How to disable HA permanently

The rationale for this snippet has been explained in a separate post.

This only helps you, obviously, in case you are NOT using HA. It is also a sure way of avoiding any bugs present in HA logic which you may otherwise encounter even when not using it. It further saves you some of the wasteful block layer writes associated with HA state sharing across nodes.

All CLI examples tested with PVE 8.2.

Until next reboot

You have to stop the HA CRM & LRM services first, then the multiplexer, then unload the kernel module:

systemctl stop pve-ha-crm pve-ha-lrm
systemctl stop watchdog-mux
rmmod softdog

Persistently

To make this reliably persistent following reboots and updates:

systemctl mask pve-ha-crm pve-ha-lrm watchdog-mux

cat > /etc/modprobe.d/softdog-deny.conf << EOF
blacklist softdog
install softdog /bin/false
EOF

Notes

If you are only looking to do this temporarily for maintenance, you can make use of the other snippet.