用jedis连接linux系统的redis时出现连接超时的错误

出现的错误：

redis.clients.jedis.exceptions.JedisConnectionException: java.net.SocketTimeoutException: connect timed out

at redis.clients.jedis.Connection.connect(Connection.java:154)

at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:83)

at redis.clients.jedis.Connection.sendCommand(Connection.java:93)

at redis.clients.jedis.Connection.sendCommand(Connection.java:88)

at redis.clients.jedis.BinaryClient.auth(BinaryClient.java:539)

at redis.clients.jedis.BinaryJedis.auth(BinaryJedis.java:2000)

at cn.itheima.redis.jedisTest.setup(jedisTest.java:14)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)

at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:69)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:48)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)

at org.junit.runners.ParentRunner.run(ParentRunner.java:292)

at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)

at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

Caused by: java.net.SocketTimeoutException: connect timed out

at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)

at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)

at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)

at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)

at java.net.AbstractPlainSocketImpl.connect(Unknown Source)

at java.net.PlainSocketImpl.connect(Unknown Source)

at java.net.SocksSocketImpl.connect(Unknown Source)

at java.net.Socket.connect(Unknown Source)

at redis.clients.jedis.Connection.connect(Connection.java:148)

... 29 more

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问题：

请求连接超时。

原因分析：

这是因为安装了redis的linux系统的redis服务端的6379端口被关了。

处理：

需要把6379防火墙的端口打开。

---

开放端口的命令

（以centos7为例【注意不同版本的操作系统命令可能会有所不同】）

开启防火墙 
systemctl start firewalld
开放指定端口

firewall-cmd --zone=public --add-port=6375/tcp --permanent
 （命令含义
--zone #作用域
--add-port=6375/tcp  #添加端口，格式为：端口/通讯协议
--permanent  #永久生效，没有此参数重启后失效）
  重启防火墙
      firewall-cmd --reload