Molecule: Add custom nameserver to Docker container

[asg1612]

Issue Type

• Feature request

Molecule and Ansible details

ansible 2.4.2.0
molecule, version 2.7.0

• Molecule installation method: pip
• Ansible installation method: pip

Desired Behaviour

I need configure a custom nameserver into a docker container. (/etc/resolv.conf)
When I run a container manually, I insert the nameserver like this:

• sudo docker run --dns=192.168.1.100 -d nginx

How can I add the nameserver with molecule.yml file?

[dj-wasabi]

What you can do is, first updating the create.yml file by adding the following line:

dns_servers: "{{ dns_servers.links | default(omit) }}"

to the Create molecule instance(s) task.

In molecule.yml, you can use something like this:

  - name: my_host
    groups:
      - my_fancy_group
    image: milcom/centos7-systemd
    networks:
      - name: container
    dns_servers:
      - 192.168.1.100

When you execute a molecule test, the container(s) will be created with the dns option.

[retr0h]

Thanks @dj-wasabi

Or if you don't feel like setting through molecule.yml you can simply hard code it in create.yml. The whole point of create.yml was to provide flexibility to people to do things the way they felt best.

In the case for docker, we seem to be adding most settings to molecule.yml. However, the more complex drivers (ec2, gce, openstack) most of the create.yml woud be customized by the user.

[retr0h]

Also, feel free to submit a PR to add this functionality, so others may benefit.

[asg1612]

Thanks @dj-wasabi

It's works with a modification:
dns_servers: "{{ item.dns_servers | default(omit) }}"

I created a PR with the modification

I closed the issue wrongly