Gathering Facts About Docker Containers

Facts are the bread and butter of how Ansible works and manages information about its controlled/automated systems. Facts represent data about the device and the current state. Ansible provides a set of playbook tasks that can be readily leveraged to gather facts about Docker images. Let's take a look at a couple of examples of how to accomplish this.

This is example 1:

- name: Inspect a single Docker image
 docker_image_facts:
 name: foo/centos-7

This is example 2:

- name: Inspect multiple Docker images
 docker_image_facts:
 name:
 - foo/centos-7
 - sinatra

The preceding playbook tasks inspect a single or multiple Docker image setup and report the facts. The fact data itself is stored in the return value. An example of the output is provided as follows:

[{'Container': 'e83a452b8fb8ff43oj094j4050131ca5c863629a47639530d9ad2008d610', 'Name': 'registry:2', 'Author': '', 'GraphDriver': {'Data': None, 'Name': 'aufs'}, 'Architecture': 'amd64', 'VirtualSize': 165808884...