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Q: Docker container joining existing network with fixed ip (via docker compose) (self.selfhosted)

submitted 2 years ago by Solvena to c/selfhosted

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Hi, I figured out how to get docker containers to join an existing network with putting "networks" into the respective sections of the docker-compose.yml

If I want to also give them fixed ip's on this network, what would the syntax look like in the docker-compose.yml?

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[–] ChrislyBear 8 points 2 years ago (3 children)

I have never cared about the IP addresses of my docker containers and never will.

Why do you? There is a docker internal DNS, you can just resolve IPs by service name/container_name.

[–] [email protected] 3 points 2 years ago (2 children)

There is a docker internal DNS, you can just resolve IPs by service name/container_name.

Yes, and you can also control that as well by messing with docker network groups. I find the ability to network into docker servers from the host to be super simple.

What I haven't figured out yet is whether or not I can give my docker services their own IP on my router for access from another system on a fixed or reserved IP.

[–] NewDataEngineer 1 points 2 years ago* (last edited 2 years ago)

What I haven’t figured out yet is whether or not I can give my docker services their own IP on my router for access from another system on a fixed or reserved IP.

You can. You have to set up a macvlan on your network and then assign an IP to your container that sits on your router's subnet.

I can only use traefik with a macvlan because Synology DSM uses ports 80 and 443. I assign traefik its own IP and use pihole's DNS to route wildcard subdomain to it.

I wrote a guide in my trillium notes. If you're interested I can share.

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