openstack-manuals/doc/common/samples/server-scheduler-hints4.json

{
   "server":{
      "name":"server-1",
      "imageRef":"cedef40a-ed67-4d10-800e-17455edce175",
      "flavorRef":"1"
   },
   "os:scheduler_hints":{
      "build_near_host_ip":"192.168.1.1",
      "cidr":"24"
   }
}