Two server Proxmox cluster

Hello Experts,

I am working on a Proxmox two server cluster.

I am going to put two server as one cluster to have hardware redundancy. I have read that it is recommended to use 3 servers. We only have two for now.

What technical notes or recommendations will I need to get this project started.
marceloNYCMiddle-Tier AdministratorAsked:
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Bernard S.CTOCommented:
You need to have an odd number of nodes in your cluster, so that they can "vote" if any one of them fails: the "majority" will go on working, while on the failed cluster containers and VM will continue running if possible, but cannot be administered until the failed node(s) join back the cluster

If you have 2 nodes, quorum is 2. If any of these fails, then even the working one is considered cut from the cluster: you have 2 "broken ckusters", not just one
If you have 3 nodes, quorum is 2 again. If any of these fails, the other 2 are still attached to the working cluster which the failed node will be able to join back later.

So really consider having a 3rd node, but it can be a cheap server used just to arbiter!

Your best reading is Proxmox wiki at https://pve.proxmox.com/wiki/Documentation , although frequently it is hard and / or misleading (some texts are ambiguous)

I presume you are running Proxmox 5.0 or 5.1. If not, you should really consider upgrading asap, since there are some great improvements in the administration Web GUI

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marceloNYCMiddle-Tier AdministratorAuthor Commented:
Very nice thank you
marceloNYCMiddle-Tier AdministratorAuthor Commented:
Budget allows for two nodes for now. Thank you so much for the help
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Bernard S.CTOCommented:
B-)
Your 2-nodes cluster is really at risk.

- If your cluster is in-house, simply consider adding a Raspberry Pi as arbiter!!!https://pve.proxmox.com/wiki/Rasberry_pi_as_third_node

- If your cluster is externalized, consider some type of VPS or similar. This will run under 200€ / $ a year, quite cheaper than one ir two days of your time.

If your 2 nodes cluster crashes, look at corosync and "2_nodes_quorum"
marceloNYCMiddle-Tier AdministratorAuthor Commented:
I think I will use an older PC... Thank you so very much
Bernard S.CTOCommented:
Yes, excellent idea
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