====== 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) =====
<file yaml /etc/netplan/10-lxc.yaml [enable_line_numbers="true"]>
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
</file>

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.

<file ini /etc/systemd/network/eth0.network [enable_line_numbers="true"]>
[Match]
Name=eth0

[Network]
Address=192.168.122.57/24
Gateway=192.168.122.1
DNS=192.168.122.31
</file>