工程启动不了：
2017-11-01 09:53:46,704 [RMI TCP Connection(5)-127.0.0.1][IP:|USER:][DEBUG
org.apache.kafka.clients.consumer.KafkaConsumer] Starting the Kafka consumer - trace-id=
2017-11-01 09:53:46,741 [RMI TCP Connection(5)-127.0.0.1][IP:|USER:][WARN
org.apache.kafka.clients.ClientUtils] Removing server from bootstrap.servers as DNS resolution failed: test1.kafka.inner.sunlands:9092 - trace-id=
2017-11-01 09:53:46,757 [RMI TCP Connection(5)-127.0.0.1][IP:|USER:][WARN
org.apache.kafka.clients.ClientUtils] Removing server from bootstrap.servers as DNS resolution failed: test2.kafka.inner.sunlands:9092 - trace-id=
2017-11-01 09:53:46,791 [RMI TCP Connection(5)-127.0.0.1][IP:|USER:][WARN
org.apache.kafka.clients.ClientUtils] Removing server from bootstrap.servers as DNS resolution failed: test3.kafka.inner.sunlands:9092 - trace-id=
2017-11-01 09:53:46,795 [RMI TCP Connection(5)-127.0.0.1][IP:|USER:][DEBUG
org.apache.kafka.clients.consumer.KafkaConsumer] The Kafka consumer has closed. - trace-id=
2017-11-01 09:53:46,797 [RMI TCP Connection(5)-127.0.0.1][IP:|USER:][INFO
https://segmentfault.com/q/1010000006618887/a-1020000006943911
修改hosts文件：
hosts文件配置：
172.16.116.136 test1.kafka.inner.sunlands
172.16.100.203 test2.kafka.inner.sunlands
172.16.117.226 test3.kafka.inner.sunlands
win7运行命令快捷键即是win+R。（有可能与浏览器的冲突，慎用）
点击编辑，勾选修改权限即可。