LXC – Disable DHCP

With regular LXC, I wasn't able to set the IP in the container config. The networking config format seems to have changed a few times, or across distros, and a lot of the solutions seem to refer to wrappers like LXD.

So instead, here's just the default way to manually configure the IPs within the container – it doesn't necessarily work that way in a distro from an ISO, but in the versions you'd get with lxc-create -t download.

netplan (Ubuntu)

/etc/netplan/10-lxc.yaml

network:
  version: 2
  ethernets:
    eth0:
      dhcp4: false
      addresses:
        - 192.168.122.114/24
      routes:
        - to: default
          via: 192.168.122.1
      dhcp-identifier: mac
      nameservers:
        addresses:
          - 192.168.122.31
          - 9.9.9.9

Apply with netplan apply.

systemd-networkd (Debian)

Debian uses systemd-networkd. This will also work on Ubuntu (and others, of course), if you disable or uninstall netplan.

/etc/systemd/network/eth0.network

[Match]
Name=eth0
 
[Network]
Address=192.168.122.57/24
Gateway=192.168.122.1
DNS=192.168.122.31