Rodrigo de Avila

Proxmox

Change Node Hostname

To change the node hostname:

  • Power off all VMs and containers
  • SSH into the node
  • Change the hostname in /etc/hostname and /etc/hosts
  • Reboot
  • After reboot, the web interface will show the old name as "disconnected", and the new name appears
  • SSH into the node again and go to /etc/pve/nodes
    • Here you will see a folder with the new name, and a folder with the old one.
    • Inside each one, there's a lxc and qemu-server folder
    • Move the contents of lxc from the old folder to the new folder
    • Move the contents of qemu-server from the old folder to the new folder
  • Remove the folder with the old name
  • Start the VMs and containers again

If you have LVM disks in use, you need to associate them to the new hostname:

  • In the web interface, go to Datacenter > Storage
  • Double-click your LVM disk
  • On Nodes, select the new hostname
  • Click OK

Enable /dev/net/tun on Container Hosts

Edit the container configuration file, usually located at /etc/pve/lxc/<container_id>.conf, and add this content:

lxc.apparmor.profile: unconfined
lxc.cgroup.devices.allow: a
lxc.cap.drop:
lxc.cgroup2.devices.allow: c 10:200 rwm
lxc.mount.entry: /dev/net/tun dev/net/tun none bind,create=file

After that, restart the container.