Hi, here a howto to do proxmox 3.4 -> 4.2 cluster upgrade, with qemu live migration without interruption
Code:
1)Upgrade a first node to proxmox 4.2 and recreate cluster
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Have an empty node,
then upgrade it to proxmox 4.2, folowing the current wiki
# apt-get update && apt-get dist-upgrade
# apt-get remove proxmox-ve-2.6.32 pve-manager corosync-pve openais-pve redhat-cluster-pve pve-cluster pve-firmware
# sed -i 's/wheezy/jessie/g' /etc/apt/sources.list
# sed -i 's/wheezy/jessie/g' /etc/apt/sources.list.d/pve-enterprise.list
# apt-get update
# apt-get install pve-kernel-4.4.8-1-pve pve-firmware
# apt-get dist-upgrade
reboot
# apt-get install proxmox-ve
# apt-get remove pve-kernel-2.6.32-41-pve
# pvecm create <clustername>
2) upgrade second node
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# apt-get update && apt-get dist-upgrade
# apt-get remove proxmox-ve-2.6.32 pve-manager corosync-pve openais-pve redhat-cluster-pve pve-cluster pve-firmware
# sed -i 's/wheezy/jessie/g' /etc/apt/sources.list
# sed -i 's/wheezy/jessie/g' /etc/apt/sources.list.d/pve-enterprise.list
# apt-get update
# apt-get install pve-kernel-4.4.8-1-pve pve-firmware
# apt-get dist-upgrade
---> here no reboot
now the tricky part
# cp /bin/systemctl /
# echo "" > /bin/systemctl
# apt-get install proxmox-ve
if /etc/pve is not mounted:
# /usr/bin/pmxcfs -l
add node to cluster
# pvecm add ipofnode1 -force
--->waiting for quorum message : ctrl-c
close old corosync and delete old config
# killall -9 corosync
# /etc/init.d/pve-cluster stop
# rm /var/lib/pve-cluster/config.db*
start new corosync and pve-cluster
# corosync
# /etc/init.d/pve-cluster start
verify than you can write in /etc/pve/ and that's is correctly replicate on other proxmox4 nodes
#touch /etc/pve/test.txt
#rm /etc/pve/test.txt
migrate vms (do it for each vmid)
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verify that you have in /etc/pve/datacenter.cfg
migration_unsecure: 1
# qm migrate <vmid> <target_proxmox4_server> -online
(migrate must do done with cli, because pvestatd can't start without systemd, so gui is not working)
#cp /systemctl /bin/
# reboot node
3) do the same thing for next node(s)
4) when all nodes are migrated, remove
# rm /etc/pve/cluster.conf
