[PVE-User] Proxmox Fencing

Eneko Lacunza elacunza at binovo.es
Mon Jul 5 13:30:41 CEST 2021


Hi Alex,

El 5/7/21 a las 13:18, Alex K escribió:
> Hi all,
>
> I'm new to proxmox and trying to setup a 2 + 1 node active/active HA
> cluster on top glusterfs using latest community pve-manager/6.4-4/337d6701
> (running kernel: 5.4.106-1-pve). The third node is  used for gluster
> arbitration and perhaps I have to configure in it a quorum disk also to
> keep quorum in case of a node failure (not clear yet at my mind, still
> reading the docs).
If you have 3 nodes, you want all them in Proxmox cluster for proper 
quorum majority. No need for quorum disk that way. (note that I don't 
know how gluster works).
> I am stuck at the moment at the fencing part of the setup. Reading through
> the docs it seems that I have only the option to setup hardware watchdog
> fencing. I would expect to be able to use external media such as IPMI,
> iDrac, HP iLO or UPS based power management (APC) though I can't find any
> info how these are configured at current version of Proxmox.
Currently by default Proxmox uses a software watchdog. I'm not sure if 
hardware watchdog support was introduced, others may help with this.
> In case of a network partition and not a node hardware issue, how is the
> watchdog going to behave? Is a healthy but disconnected node going to be
> power cycled? I will soon proceed with testing as soon as I manage to setup
> fencing though I wanted to better understand this part of fencing.

The node that drops out of quorum will be rebooted. If there where 
CM/CTs configured for HA in that node, Proxmox will attempt to restart 
them in another node.

Cheers

Eneko Lacunza
Zuzendari teknikoa | Director técnico
Binovo IT Human Project

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