Ansible Playbook中的微小更改不会在目标主机中更新

Question

My playbook is (among other things) starting a docker container:

- name: Restart nginx container
  docker:
    name: nginx
    image: my-nginx
    state: started
    ports:
    - "{{ nginx_port }}:80"
    volumes:
    - "{{ host_socket }}:{{ container_socket }}"

This is correctly starting the container. But if I decide I need to run nginx in another port, and run again the playbook, the container is not restarted. It seems that ansible is happy with the container being up and running, but does not verify if the rest of parameters are right.

I see two options here:

1. force a restart whenever I run the playbook, no conditions asked, so that I make sure that the latest configuration is active. I do not like this because most of the time the parameters do not change.
2. force ansible to be more accurate and check all parameters, restarting the container if whatever value has changed. I am not sure there is such an option.

How can I tell ansible to be more accurate when checking the state of the container?

Answer 1

The docker module is deprecated, I assume it must be one of its issue.

Did you try the docker_container module ? You will need ansible > 2.1.0 but I think it's worth a try.

Answer 2

It seems that ansible is happy with the container being up and running, but does not verify if the rest of parameters are right.

Yes, because you specified state: started , and that's explicitly what that means:

"started" asserts that the matching containers both exist and are running, but takes no action if any configuration has changed.

You probably want reloaded instead:

"reloaded" (added in Ansible 1.9) asserts that all matching containers are running and restarts any that have any images or configuration out of date.