Docker-Compose file has yaml.scanner.ScannerError

Question

compose.yml file, which looks like this:

version: \'2\'
services:
  discovery-microservice:
    build: discovery-microservice
      context: /discov         


        

Answer 1

Bringing my answer because while I got the same error message, my solution was different.

Original docker-compose.yml

volumes: mongo:

After trying all the ideas in this thread I just went to the docker-compose docks and realized that volumes should be structured like:

volumes:
  mongo:

That's it for anyone else running into this.

Answer 2

Check your whitespaces by validating your YAML input.

I spent 1hour to find out.

Answer 3

I found that missing one ":", was enough to produce the above error

Answer 4

And I forgot : after version

version '2'

Answer 5

Hi further update to the given answer .... It's not specifically about the version: '2.0' line The statement

ERROR: yaml.scanner.ScannerError: mapping values are not allowed here

means there's a formatting error of some sort.

I got it and it was because I was missing a tab in my docker-compose file

version: '3.0'
services:
  mysql:
  image: ...

instead of

version: '3.0'
services:
  mysql:
    image: ...

Note the lack of an indenting tab on the image line