How to build docker container using ansible
What is Docker?
The leading container platform that allows you to wrap your app, all of its dependencies, and library into a small executable bundle that can be run anywhere.
What is Ansible?
Ansible is an open-source DevOps tool that can help the business in configuration management, deployment, provisioning, etc. It is designed to automate system management tasks. Ansible “programs” are called plays and are a collection of tasks in a playbook. It uses the playbook to describe automation jobs, and the playbook uses a very simple language YAML.
How to build a Debian docker container using ansible-playbook?
Below basic directory structure of the ansible files.
docker_demo % ls -l
total 24
-rw-r — r — 1 root root103 Dec 2 20:10 Dockerfile
-rw-r — r — 1 root root597 Dec 2 20:27 build.yml
-rw-r — r — 1 root root 417 Dec 2 20:05 host
I have a Dockerfile, an Ansible inventory, and playbooks for working with the Ansible Docker image module.
Docker file
I am going to bring up Debian container and install cowsay package inside the container
docker_demo % cat Dockerfile
FROM debian
RUN apt-get update && apt-get install -y cowsay fortune
ENTRYPOINT [“/usr/games/cowsay”]
Inventory file
I am going to install the docker image using ansible locally, you can also update the inventory file for remote device support.
docker_demo % cat host
[var]
10.10.10.10 ansible_ssh_connection=local
Ansible Playbook
I am creating the directory in the tmp path, copy the docker file from the current directory to tmp directory and then build the docker file.
docker_demo % cat build.yml
— -
- hosts: all
connection: local
gather_facts: no
tasks:
- name: create build directory
file:
path: /tmp/demo-container
state: directory
owner: root
group: root
mode: ‘0755’
- name: copy Dockerfile
copy:
src: ./Dockerfile
dest: /tmp/demo-container/Dockerfile
owner: root
group: root
mode: ‘0644’
- name: build container image
docker_image:
build:
path: /tmp/demo-container
source: build
name: demo-container:v1.0
state: present
Running the playbook
Below the command to run the ansible playbook
docker_demo % sudo ansible-playbook -i host build.yml
PLAY [all] ****************************************************************************************************************************************************************
TASK [create build directory] *********************************************************************************************************************************************
ok: [10.10.10.10]
TASK [copy Dockerfile] ****************************************************************************************************************************************************
ok: [10.10.10.10]
TASK [build container image] **********************************************************************************************************************************************
[DEPRECATION WARNING]: The default for build.pull is currently ‘yes’, but will be changed to ‘no’ in community.general 2.0.0. Please set build.pull explicitly to the
value you need. This feature will be removed from community.general in version 2.0.0. Deprecation warnings can be disabled by setting deprecation_warnings=False in
ansible.cfg.
ok: [10.10.10.10]
PLAY RECAP ****************************************************************************************************************************************************************
10.10.10.10 : ok=3 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
You can see the docker image using below command
docker_demo % docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
demo-container v1.0 f21d3b8705d7 53 seconds ago 181MB
