services:
 db:
  image: codenvy/mysql               // Base image
  environment:
   MYSQL_USER: petclinic
   MYSQL_PASSWORD: password
  mem_limit: 2147483648              // Memory used by the machine
  command: [service, mysql, start]   // Execute “service mysql start”
  volumes_from: dev-machine          // Share a volume mount from ‘dev-machine’


 dev-machine:
  image: codenvy/ubuntu_jdk8
  mem_limit: 2147483648
  expose: 3000                       // Expose port 3000
  depends_on:
    - db