on??
> >> When the problem appears, can you ping each server?
> >>> My proxmox server intermittently don't see each other anymore. I keep
> >>> losing quorum.
> >>>
> >>> I have 3 Proxmox servers, and they will randomly not see each other.
> For a
> >>> few seconds proxmox-2 will see proxmox-1, but not proxmox-3. Then it'll
> >>> switch and proxmox-2 will only see proxmox-3, then it will see no one
> but
> >>> itself.
> >>>
> >>> I have the IP and names in /etc/hosts and in DNS.
> >>>
> >>> Any idea where I can start looking?
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