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Ability to configure Docker daemon options #92

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Ability to configure Docker daemon options #92

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Ability to configure Docker daemon options
Rickkwa Oct 8, 2018
0df75ae
Capitalize 'docker' in the task name
Rickkwa Oct 9, 2018
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7 changes: 7 additions & 0 deletions README.md
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Expand Up @@ -52,6 +52,13 @@ Docker Compose installation options.

A list of system users to be added to the `docker` group (so they can use Docker on the server).

docker_daemon_options:
storage-driver: "devicemapper"
log-opts:
max-size: "100m"

Custom `dockerd` options can be configured through this dictionary representing the json file `/etc/docker/daemon.json`.

## Use with Ansible (and `docker` Python library)

Many users of this role wish to also use Ansible to then _build_ Docker images and manage Docker containers on the server where Docker is installed. In this case, you can easily add in the `docker` Python library using the `geerlingguy.pip` role:
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3 changes: 3 additions & 0 deletions defaults/main.yml
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Expand Up @@ -27,3 +27,6 @@ docker_yum_repo_enable_test: 0

# A list of users who will be added to the docker group.
docker_users: []

# Docker daemon options
docker_daemon_options: {}
12 changes: 12 additions & 0 deletions tasks/main.yml
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Expand Up @@ -17,6 +17,18 @@
state: "{{ docker_service_state }}"
enabled: "{{ docker_service_enabled }}"

- name: Ensure /etc/docker/ directory exists.
file:
path: /etc/docker
state: directory
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The last thing I'd like to make sure to do is not touch the file if the default (docker_daemon_options: {}) is set.

That way (a) existing role users won't have that file wiped out if it currently contains things and they update the role, and (b) people can manage the file on their own simply by not setting the option in this role's vars.


- name: Configure Docker daemon options.
copy:
content: "{{ docker_daemon_options | to_nice_json }}"
dest: /etc/docker/daemon.json
mode: 0644
notify: restart docker

- name: Ensure handlers are notified now to avoid firewall conflicts.
meta: flush_handlers

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