proxmox

change node hostname

to change the node hostname:

• poweroff all VMs and containers
• ssh on node
• change the hostname on /etc/hostname and /etc/hosts
• reboot
• after reboot, the web interface will show the old name as "disconnected", and the new name appears
• ssh on 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 in 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.