[PVE-User] Recurring crashes after cluster upgrade from 5 to 6

[Laurent CARON]

Hi,


After upgrading our 4 node cluster from PVE 5 to 6, we experience 
constant crashed (once every 2 days).

Those crashes seem related to corosync.

Since numerous users are reporting sych issues (broken cluster after 
upgrade, unstabilities, ...) I wonder if it is possible to downgrade 
corosync to version 2.4.4 without impacting functionnality ?

Basic steps would be:

On all nodes

# systemctl stop pve-ha-lrm

Once done, on all nodes:

# systemctl stop pve-ha-crm

Once done, on all nodes:

# apt-get install corosync=2.4.4-pve1 libcorosync-common4=2.4.4-pve1 
libcmap4=2.4.4-pve1 libcpg4=2.4.4-pve1 libqb0=1.0.3-1~bpo9 
libquorum5=2.4.4-pve1 libvotequorum8=2.4.4-pve1

Then, once corosync has been downgraded, on all nodes

# systemctl start pve-ha-lrm
# systemctl start pve-ha-crm

Would that work ?

Thanks