=== reverse DNS 172.20.0.1-40 ===
172.20.0.1 -> gateway
172.20.0.2 -> api-listener-jimiiot-push.api-v2
172.20.0.3 -> mongodb.api-v2
172.20.0.4 -> zookeeper.api-v2
172.20.0.5 -> redis.api-v2
172.20.0.6 -> c79bfe866f41
172.20.0.7 -> dvr-upload.api-v2
172.20.0.8 -> router.api-v2
172.20.0.9 -> kafka.api-v2
172.20.0.10 -> jimi-data.api-v2
172.20.0.11 -> jimi-tracker-upload-process.api-v2
172.20.0.12 -> msg-dispatch-iothub.api-v2
172.20.0.13 -> jimi-tracker-gate-upload.api-v2
172.20.0.14 -> tracker-instruction-server.api-v2
172.20.0.15 -> api-v2-iothub-1.api-v2
172.20.0.16 -> api.api-v2
172.20.0.17 -> tracker-gate-v1.api-v2
172.20.0.18 -> jimi-gateway-450.api-v2
172.20.0.19 -> jimi-gateway-v541h.api-v2
=== reverse DNS 172.20.1-10 ===
=== forward candidates ===
mongodb => 172.20.0.3      mongodb 
redis => 172.20.0.5      redis 
kafka => 172.20.0.9      kafka 
zookeeper => 172.20.0.4      zookeeper 
api => 172.20.0.16     api 
api-listener-jimiiot-push => 172.20.0.2      api-listener-jimiiot-push 
api-v2-iothub => 172.20.0.15     api-v2-iothub 
api-v2-iothub-1 => 172.20.0.15     api-v2-iothub-1 
DONE