service module fails to start nginx usig a docker connection

[Ruben Decrop]

I am using ansible to manage a group of Docker containers, using docker_connection.

All goes well unitl I am instructing nginx to be started in the container using this snippet

- name: ensure nginx started

 service:

    name: nginx

    state: started

No error message is given but nginx is not started in the container

If I replace it by

- name: ensure nginx started

 command: service nginx start

it gives a warning to consider using the service module, but it works.   Am I doing somethnig wrong, or is this a kind of weird bug?

[Varun Chopra]

Run both using -vvvv and post the outputs here.