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How to get a unique MAC/DHCP IP for a Docker/Podman container without MACVLAN? (lemmy.blahaj.zone)
submitted 1 year ago by glizzyguzzler@lemmy.blahaj.zone to c/selfhosted@lemmy.world
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I have a bridge device set up with systemd, br0, that replaces my primary ethernet eth0. With the br0 bridge device, Incus is able to create containers/VMs that have unique MAC addresses that are then assigned IP addresses by my DHCP server. (sudo incus profile device add <profileName> eth0 nic nictype=bridged parent=br0) Additionally, the containers/VMs can directly contact the host, unlike with MACVLAN.

With Docker, I can't see a way to get the same feature-set with their options. I have MACVLAN working, but it is even shoddier than the Incus implementation as it can't do DHCP without a poorly-maintained plugin. And the host cannot contact the container due to the MACVLAN method (precludes running a container like a DNS server that the host server would want to rely on).

Is there a way I've missed with the bridge driver to specify a specific parent device? Can I make another bridge device off of br0 and bind to that one host-like? Searching really fell apart when I got to this point.

Also, if someone knows how to match Incus' networking capability with Podman, I would love to hear that. I'm eyeing trying to move to Podman Quadlets (with Debian 13) after I've got myself well-versed with Docker (and its vast support infrastructure to learn from).

Hoping someone has solved this and wants to share their powers. I can always put a Docker/podman inside of an Incus container, but I'd like to avoid onioning if possible.

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[–] MangoPenguin@lemmy.blahaj.zone 2 points 1 year ago (1 children)

What about using the default docker bridge networking instead of macvlan? You can access docker containers from the host, they can talk to each other if on the same bridge network, and there's nothing hardcoded into the docker compose files.

[–] glizzyguzzler@lemmy.blahaj.zone 1 points 1 year ago (1 children)

With the default Docker bridge networking the container won’t have a unique IP/MAC address on the local network, as far as I am aware. Communication with external clients will have to contact the host server’s IP at the port the container is tied to in order to interact. If there’s a way to specify a specific parent interface, let me know!

[–] MangoPenguin@lemmy.blahaj.zone 1 points 1 year ago

Thats correct but that is fine for the majority of setups.