Provisioning Docker Using Ansible.

Ansible & Docker Installation.

Ansible is an automation tool primarily used in configuration management.

In this tech article, i will try to install docker software on manage node and run a container image.

Pre- Requisites:

• 2 RHEL 8 OS running on Virtual Box. One OS will act as controller Node and other OS as Manage node. you can have as many as you wish.
• Install Ansible on Controller Node.
• Install python software.
• Knowledge of ansible modules.
• pip command understanding to install python library.

After initial environment setup is completed. Now, we will proceed with creating the ansible playbook to install Docker software and run a container.

Let me jot down the steps that needs to be executed.

STEP 1: Configure yum repository in manage node.

STEP 2: Install docker software on manage node.

STEP 3: Docker service set up and start service.

STEP 4: Install Docker python library.

STEP 5: Download the docker image from docker repository.

STEP 6: Run the docker container.

Module references:

Yum_repository.

Package.

command.

Service.

pip.

Docker_image

PLAYBOOK TO INSTALL DOCKER :

This simple playbook will configure yum repository, install docker and run a Apache web-server (httpd) in a container.

- hosts: docker
  tasks:
    - name: Configure yum Repository.
      yum_repository:
        name: DockerReporsitory
        baseurl: https://download.docker.com/linux/centos/7/x86_64/stable/
        description: docker Repository set up
        enabled: true
        state: present
        gpgcheck: no
    - name: Docker Installation.
      command: "yum install docker-ce -y --nobest"
    - name: Start the docker service post installation.
      service:
        name: "docker"
        state: "started"
    - name: Install docker python library.
      pip:
       name: docker-py
    - name: Get a docker image from docker repository.
      docker_image:
         name: "httpd"
         source: pull
    - name: The httpd image is downloaded. Now, run the container.
      docker_container:
            name: ApacheWebserver
            image: "httpd"