Create cluster
Only hosts thas doesnt have any virtual guests running can be added to a cluster!
corosync.conf
The config from cluster is saved in the file /etc/pve/corosync.conf. When installing a new node sometimes this can be hanging on the corosync service. To solve try to remove on the master:
bash
systemctl stop pve-cluster
systemctl stop corosync
pmxcfs -l
rm /etc/pve/corosync.conf
rm -r /etc/corosync/*
killall pmxcfs
systemctl start pve-cluster