ambari-server/src/main/resources/stacks/HDP/2.6/kerberos_preconfigure.json

{
  "services": [
    {
      "name": "KNOX",
      "preconfigure" : true
    },
    {
      "name": "BEACON",
      "preconfigure" : true,
      "identities": [
        {
          "name": "beacon_server",
          "principal": {
            "value": "beacon/_HOST@${realm}",
            "type": "service",
            "local_username": "beacon"
          }
        }
      ],
      "configurations": [
          {
            "core-site": {
              "hadoop.proxyuser.beacon.groups": "*",
              "hadoop.proxyuser.beacon.hosts": "*",
              "hadoop.proxyuser.beacon.users": "*"
            }
        }
      ]
    }
  ]
}