This is a sample standalone cluster configuration from config.json:

"clusters": {
  "north": {
      "host":"localhost",
      "port":"8203"
  }
},

This is a sample composite cluster configuration from config.json (either active/passive or active/active):

"clusters": {
  "global": {
      "host":"localhost",
      "port":8201,
      "children": [ "west","east" ]
  },
  "east": {
      "host":"localhost",
      "port":"8202",
      "memberOf":"global"
  },
  "west": {
      "host":"localhost",
      "port":"8203",
      "memberOf":"global"
  }
},