ceilometer/server/backend/mongodb.yml

parameters:
  ceilometer:
    server:
      database:
        engine: mongodb
        members:
        - host: ${_param:cluster_node01_address}
          port: 27017
        - host: ${_param:cluster_node02_address}
          port: 27017
        - host: ${_param:cluster_node03_address}
          port: 27017
        name: ceilometer
        user: ceilometer
        password: ${_param:mongodb_ceilometer_password}