Docker Mongo Replica Set with support for auto-scaling. The service discovery is provided through DCHQ's plug-in framework. The service discovery framework in DCHQ provides event-driven life-cycle stages that executes custom scripts to re-configure application components. This is critical when scaling out clusters for which a load balancer may n…

Docker Mongo Replica Set

mongo_rs1_srv1:
  image: mongo:latest
  mem_min: 400m
  publish_all: true
  command: --replSet rs1
  environment:
    # inject clustered node ips
    - MONGO_RS1_SRV2_IP={{mongo_rs1_srv2|container_private_ip}}
    # The above mapping will insert comma separated ip list e.g. 10.1.1.1,10.1.12
  plugins:
    - !plugin
      # This plugin initializes the Replica Set
      lifecycle: on_create
      id: QX25F
    - !plugin
      # This plug-in re-balances the Replica Set post scale out
      lifecycle: post_scale_out:mongo_rs1_srv2
      id: sxKM9
    - !plugin
      # This plug-in re-balances the Replica Set post scale in
      lifecycle: post_scale_in:mongo_rs1_srv2
      id: YIALH
# Define this node as clustered
mongo_rs1_srv2:
  image: mongo:latest
  mem_min: 400m
  cpu_shares: 1
  cluster_size: 2
  command: --replSet rs1