Docker Compose

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Author

• Kamil Baran

Docker Compose Installation

<syntaxhighlight lang="Bash"> $ sudo -i $ curl -L https://github.com/docker/compose/releases/download/1.26.2/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose $ chmod +x /usr/local/bin/docker-compose $ curl -L https://raw.githubusercontent.com/docker/compose/$(docker-compose version --short)/contrib/completion/bash/docker-compose > /etc/bash_completion.d/docker-compose $ exit $ docker-compose --version </syntaxhighlight>

• more info: docs.docker.com/compose/install

Wordpress Example

Start Wordpress without Docker Compose

To start a Wordpress site in containers, you need to complete following steps:

1. create custom network for the application
2. create volume for database container
3. create volume for web server container
4. create database container
5. create web server container

The commands below represents an example of all required steps: <syntaxhighlight lang="Bash"> $ docker network create wordpress_net $ docker volume create wordpress_mysql_data $ docker volume create wordpress_html $ docker run -d --name wordpress_mysql --network wordpress_net -v wordpress_mysql_data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=NobleProg -e MYSQL_DATABASE=wordpress -e MYSQL_USER=wordpress -e MYSQL_PASSWORD=wordpress mysql:5.7 $ docker run -d --name wordpress_apache --network wordpress_net -v wordpress_html:/var/www/html -p 80:80 -e WORDPRESS_DB_HOST=wordpress_mysql:3306 -e WORDPRESS_DB_USER=wordpress -e WORDPRESS_DB_PASSWORD=wordpress wordpress:php7.2-apache </syntaxhighlight>

When you want to delete your Wordpress site completely you need to remove containers, volumes and network by executing following commands: <syntaxhighlight lang="Bash"> $ docker container rm -f wordpress_mysql wordpress_apache $ docker volume rm wordpress_mysql_data wordpress_html $ docker network rm wordpress_net </syntaxhighlight>

Start Wordpress with Docker Compose

Docker Compose allows you to manage your multi-container applications by running a straightforward command. For example, to start, stop and remove Wordpress site, you need to execute following commands accordingly: <syntaxhighlight lang="Bash"> $ docker-compose up -d $ docker-compose stop $ docker-compose down --volumes </syntaxhighlight>

There are only a few things you need to do before you can start Wordpress site by using Docker Compose:

1. Install Docker Compose (usually it's not installed with Docker)
2. create a docker-compose.yml (or .yaml) in an empty directory containing following content
3. run above commands in the same directory where the docker-compose.yml file is located (or use -f option to specify a path to the file).

<syntaxhighlight lang="yaml"> version: '3' services:

 mysql:
   image: mysql:latest
   volumes:
   - mysql_data:/var/lib/mysql
   environment:
   - MYSQL_ROOT_PASSWORD=NobleProg
   - MYSQL_DATABASE=wordpress
   - MYSQL_USER=wordpress
   - MYSQL_PASSWORD=wordpress
   networks: 
   - net
 apache:
   depends_on:
   - mysql
   image: wordpress:latest
   volumes:
   - html:/var/www/html
   ports:
   - 80:80
   environment:
   - WORDPRESS_DB_HOST=mysql:3306
   - WORDPRESS_DB_USER=wordpress
   - WORDPRESS_DB_PASSWORD=wordpress
   networks:
   - net

volumes:

 mysql_data:
 html:

networks:

 net:

</syntaxhighlight>

Mongo Counter Example

• create an empty directory called mc-app
• copy content from httpd (Dockerfile and html directory) and mongodb (Dockerfile) directories created previously
• create a docker-compose.yml file containing below configuration

<syntaxhighlight lang="Bash"> version: '3' services:

 httpd:
   build: ./httpd
   image: kamilbaran/training:httpd
   network_mode: host
 mongo:
   build: ./mongo
   image: kamilbaran/training:mongo
   network_mode: host

</syntaxhighlight>

• in order to build all images at once and start entire application run below command

<syntaxhighlight lang="Bash"> $ docker-compose up --build -d </syntaxhighlight>

• more information about options available in docker-compose files: docs.docker.com/compose/compose-file