LXC Ubuntu 16.04

https://tutorials.ubuntu.com/tutorial/tutorial-setting-up-lxd-1604#2

There are two repositories -    images repository  and  ubuntu repository
lxc image list images:
lxc image list ubuntu:
https://www.youtube.com/watch?v=snWp-5K2LO4
lxc exec first -- /bin/bash
sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to [DestinationIP:PORT]
iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 587 -j DNAT \
    --to-destination 10.0.3.100:587