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From NixNet
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== LXD Networking ==
{{Note|Ignore all of the IPv6-related steps; this leads to a broken IPv6 configuration! We're working on fixing our setup and will update these docs once we've figured out the issues.|warn}}
Before setting any static IPs, you need to enable stateful DHCPv6 on LXD's virtual NIC. For more info about why, see [https://discuss.linuxcontainers.org/t/lxd-ipv6-networking-questions-novice/6961/2 a related thread on LXC's Discouse insance].
<pre>
lxc network set lxdbr0 ipv6.dhcp.stateful true
</pre>
To bind a container to a host port with NAT, you first need a static IP on the container:
<pre>
lxc network attach lxdbr0 <instance> eth0 eth0
lxc config device set <instance> eth0 ipv4.address=<container-ip> ipv6.address=<container-ip>
</pre>
Then the proxy device needs to be added:. Note the square brackets <code>[]</code> surrounding the IPv6 address in the second command.
<pre>
lxc config device add <instance> port-forward forward_ipv4 proxy connect=tcp:<container-ip>:<port> listen=tcp:<host-public-ip>:<port> nat=truelxc config device add <instance> port-forward_ipv6 proxy connect=tcp:[<container-ip>]:<port> listen=tcp:[<host-public-ip>]:<port> nat=true
</pre>
This adds a device of type disk to <code><container-name></code>. The <code>source</code> is the host's file path, and <code>path</code> is the path in the container.
Do Due to how permissioning works on unprivileged containers, the mount permissions have to be changed on the host system. Firstly you have to know what gid/uid offset LXD is using for it's containers. In the case of NixNet's setup, the containers are on an offset of 100000, which means the root user in the container has the permissions of user 100000 on the host system.
The next step is to get the uid/gid of the user that needs to access the mounted files in the container. To get this, simply run <code>id <user></code> on the user.