Dockers

Dockers 101 – Series 3 of N – Using Docker-Compose.yml and Docker-Compose to Setup a WordPress Site

Requirement: To  setup a WordPress website using docker-compose.yml and docker-compose Strategy: Docker uses a docker-compose.yml to define the orchestration. docker-compose is an orchestration tool which uses the docker-compose.yml to setup multiple […]

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Mohd Naeem
  • Requirement:
    • To  setup a WordPress website using docker-compose.yml and docker-compose
  • Strategy:
    • Docker uses a docker-compose.yml to define the orchestration.
    • docker-compose is an orchestration tool which uses the docker-compose.yml to setup multiple containers.
    • For above requirement we need the following:
      • WordPress is a multi tier application with a front-end, business layer and a database back-end.
      • One of the features of docker is single responsibility principle. So these multiple layers will be represented by multiple images and containers
      • Install docker-compose and setup the file docker-compose.yml
  • Solution:
    • Login to your Host machine(in my case a CentOS 7 machine)
    • Make a directory “TicTackToe” and go to the directory – mkdir mywordpress && cd mywordpress
    • Now setup and define images and configuration in the docker-compose.yml- nano docker-compose.yml
    • Copy following content into the file and save:
    • Explanation of the code:
      • Download the docker-compose.yml from here – https://testbucket786786.s3.amazonaws.com/docker/docker-compose.yml
      • Capture
      • docker-compose use some terms to define the configuration
      • services: it user service keyword to define services
        • the file defines two services
          • db for database image settings
            • image: mysql:5.7
            • volume for database volumes : /var/lib/mysql
            • restart: always
            • and then environment settings like database, username, password and root password.
          • wordpress for wordpress settings
            • depends on db means that wordpress service is dependent db service to be ready first
            • image: wordpress:latest
            • ports: “8000:80” means 8000 is host port “port forwarding” to port 80 of container
            • and then environment settings like host, user, password
      • volumes: it user columes keyword to define volumes to be used and attached in the configuration
      • networks: it user networks keyword to define network settings
    • Install docker-compose tool
      • execute these commands:
      • sudo curl -L https://github.com/docker/compose/releases/download/1.20.1/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-composesudo chmod +x /usr/local/bin/docker-composeexport PATH=${PATH}:/usr/local/bin
      • check if docker-compose is installed
        • docker-compose –version
    • Capture
    • Build the project – docker-compose up -d
    • Below is the output of the command
    • Capture
    • Lets access the website:
      • Yay!!!, WordPress is up.
      • Since my DNS name is liek this tahts why I am running with DNS name : http://mnaeemsiddiqui3.mylabserver.com:8000
      • You can either use your DNS name like : http://yourDNSwebsite:8000 or http://localhost:8000 if you are running locally.
      • Capture