A Stackfile for a load-balanced and horizontally scalable Wordpress with volume synchronization using btsync

lb-wordpress-btsync-mysql.yml

# The load-balancer, gets deployed anywhere
lb:
  image: 'tutum/haproxy:latest'
  links:
    - wordpress
  ports:
    - '80:80'
  restart: always
  roles:
    - global
    
# The MySQL DB, gets deployed to a node tagged as DB
# Change the default "password"
db:
  image: 'tutum/mysql:5.5'
  environment:
    - MYSQL_PASS=password
  restart: always
  tags:
    - db
    
# The horizontally scaling Wordpress
# Follows the every_node strategy, so that it automatically scales when new 
# nodes tagged as "wordpress" are deployed
# Change the default "password"
wordpress:
  image: 'tutum/wordpress-stackable:latest'
  deployment_strategy: every_node
  environment:
    - DB_NAME=wordpress
    - DB_PASS=password
    - DB_USER=admin
  links:
    - db
  restart: always
  tags:
    - wordpress
  volumes:
    - /app/wp-content

# The BitTorrent Sync service to keep /wp-content in sync across all WPs
# Also follows the every_node strategy, and it's deployed alongside 
# every wordpress container
btsync:
image: 'tutum/btsync:latest'
  deployment_strategy: every_node
  restart: always
  roles:
    - global
  tags:
    - wordpress
  volumes_from:
    - wordpress

does not seem to pass YML lint

this fork does pass YML check https://gist.github.com/lvnilesh/5ffd7df5a5bcdb54c178