For my blog post, 'Create Multi-VM Environment Using Vagrant and JSON' (http://wp.me/p1RD28-14c). JSON-based configuration file used by Vagrant to build (3) VMs. Project git repository located at: https://github.com/garystafford/multi-oracle-dev-vms.

nodes.json

{
  "nodes": {
    "apps": {
      ":node": "ApplicationServer-201",
      ":ip": "192.168.33.21",
      ":host": "apps.server-201",
      "ports": [
        {
          ":host": 2201,
          ":guest": 22,
          ":id": "ssh"
        },
        {
          ":host": 7709,
          ":guest": 7709,
          ":id": "wls-listen"
        }
      ],
      ":memory": 2048
    },
    "dbs": {
      ":node": "DatabaseServer-301",
      ":ip": "192.168.33.31",
      ":host": "dbs.server-301",
      "ports": [
        {
          ":host": 2202,
          ":guest": 22,
          ":id": "ssh"
        },
        {
          ":host": 1529,
          ":guest": 1529,
          ":id": "xe-db"
        },
        {
          ":host": 8380,
          ":guest": 8380,
          ":id": "xe-listen"
        }
      ],
      ":memory": 2048
    },
    "web": {
      ":node": "WebServer-401",
      ":ip": "192.168.33.41",
      ":host": "web.server-401",
      "ports": [
        {
          ":host": 2203,
          ":guest": 22,
          ":id": "ssh"
        },
        {
          ":host": 4756,
          ":guest": 4756,
          ":id": "apache"
        }
      ],
      ":memory": 1024
    }
  }
}