Integration of Ansible tool with Docker

Ansible(RH294) Task 1:

Write an Ansible PlayBook that does the following operations in the managed nodes:

🔹 Configure Docker.

🔹 Start and enable Docker services.

🔹 Pull the httpd server image from the Docker Hub.

🔹 Run the httpd container and expose it to the public.

🔹 Copy the html code in /var/www/html directory and start the webserver.

Ansible:

Ansible is an open-source software provisioning, configuration management, and application-deployment tool enabling infrastructure as code. It runs on many Unix-like systems and can configure both Unix-like systems as well as Microsoft Windows. Wikipedia

Docker:

Docker is a set of the platform as service products that use OS-level virtualization to deliver software in packages called containers. Containers are isolated from one another and bundle their own software, libraries, and configuration files; they can communicate with each other through well-defined channels. Wikipedia

What is httpd?

The Apache HTTP Server, colloquially called Apache, is a Web server application notable for playing a key role in the initial growth of the World Wide Web. Originally based on the NCSA HTTPd server, the development of Apache began in early 1995 after work on the NCSA code stalled. Apache quickly overtook NCSA HTTPd as the dominant HTTP server and has remained the most popular HTTP server in use since April 1996.

Ansible playbook:

An Ansible playbook is an organized unit of scripts that defines work for a server configuration managed by the automation tool Ansible. Ansible is a configuration management tool that automates the configuration of multiple servers by the use of Ansible playbooks.

Pre-requisites:

1) Installation of Ansible:

In the RedHat8, Python3 is already installed. So, we have to install ansible on the top of python3. For installing the Ansible use the following command:

# pip3 install ansible

After that, You can check the version of Ansible, for the check whether ansible is installed properly or not!!

2) Configuration of Ansible:

A) In the /etc/myhosts.txt file we have created a group of the Managed Node Ip as a host in Controller Node. By this approach, we can control the automation that Node which is in the group. After the IP, give your username and password of that Managed Node.

B) Ansible works against multiple systems in your infrastructure at the same time. It does this by selecting portions of the systems listed in Ansible’s inventory file. You can specify a different inventory file using the -i <path> option on the command line. Not only is this inventory configurable, but you can also use multiple inventory files at the same time.

By using the following command you can the list of hosts you have:

We need to check, that all managed node is properly connected to the controller node or not. For that use the following command.

Now the setup of the Ansible is done here. So, we can go to the next step that is creating our own ansible-playbook. Ansible Support YAML language in the playbook. Hence I have created the docker.yml ansible-playbook.

1) Creating a yum repository for Docker:

2) Installing docker using package module:

3) Then, start and enable the docker service and install the python for the docker:

4) Creating the Directory and Copying the html file from the controller node to the managed node.

5) Creating a container using httpd image & expose the port.

Now run the following command for the running the ansible-playbook:

# ansible-playbook docker.yml

OutpuT:

After successfully running the playbook, you can check the docker status and HTML webpage:

Then search on the browser: Managed_Node_IP:8081/File_Name.html

• Check My GitHub Repository

Thanks for reading!