𝐀𝐏𝐀𝐂𝐇𝐄 𝐖𝐄𝐁𝐒𝐄𝐑𝐕𝐄𝐑 𝐂𝐎𝐍𝐅𝐈𝐆𝐔𝐑𝐀𝐓𝐈𝐎𝐍 𝐈𝐍 𝐃𝐎𝐂𝐊𝐄𝐑 𝐔𝐒𝐈𝐍𝐆 𝐀𝐍𝐒𝐈𝐁𝐋𝐄

Rohit Raut

3 min readNov 28, 2020

Ansible

About Ansible, Architecture, 𝐇𝐨𝐰 𝐓𝐨 𝐈𝐧𝐬𝐭𝐚𝐥𝐥 𝐚𝐧𝐝 𝐂𝐨𝐧𝐟𝐢𝐠𝐮𝐫𝐞 𝐀𝐧𝐬𝐢𝐛𝐥𝐞 explained in the below article.

What is Ansible,𝐇𝐨𝐰 𝐓𝐨 𝐈𝐧𝐬𝐭𝐚𝐥𝐥 𝐚𝐧𝐝 𝐂𝐨𝐧𝐟𝐢𝐠𝐮𝐫𝐞 𝐀𝐧𝐬𝐢𝐛𝐥𝐞

rohitraut3366.medium.com

Docker

About docker and manul process of installation of docker but in this article, we will automate it using Ansible.

What is docker and How To Install Docker On CentOS 8/RHEL 8

rohitraut3366.medium.com

The play-book is uploaded to the Github repository and a link is provided at the end of this article.

ANSIBLE PLAYBOOK AND AD HOC COMMANDS

ad hoc commands can run a single, simple task against a set of hosts in inventory hosts. The real power of ansible understands using playbook we have to configure infrastructure on multiple servers. The playbook is a text file written in YAML format and saved using yml extension.it is easy to read, write and understand.

The playbook can consist of multiple plays and each play is an ordered set of tasks run against hosts from the inventory file to reach the desired state of a managed node.

Description:

⭐Configure yum for docker.

⭐ Install Docker.

⭐ Start and enable Docker services.

⭐ Pull the httpd server image from the Docker Hub.

⭐Run the docker container and expose it to the public.

⭐ Copy the HTML code and start the webserver.

Pre-requisite:

Ansible should be installed in Node and this node is called a Controller Node. for installation refer the above article.

To see the version of ansible installed

ansible --version

List of Hosts in the inventory file.

Ansible Configuration File

Let’s Start

Configure Yum for docker

- hosts: all
  tasks:
      - name: "Configuring yum for docker software"
        yum_repository:
             file: "docker_repo"
             baseurl: "https://download.docker.com/linux/centos/7/x86_64/stable/"                                                                                   
             name: "docker"
             gpgcheck: no
             description: "docker repo"

Docker Installation

- name: "Docker Installation"
  package:
      name: "docker-ce-18.09.1-3.el7.x86_64"
      state: present

Starting Docker Service

- name: "Starting Docker service"
  service:
       name: "docker"
       state: started
       enabled: yes

Installing Python3

- name: "Installing Python3"
  package:
      name: "python3"
      state: present

Installing docker-py

To perform docker operation behind the scene Ansible uses docker SDK

To Install Docker SDK:

- name: "Installing docker SDK"
  pip:
      name: "docker-py"
      state: present

Creating a WebPage Directory in managed Node

- name: "Creating directory In managed Node"
  file:
      path: "/root/webpages"
      state: directory

Copy Webpages to Directory

- name: "Copy webpages to directory"
  copy:
     src: "/root/Ansible_playbooks/docker-webserver/webpages/index.html"
     dest: "/root/webpages"

Pulling HTTPD Image From Docker Hub

- name: "Pulling HTTPD Docker Container Image"
  docker_image:
      name: "httpd"
      source: pull
      state: present

Adding rules to the firewall

- name: "Adding firewall rule"
  firewalld:
      immediate: yes
      permanent: true
      port: "8081/tcp"
      state: enabled- name: "Masquerade"
  firewalld:
      masquerade: enable
      zone: public
      state: enabled
      permanent: yes

Restart Firewall

- name: "firewall restart"
  service:
      name: "firewalld"
      state: restarted

Launching Docker container

- name: "Launch httpd container"
  docker_container:
       name: "Webserver"
       image: "httpd"
       ports:
         - "8081:80"
       state: started
       volumes:
          - /root/webpages:/usr/local/apache2/htdocs/