How to configure custom docker compose network

[robot-ranger]

Hello,

I need to setup a custom docker network, but I cant figure out how to 'attach' it to the docker0 an interface.

I am launching my services from a docker compose file, and the services launch fine. However, openWrt seems to make a unique bridge br-xxxyyyzzz each time the compose is brought up. The name of the bridge appears to be a unique hash and is constructed/deconstructed on up/down, so i cannot simply add it ito the docker0 bridge because its name will be different next time.

How do we setup a custom docker network in openWrt?

[brada4]

Hi, you have to pre-init empty_bridge called docker0, then dockerd adapts it as docker bridge.

[robot-ranger]

docker0 bridge is already there.

problem is the default docker bridge doesnt support DNS for inter-container communication. ( see here: https://docs.docker.com/network/drivers/bridge/#differences-between-user-defined-bridges-and-the-default-bridge)

...so... I need to create a custom network in order for one container to connect to another by its docker-compose service name.

[robot-ranger]

i can create a docker network with either cli or luci, but I dont see any options to assign it to a "parent interface", as the default one is:

When i run docker compose up, docker creates a new network for my compose stack as expected, but its completely inaccessible because i cannot add it to a firewall zone (because it doesnt have a parent interface that luci can assign to a zone?)

[robot-ranger]

With the help of the following links:

OpenWrt with Docker & Docker-Compose - Network

Having fought with this on openwrt: What i did: Dockers default bridge should only be used for testing purposes and really you should create your own named bridge interface - the reason it defaults to creating a new docker interface. Official docker docs do say that! You can do this by cli or gui, but doing via cli is easier as you need to set some options for it to work correctly on openwrt i.e "com.docker.network.bridge.enable_icc": "true", "com.docker.network.bridge.enable_ip_masquerade"…

Bridge network driver

Networking in Compose

I got it to work with the following:

1. add a custom network to my docker-compose.yml file. They key is com.docker.network.bridge.name: docker1 (name it whatever you want i suppose):

networks:
  mxi_default:
    name: mxi_default
    driver: bridge
    driver_opts:
      com.docker.network.bridge.name: docker1

2. add an interface in luci, covering the device1 specified in com.docker.network.bridge.name: docker1 from docker-compose.yml:
   

   

3. add the new interface to docker firewall zone: