由于之前在运行docker上的redis集群时出现:

之后也就没有在意，后来在项目中遇到

org.springframework.data.redis.ClusterStateFailureException: Could not retrieve cluster information. CLUSTER NODES returned with error.
	at org.springframework.data.redis.connection.jedis.JedisClusterConnection$JedisClusterTopologyProvider.getTopology(JedisClusterConnection.java:4241) ~[spring-data-redis-1.8.20.RELEASE.jar:na]
	at org.springframework.data.redis.connection.ClusterCommandExecutor.getClusterTopology(ClusterCommandExecutor.java:343) ~[spring-data-redis-1.8.20.RELEASE.jar:na]
	at org.springframework.data.redis.connection.ClusterCommandExecutor.executeCommandOnArbitraryNode(ClusterCommandExecutor.java:103) ~[spring-data-redis-1.8.20.RELEASE.jar:na]
	at org.springframework.data.redis.connection.jedis.JedisClusterConnection.clusterGetClusterInfo(JedisClusterConnection.java:3940) ~[spring-data-redis-1.8.20.RELEASE.jar:na]
	at org.springframework.boot.actuate.health.RedisHealthIndicator.doHealthCheck(RedisHealthIndicator.java:56) ~[spring-boot-actuator-1.5.20.RELEASE.jar:1.5.20.RELEASE]
	at org.springframework.boot.actuate.health.AbstractHealthIndicator.health(AbstractHealthIndicator.java:43) ~[spring-boot-actuator-1.5.20.RELEASE.jar:1.5.20.RELEASE]
	at org.springframework.boot.actuate.health.CompositeHealthIndicator.health(CompositeHealthIndicator.java:68) [spring-boot-actuator-1.5.20.RELEASE.jar:1.5.20.RELEASE]
	at org.springframework.boot.actuate.endpoint.HealthEndpoint.invoke(HealthEndpoint.java:86) [spring-boot-actuator-1.5.20.RELEASE.jar:1.5.20.RELEASE]
	at org.springframework.boot.actuate.endpoint.HealthEndpoint.invoke(HealthEndpoint.java:36) [spring-boot-actuator-1.5.20.RELEASE.jar:1.5.20.RELEASE]
	at org.springframework.boot.actuate.endpoint.jmx.DataEndpointMBean.getData(DataEndpointMBean.java:46) [spring-boot-actuator-1.5.20.RELEASE.jar:1.5.20.RELEASE]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_201]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_201]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_201]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_201]
	at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71) [na:1.8.0_201]
	at sun.reflect.GeneratedMethodAccessor78.invoke(Unknown Source) ~[na:na]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_201]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_201]
	at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275) [na:1.8.0_201]
	at javax.management.modelmbean.RequiredModelMBean$4.run(RequiredModelMBean.java:1252) [na:1.8.0_201]
	at java.security.AccessController.doPrivileged(Native Method) [na:1.8.0_201]
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74) [na:1.8.0_201]
	at javax.management.modelmbean.RequiredModelMBean.invokeMethod(RequiredModelMBean.java:1246) [na:1.8.0_201]
	at javax.management.modelmbean.RequiredModelMBean.invoke(RequiredModelMBean.java:1085) [na:1.8.0_201]
	at org.springframework.jmx.export.SpringModelMBean.invoke(SpringModelMBean.java:90) [spring-context-4.3.23.RELEASE.jar:4.3.23.RELEASE]
	at javax.management.modelmbean.RequiredModelMBean.getAttribute(RequiredModelMBean.java:1562) [na:1.8.0_201]
	at org.springframework.jmx.export.SpringModelMBean.getAttribute(SpringModelMBean.java:109) [spring-context-4.3.23.RELEASE.jar:4.3.23.RELEASE]
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:647) [na:1.8.0_201]
	at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:678) [na:1.8.0_201]
	at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1445) [na:1.8.0_201]
	at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76) [na:1.8.0_201]
	at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309) [na:1.8.0_201]
	at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401) [na:1.8.0_201]
	at javax.management.remote.rmi.RMIConnectionImpl.getAttribute(RMIConnectionImpl.java:639) [na:1.8.0_201]
	at sun.reflect.GeneratedMethodAccessor40.invoke(Unknown Source) ~[na:na]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_201]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_201]
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357) [na:1.8.0_201]
	at sun.rmi.transport.Transport$1.run(Transport.java:200) [na:1.8.0_201]
	at sun.rmi.transport.Transport$1.run(Transport.java:197) [na:1.8.0_201]
	at java.security.AccessController.doPrivileged(Native Method) [na:1.8.0_201]
	at sun.rmi.transport.Transport.serviceCall(Transport.java:196) [na:1.8.0_201]
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573) [na:1.8.0_201]
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834) [na:1.8.0_201]
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688) [na:1.8.0_201]
	at java.security.AccessController.doPrivileged(Native Method) [na:1.8.0_201]
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687) [na:1.8.0_201]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[na:1.8.0_201]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[na:1.8.0_201]
	at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_201]

通过本地命令也是出现连接连接超时:

 

忽然想到是不是因为虚拟机端口转发未开， 外部无法访问，下面附上解决方案

(1)进入centos7，输入命令

vi /etc/sysctl.conf

（2）在下面添加:

net.ipv4.ip_forward=1

然后保存

（3）重启network

systemctl restart network

（4）查看

sysctl net.ipv4.ip_forward

 

 

 

(5)连接