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

[Uwe Sauter]

Am 20.06.2017 um 13:53 schrieb Gerald Brandt:
> 
> 
> On 2017-06-20 06:30 AM, Barry Flanagan wrote:
>> 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
>>
> 
> I can temporarily fix the issue by going unicast? Are there instructions on how to do that? A quick search didn't bring anything
> up for me.

https://pve.proxmox.com/wiki/Multicast_notes#Use_unicast_.28UDPU.29_instead_of_multicast.2C_if_all_else_fails



> Gerald
> 
> 
>>> 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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