Create Your Own Application with Docker Compose

These days I had a Quick glimpse at Docker Compose and created a docker-compose.yml for planets right away.

Let's start with creating the infrastructure services first:

mongodb:
  image: planets/mongodb
  ports:
    - "27017"

There are only two things we configure in this snippet: The image and the ports.

The next snippet adds links and environment variables to the mix:

server:
  image: planets/server
  ports:
    - "8080"
  links:
    - mongodb
  environment:
    - SPRING_PROFILES_ACTIVE=prd
homepage:
  image: planets/homepage
  ports:
    - "28080:8080"
  links:
    - server
  environment:
    - SPRING_PROFILES_ACTIVE=prd

The ports decleration of the service homepage is a bit different (28080:8080) which means the WWW port is exposed to the outside world as 28080. In the previous examples the port was only available to other containers using a link.

Change into the directory that contains your docker-compose.yml and fire up the application with a single command:

$ docker-compose up

Update the whole application:

$ docker-compose stop -t 30
$ docker-compose pull
$ docker-compose up -t 30 -d

Nice addition in the Docker universe...

Per default the containers are prefixed with the directory name where the Docker compose file is located. If you want to change the prefix you can add -p <prefix> to your compose commands.

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