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[Question] Proxmox Cluster and Quorum (lemmy.ml)

submitted 2 years ago* (last edited 2 years ago) by [email protected] to c/[email protected]

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How do you handle Proxmox clusters when you only have 1 or 2 servers?

I technically have 3 servers but I keep one offline because I don't need it 24/7 most point wasting power on a server I don't need.

I believe I read somewhere that you can force Proxmox it to a lower number but it isn't recommended. Has anyone done this and if so have you run into any issues with this?

My main issue is I want my VM to start no matter what. For example I had a power outage. When the servers came back online instead of starting they waited for the quorum number to reach 3. (it will never reach 3 because the third server wasn't turn on.) so they just waited forever until I got home and ran

pvecm expected 2

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[–] [email protected] 1 points 2 years ago

Please do add a tag to your post as stated on the sublemmy sidebar! Thank you. :)

[–] [email protected] 1 points 2 years ago

You'll need a QDevice to keep consensus. That wiki article will cover how to set it up and some drawbacks to QDevices. You should be able to run it on a low-power device like a Pi to keep the cluster going.

[–] [email protected] 1 points 2 years ago (1 children)

AFAIK forcing it to a lower number is fine if you're not doing HA. I remember reading something along those lines on a forum, but I could be remembering wrong.

If you're not using Ceph or HA, then I don't think there would be any negative effects from not having all the servers in the cluster ready.

[–] [email protected] 1 points 2 years ago

Oh good, I am not using any of those at least not at the moment.

[–] [email protected] 1 points 2 years ago

If you are not using any HA feature and only put servers into the same cluster for ease of management.

You could use the same command but with a value of 1.

The reason quorum exist is to prevent any server to arbitrarily failover VMs when it believes the other node(s) is down and create a split brain situation.

But if that risk does not exist to begin with, so do the quorum.