Configuring Docker through Ansible
Docker is an open platform for developing, shipping, and running applications. Docker enables you to separate your applications from your infrastructure so you can deliver software quickly.
It is a containerization engine that helps us to launch docker containers from the docker images that are available in docker hub. Docker hub is a registry for docker images and there we can download and upload docker images. Docker images of various OS are available and many customized docker images can be made and upload onto Docker hub. Customized docker images can be made either by commit command or the best way to make docker images is through Dockerfile which helps is to customize docker images in a better and faster way.
Ansible is automation tool which helps us to orchestrate any of the IT work. Ansible is agentless i.e. this does not needed to be installed on the managed node and only controller node needs to be having ansible installed.
This task is all about installing docker through ansible and starting docker services in managed node. Also we are downloading httpd docker image which is official apache webserver docker image for launching apache on container
Step 1: Adding docker repository in managed node
Step 2: Installing docker on managed node
Step 3: Starting docker
Step 4: Installing docker SDK for python3
Step 5: Creating container
Now this involves total of 5 steps and this is a small task only but Ansible helps us to automate all of this in one go and we don't need to do anything manually.
We need to run only one command that too from controller node and this will setup docker and run apache container in it. Multiple hosts can be managed simultaneously.
ansible-playbook docker.yml
