flink Caused by: java.net.BindException: Could not start rest endpoint on any port in port range 808

flink 启动，standalone 模式 StandaloneSessionClusterEntrypoint 进程起不来

查看log日志文件

org.apache.flink.runtime.entrypoint.ClusterEntrypointException: Failed to initialize the cluster entrypoint StandaloneSessionClusterEn
	at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.startCluster(ClusterEntrypoint.java:190) ~[flink-dist_2.11-1.11.2.jar
	at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.runClusterEntrypoint(ClusterEntrypoint.java:520) [flink-dist_2.11-1.1
	at org.apache.flink.runtime.entrypoint.StandaloneSessionClusterEntrypoint.main(StandaloneSessionClusterEntrypoint.java:64) [fl
Caused by: org.apache.flink.util.FlinkException: Could not create the DispatcherResourceManagerComponent.
	at org.apache.flink.runtime.entrypoint.component.DefaultDispatcherResourceManagerComponentFactory.create(DefaultDispatcherReso
	at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.runCluster(ClusterEntrypoint.java:219) ~[flink-dist_2.11-1.11.2.jar:1
	at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.lambda$startCluster$0(ClusterEntrypoint.java:172) ~[flink-dist_2.11-1
	at org.apache.flink.runtime.security.contexts.NoOpSecurityContext.runSecured(NoOpSecurityContext.java:30) ~[flink-dist_2.11-1.
	at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.startCluster(ClusterEntrypoint.java:171) ~[flink-dist_2.11-1.11.2.jar
	... 2 more
Caused by: java.net.BindException: Could not start rest endpoint on any port in port range 8081
	at org.apache.flink.runtime.rest.RestServerEndpoint.start(RestServerEndpoint.java:222) ~[flink-dist_2.11-1.11.2.jar:1.11.2]
	at org.apache.flink.runtime.entrypoint.component.DefaultDispatcherResourceManagerComponentFactory.create(DefaultDispatcherReso
	at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.runCluster(ClusterEntrypoint.java:219) ~[flink-dist_2.11-1.11.2.jar:1
	at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.lambda$startCluster$0(ClusterEntrypoint.java:172) ~[flink-dist_2.11-1
	at org.apache.flink.runtime.security.contexts.NoOpSecurityContext.runSecured(NoOpSecurityContext.java:30) ~[flink-dist_2.11-1.
	at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.startCluster(ClusterEntrypoint.java:171) ~[flink-dist_2.11-1.11.2.jar
	... 2 more

看错误信息，发现是端口被占用问题，修改配置文件 flink-conf.yaml 中的默认端口：

#==============================================================================
# Rest & web frontend
#==============================================================================

# The port to which the REST client connects to. If rest.bind-port has
# not been specified, then the server will bind to this port as well.
#
#rest.port: 8081
rest.port: 8085

重启，解决问题!