docker-proxmox-quorum-device

To add a Docker container as a Proxmox qdevice (useful in evenly numbered clusters) run the following process:

1. uncomment the port 22 line in docker-compose.yml
2. on the Docker host run docker compose up --build -d
3. on one of your Proxmox nodes run pvecm qdevice setup <Docker host IP> and login with the container's root password securepassword
4. (optional) check with pvecm status that everything has worked out correctly
5. comment the port 22 line in docker-compose.yml
6. on the Docker host run docker compose up --build -d

You can find all the Proxmox docs here and linked in the repo files.