[tech] Proxmox 6 Upgrade

[Coffee]

Hi all,

I'm planning on upgrading the Proxmox cluster this Wednesday, 2020-05-06.

I'll be following the official upgrade guide at: 
https://pve.proxmox.com/wiki/Upgrade_from_5.x_to_6.0 and I've 
successfully tested the upgrade procedure on the test cluster without 
any issues.

The upgrade will take place in 3 phases:

 1. Cluster wide upgrade to Corosync 3:  Corosync must be upgraded
    across the  whole cluster before the move to Proxmox 6, during this
    phase VM's will continue to run normally, however the cluster will
    become non-quorate and users will be unable to manage the cluster
    until the Corosync upgrade is complete.
 2. Rolling Upgrade to Proxmox 6: Nodes will be upgraded one at a time
    with VM's migrated off the node being upgraded. I've confirmed that
    VM's can be safely migrated from a v5.4 node to a v6.0 node allowing
    us to upgrade the cluster without any downtime.
 3. Ceph upgrade: Once the cluster has been fully upgraded there is a
    ceph update that can be applied. As I have not yet tested this
    process this step is likely to be deferred to a later date.

Users should not expect any noticeable downtime for most VM's, with the 
exception of salmon and the discord-irc bridge as these machines are 
containers and thus cannot be live migrated.

Regards,

Zack [CFE]

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