Give an lxc container an external ip address

https://www.techrepublic.com/article/how-to-set-up-a-bridge-for-lxd-containers/

Once the bridge is set up run this:

lxc launch images:centos/8 cent8
lxc list
lxc config device add cent8 eth0 nic nictype=bridged parent=br0 name=eth0
lxc list
lxc exec cent8 – /bin/bash
lxc list
lxc stop cent8
lxc start cent8

Example of netplan file on host server

# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
  version: 2
  renderer: networkd
  ethernets:
    enp2s0:
     dhcp4: no
#    addresses: [192.168.0.17/24]
#     gateway4: 192.168.0.1
#     nameservers:
#       addresses: [8.8.8.8,8.8.4.4]
#     routes:
#     - to: 10.8.0.0/24
#       via: 10.8.0.74
 
  bridges:
      br0:
          interfaces: [enp2s0]
          addresses: [192.168.0.17/24]
          gateway4: 192.168.0.1
          mtu: 1500
          nameservers:
            addresses: [8.8.8.8]
          parameters:
                stp: true
                forward-delay: 4