Could not start rest endpoint on any port in port range 8081报错，但是8081未占用啊

Tue, 09 Nov 2021 01:14:54 -0800 

大佬好！
flink ./start-cluster.sh 启动过程中如下错误，但是该端口号未占用啊，请大佬帮看看。谢谢


org.apache.flink.runtime.entrypoint.ClusterEntrypointException: Failed to 
initialize the cluster entrypoint StandaloneSessionClusterEntrypoint.
        at 
org.apache.flink.runtime.entrypoint.ClusterEntrypoint.startCluster(ClusterEntrypoint.java:212)
 ~[flink-dist_2.11-1.13.3.jar:1.13.3]
        at 
org.apache.flink.runtime.entrypoint.ClusterEntrypoint.runClusterEntrypoint(ClusterEntrypoint.java:600)
 [flink-dist_2.11-1.13.3.jar:1.13.3]
        at 
org.apache.flink.runtime.entrypoint.StandaloneSessionClusterEntrypoint.main(StandaloneSessionClusterEntrypoint.java:59)
 [flink-dist_2.11-1.13.3.jar:1.13.3]
Caused by: org.apache.flink.util.FlinkException: Could not create the 
DispatcherResourceManagerComponent.
        at 
org.apache.flink.runtime.entrypoint.component.DefaultDispatcherResourceManagerComponentFactory.create(DefaultDispatcherResourceManagerComponentFactory.java:275)
 ~[flink-dist_2.11-1.13.3.jar:1.13.3]
        at 
org.apache.flink.runtime.entrypoint.ClusterEntrypoint.runCluster(ClusterEntrypoint.java:250)
 ~[flink-dist_2.11-1.13.3.jar:1.13.3]
        at 
org.apache.flink.runtime.entrypoint.ClusterEntrypoint.lambda$startCluster$1(ClusterEntrypoint.java:189)
 ~[flink-dist_2.11-1.13.3.jar:1.13.3]
        at java.security.AccessController.doPrivileged(Native Method) 
~[?:1.8.0_171]
        at javax.security.auth.Subject.doAs(Subject.java:422) ~[?:1.8.0_171]
        at 
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1754)
 ~[flink-shaded-hadoop-2-uber-2.7.5-9.0.jar:2.7.5-9.0]
        at 
org.apache.flink.runtime.security.contexts.HadoopSecurityContext.runSecured(HadoopSecurityContext.java:41)
 ~[flink-dist_2.11-1.13.3.jar:1.13.3]
        at 
org.apache.flink.runtime.entrypoint.ClusterEntrypoint.startCluster(ClusterEntrypoint.java:186)
 ~[flink-dist_2.11-1.13.3.jar:1.13.3]
        ... 2 more
Caused by: java.net.BindException: Could not start rest endpoint on any port in 
port range 8081
        at 
org.apache.flink.runtime.rest.RestServerEndpoint.start(RestServerEndpoint.java:234)
 ~[flink-dist_2.11-1.13.3.jar:1.13.3]
        at 
org.apache.flink.runtime.entrypoint.component.DefaultDispatcherResourceManagerComponentFactory.create(DefaultDispatcherResourceManagerComponentFactory.java:172)
 ~[flink-dist_2.11-1.13.3.jar:1.13.3]
        at 
org.apache.flink.runtime.entrypoint.ClusterEntrypoint.runCluster(ClusterEntrypoint.java:250)
 ~[flink-dist_2.11-1.13.3.jar:1.13.3]
        at 
org.apache.flink.runtime.entrypoint.ClusterEntrypoint.lambda$startCluster$1(ClusterEntrypoint.java:189)
 ~[flink-dist_2.11-1.13.3.jar:1.13.3]
        at java.security.AccessController.doPrivileged(Native Method) 
~[?:1.8.0_171]
        at javax.security.auth.Subject.doAs(Subject.java:422) ~[?:1.8.0_171]
        at 
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1754)
 ~[flink-shaded-hadoop-2-uber-2.7.5-9.0.jar:2.7.5-9.0]
        at 
org.apache.flink.runtime.security.contexts.HadoopSecurityContext.runSecured(HadoopSecurityContext.java:41)
 ~[flink-dist_2.11-1.13.3.jar:1.13.3]
        at 
org.apache.flink.runtime.entrypoint.ClusterEntrypoint.startCluster(ClusterEntrypoint.java:186)
 ~[flink-dist_2.11-1.13.3.jar:1.13.3]
        ... 2 more

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