Ansible Playbook to launch a container and deploy a web application on it…
What is Ansible?
Ansible is a software tool that provides simple but powerful automation for cross-platform computer support. It is primarily intended for IT professionals, who use it for application deployment, updates on workstations and servers, cloud provisioning, configuration management, intra-service orchestration, and nearly anything a systems administrator does on a weekly or daily basis. Ansible doesn’t depend on agent software and has no additional security infrastructure, so it’s easy to deploy.
Because Ansible is all about automation, it requires instructions to accomplish each job. With everything written down in simple script form, it’s easy to do version control. The practical result of this is a major contribution to the “infrastructure as code” movement in IT: the idea that the maintenance of server and client infrastructure can and should be treated the same as software development, with repositories of self-documenting, proven, and executable solutions capable of running an organization regardless of staff changes.
What is Ansible-Playbook?
Playbooks are Ansible’s configuration, deployment, and orchestration language. They can describe a policy you want your remote systems to enforce or a set of steps in a general IT process. If Ansible modules are the tools in your workshop, playbooks are your instruction manuals, and your inventory of hosts is your raw material. At a basic level, playbooks can be used to manage configurations of and deployments to remote machines. At a more advanced level, they can sequence multi-tier rollouts involving rolling updates and can delegate actions to other hosts, interacting with monitoring servers and load balancers along the way. While there’s a lot of information here, there’s no need to learn everything at once. You can start small and pick up more features over time as you need them. Playbooks are designed to be human-readable and are developed in a basic text language. There are multiple ways to organize playbooks and the files they include, and we’ll offer up some suggestions on that and making the most out of Ansible.
Ansible Docs — https://docs.ansible.com/
What is 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. Developing apps today requires so much more than writing code. Multiple languages, frameworks, architectures, and discontinuous interfaces between tools for each lifecycle stage create enormous complexity. Docker simplifies and accelerates your workflow while giving developers the freedom to innovate with their choice of tools, application stacks, and deployment environments for each project.
Docker Docs — https://docs.docker.com/
What is Apache HTTP Server?
The Apache HTTP Server, colloquially called Apache, is a free and open-source cross-platform web server software, released under the terms of Apache License 2.0. Apache is developed and maintained by an open community of developers under the auspices of the Apache Software Foundation.
Apache HTTP Docs — https://httpd.apache.org/docs/
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.
Let’s begin our journey.
First lets set ansible.cfg file which will have list of managed nodes.
hosts.txt file :
Now ,let’s power up our Controller Node.
Playbook that we are going to use to set up the apache web server.
Check the web-application from managed node