IMPORTANT: don't do anything else on the nodes while doing the following steps, you are disabling safety checks that prevent bad things from happening!

since you haven't written anything about nodes actually going down/being fenced, I assume you don't have HA enabled/active ;) if you do, you need to stop HA services first!

Code:

# stop corosync and pmxcfs on all nodes
$ systemctl stop corosync pve-cluster

# start pmxcfs in local mode on all nodes
$ pmxcfs -l

# put correct corosync config into local pmxcfs and corosync config dir (make sure to bump the 'config_version' inside the config file)
$ cp correct_corosync.conf /etc/pve/corosync.conf
$ cp correct_corosync.conf /etc/corosync/corosync.conf
OU rm /etc/pve/corosync.conf
et rm /etc/corosync/corosync.conf
ET REMETTRE UNE SAUVEGARDE ou reconstruire un nouveau cluster

# kill local pmxcfs
$ killall pmxcfs

# start corosync and pmxcfs again
$ systemctl start pve-cluster corosync

# check status
$ journalctl --since '-5min' -u pve-cluster -u corosync
$ pvecm status


######################### JOINDRE LE NODE AVEC 
deux nodes planté dans le cluster
>>>>> en ssh sur le node en fonction

systemctl stop corosync pve-cluster
pmxcfs -l
sauvegarde de /etc/pve/corosync.conf
sauvegarde de  /etc/corosync/corosync.conf
systemctl start corosync pve-cluster
Accés à l'interface web OK.