Compose: Unsupported config option for services.networks: 'default', docker-compose version 1.8.1

[rcholic]

By following the examples in the documentation page, I have the following block in my docker-compose.yml file:

networks:
   default:
    driver: overlay

But when I try to do docker-compose build, I got this error:

Unsupported config option for services.networks: 'default'

What does this mean? the version of my docker-compose is 1.8.1 by the way. Thanks

[jamesabbottsmith]

I had the same error, using docker-compose 1.8.1. The problem was that I had not used a version 2 compose file. (Networking is unsupported in v1)

You may find this link helpful. https://docs.docker.com/compose/compose-file/#upgrading

[kabudu]

I've had the same issue and I'm using a version 2.1 compose file with docker-compose version 1.9.0, build 2585387

[charneykaye]

Fixed for me by following the installation instructions at Release 1.9.0 using what the docs there refer to as "the usual commands to install or upgrade Compose."

[kabudu]

@charneykaye By direct method I presume you mean compiling from source?

[moibelgal]

I got the same issue. I'm using docker compose 1.9.0 build 2585387 originally installed with Docker Toolbox (in Windows). I tried to pip uninstall then pip install again but it didn't work out.

[moibelgal]

Just figured it out for my case now: the top level 'networks' tag must be at the same level as 'services' which means no indentation.

[charneykaye]

@kabudu I'm referring to the 3rd paragraph of the docs here for Release 1.9.0, which includes an example of using "the usual commands to install or upgrade Compose."

[lmnogueira]

The correct way to use this configuration is like that:

version: '2'
networks:
  default:
    external:
      name: bridge
services:

The networks option need to be at the same level as services is.