🌐

Networking

🚀 Deployed

About

This page will explain how I use docker networking in my apps.

With Docker standalone

My docker networking is pretty straight forward tbh. I use a single network called homelab using the docker bridge driver_._

Creating the network

Run the following command :

docker network create -d bridge homelab

Using the network

In a run command add following arg :

docker run [...] --network=homelab

Using docker-compose :

version: "3"
services:
  app:
    # ...
    networks:
      - homelab

networks:
  homelab:
    external: true

Comments

By default docker resolve hostname using the container name but specifying one can be done as follow :

In a docker run command : --hostname=[container-name]
In a docker-compose file : hostname: [container-name]

With Docker swarm

We do use a same homelab network for all our services but first we need to adjust a few things. Indeed, since we’re using Tailscale between our nodes, we need to adjust the MTU of the network to corresponds to Tailscale one (1280).

Creating the network

First let’s delete the default ingress network

docker network rm ingress

Then we create it but with the good MTU, along with the homelab network :

docker network create -d overlay --ingress --opt com.docker.network.driver.mtu=1280 ingress
docker network create -d overlay --attachable --opt com.docker.network.driver.mtu=1280 homelab

Using the network

Now we can use it anywhere in our stacks like so :

version: "3"
services:
  app:
    # ...
    networks:
      - homelab

networks:
  homelab:
    external: true