Configure Docker using Ansible

3 min readDec 16, 2020

I completed Task1 of ansible training given by World Record Holder Mr. Vimal Daga Sir at LinuxWorld Informatics Ltd Pvt.

Problem Statements

❗ Ansible 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 web server

Additional task for DevOps AL and Hybrid Multi Cloud trainees:

🔹 Configure a Kubernetes Cluster having master and slave nodes

🔹 Do the above implementation as Deployment in the Kubernetes Cluster

Prerequisites

Ansible installed at Controller Node
Connectivity Between Controller Node and Managed Node
Managed Node must have the docker-py python module

Approach

I Used two VM of RHEL 8, one(IP 192.168.43.2 work as controller/manager node, ) another one (IP 192.168.43.239, managed node). I make this managed node as a group “web”.

I have done this task steps wise:-

Step 1

-> Inventory File (for managed node/ web group):-

Step2

-> Create Playbook:-

- name: configure yum for docker, and install in webserver host
  hosts: web // my managed node 
  vars_prompt:  // create variable with take input from user
   - name: dnsip
     prompt: "Enter the your DNS ip "
     private: no
  tasks:
    - name: copy the dns conf file  // configure dns
      template:
        src: dns.conf
        dest: /etc/resolve.conf
      register: x
      ignore_errors: yes
     
    - name: add docker repo file   // add a repo at  managed node for docker
      yum_repository:
        name: docker
        description: docker repo 
        baseurl: https://download.docker.com/linux/centos/7/x86_64/stable/
        gpgcheck: no
      register: y
    - name: status of add docker repo
      debug: 
       var: y
    - name: install docker software //install docker s/w
      package:
        name: "docker-ce-18.09.1-3.e17.x86_64"
        state: present
      register: z
      when: x.failed == false
      when: y.failed == false 
    - name: status of install docker software
      debug:
       var: z
    - name: start the docker service  //start the docker service
      service: 
        name: "docker"
        state: started
        enabled: yes
      register: a
      when: z.failed == false
      
    
    - name: copy the webpage from CN to webserver // copy webpage
      copy:
        src: "index.html"
        dest: "/root/home/"
      ignore_errors: yes
    - pip: //python module 
       name: docker-py
    - name: pull the image from docker hub // pull image
      docker_image:
        name: "aju121/myweb:latest"
        source: pull
      register: b
    - name: status of pull the image
      debug:
       var: b
    - name: launch the conatiner for hosting the webpage //create container
      docker_container:
         name: "ajayOS"
         image: "aju121/myweb:latest"
         state: started
         ports:
           - "88:80"
         volumes:
            - /root/home/:/var/www/html/
         
    - name: Final Result
      debug:
        msg: "Successfully configured docker , launch container and hosting my webserver"
      when: x.failed == false