[PVE-User] mi first cluster

Dominik Csapak d.csapak at proxmox.com
Fri Apr 2 11:28:29 CEST 2021

On 4/1/21 18:58, Leandro Roggerone wrote:
> Hi guys :


> Im preparing my second proxmox box to create my first cluster.
> IT does not contain any usefull data yet , so I can play aorund a little
> bit.
> Have some questions.
> Is it possible to create a cluster with only two boxes ?


> I understood it is possible , but can not move VMs without service
> disruption.

if you mean HA, yes you need at least 3 nodes or 2 nodes + a quorum 
device, also the storage needs to be avaiable on both nodes

live migration still works even with 2 nodes, and even with local storage

> And if I want to move VMs without services disruption I need a third box.
> What is ceph storage for ?
> what is ZFS pool for  ?

what do you mean?

ceph is distributed, redundant, software defined storage
zfs is a type of local filesystem and disk management

> In case I need I can add it on any of my available bays o any box ?
> Do pve boxes need to be on same network subnet ?

generally no, i think, but it makes it easier

> I have two datacenters , I was thinking in the idea to install them on each
> location just for redundancy.
> Lets supose network connection performance is optimal ... Is there any
> problem with that ?

i'd advise against that. our clustering stack uses corosync, which
needs low latency links to work properly

> Any other clustering good practice advice would be wellcome.
> Thanks.
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