Deploying a Web Application with Ansible and Docker Compose

Introduction

In today's world, automating the deployment process is crucial for ensuring consistency, reliability, and speed. In this article we will walk through steps to automate the deployment of web application using Ansible and Docker Compose.

Prerequisites

• Ansible installed on control node.

• Docker and Docker Compose installed on your Target Servers.

Steps:

Step-1:

First we need to create an inventory.ini file in which we will define the hosts details where Docker and Docker Compose should be pre-installed.

[web_servers]
IP_address_of_target_servers1 ansible_user=your_username ansible_ssh_private_key_file=path/to/your/private/key
IP_address_of_target_servers2 ansible_user=your_username ansible_ssh_private_key_file=path/to/your/private/key

Step-2:

Here we need to write playbook.yml file which will include below steps.

• It will pull latest code from git repository.

• It will build and deploy Docker Compose services.

• It will check status of deployed application, whether its running or not.

---
- name: Deploy the application
  hosts: web_servers
  become: yes
  tasks:
    - name: Pull latest code from repository
      git:
        repo: 'your-git-url'
        dest: <path-of-webapp-code>
    - name: Build and deploy Docker Compose services
      command: docker-compose up -d
      args:
        chdir: <path-of-webapp-code>
    - name: Check application status
      uri:
        url: http://localhost:8000
        status_code: 200

Note:

Your Git repository should have docker-compose.yml file and webapp code so that it can install and check the status of services.

Step-3:

Now we need to give below command on control node where ansible is installed to deploy web application on target servers.

ansible-playbook -i inventory.ini playbook.yml