Cluster with 1 node only?

[yos]

Hi

I have a 3 node cluster but for heating reasons, as the temperature of the room is getting high in the summer, I would like to temporary shutdown 2 nodes and have my setup running on one node only. The questions are:

1. is it healthy to run a cluster with one node?
2. what are the consequences of running the `pvecm expected 1` command?
3. when the temperature are better, will i need to do `pvecm expected 2`?

thx

 

[Deadpan110]

This all depends on a few things.

1. The filesystem used between nodes for your containers/virtual machines
   Ceph can be scaled down depending on settings - but will need 2 mons to run in a 3 node cluster (there are unsafe workarounds)
2. Quorum between nodes
   Corosync has 'last man standing' options you could configure as-well as using node votes within the config

BEWARE!! There be dragons!!

 

[Rares]

This could be related: https://forum.proxmox.com/threads/3-node-cluster-with-independent-nodes.131610/