12_compose.md

Docker Lab: Orchestration

Instead of managing the containers with the docker command, you may use Docker Compose to handle them.

First, install the docker-compose command:

sudo apt-get install docker-compose

Docker Compose file

Previously we run:

docker run --name mariadb-container-with-existing-external-volume -v$(pwd)/datastore-mysql:/var/lib/mysql -it -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mariadb

and

docker run -itd --name php-app -p80:80 --link mariadb-container-with-existing-external-volume php-app

We now create a file called docker-compose.yml:

version: '2'

services:

  php-app:
    image: php-app
    ports:
      - '80:80'
    links:
      - mariadb-container-with-existing-external-volume

  mariadb-container-with-existing-external-volume:
    image: mariadb
    environment:
      - MYSQL_ROOT_PASSWORD=my-secret-pw
    volumes:
      - './datastore-mysql:/var/lib/mysql'

For each of the docker run commands, you add an entry under services, containing the appropriate options. The various options are described in the Compose file reference.

Having this file, you can run both containers with a simple command:

docker-compose up

Then again, check localhost/db.php in the browser.

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