# Edit VM/LXC Configuration located at /etc/pve/lxc/XXX.conf
echo "lxc.cgroup.devices.allow: c 10:200 rwm" >> /etc/pve/lxc/XXX.conf
echo "lxc.mount.entry: /dev/net dev/net none bind,create=dir" >> /etc/pve/lxc/XXX.conf
mkdir /dev/net
curl -s https://install.zerotier.com | sudo bash
sudo zerotier-cli join longerrandomid
# Verify
sudo zerotier-cli status
sudo zerotier-cli listnetworks
sudo systemctl status zerotier-one.service
Additional references: