连接redis时遇到Caused by: io.netty.channel.ConnectTimeoutException: connection timed out: /问题

连接不到redis错误：

Caused by: io.netty.channel.ConnectTimeoutException: connection timed out: /192.168.211.133:6379

• 这个问题有很大的可能是Linux的防火墙未关闭，请求无法到达redis客户端。

• 我使用的Centos7 ，查看防火墙和6的命令应该是不同的，之前在这个地方都跌倒过了

2020-08-21 17:43:42.091  INFO 25692 --- [nio-8004-exec-4] io.lettuce.core.KqueueProvider           : Starting without optional kqueue library
org.springframework.data.redis.connection.PoolException: Could not get a resource from the pool; nested exception is io.lettuce.core.RedisConnectionException: Unable to connect to 192.168.211.133:6379
    at org.springframework.data.redis.connection.lettuce.LettucePoolingConnectionProvider.getConnection(LettucePoolingConnectionProvider.java:109)
    at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.getNativeConnection(LettuceConnectionFactory.java:1198)
    at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.getConnection(LettuceConnectionFactory.java:1179)
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    at java.lang.Thread.run(Thread.java:748)
Caused by: io.lettuce.core.RedisConnectionException: Unable to connect to 192.168.211.133:6379
    at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:78)
    at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:56)
    at io.lettuce.core.AbstractRedisClient.getConnection(AbstractRedisClient.java:234)
    at io.lettuce.core.RedisClient.connect(RedisClient.java:207)
    at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.lambda$getConnection$1(StandaloneConnectionProvider.java:115)
    at java.util.Optional.orElseGet(Optional.java:267)
    at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.getConnection(StandaloneConnectionProvider.java:115)
    at org.springframework.data.redis.connection.lettuce.LettucePoolingConnectionProvider.lambda$null$0(LettucePoolingConnectionProvider.java:97)
    at io.lettuce.core.support.ConnectionPoolSupport$RedisPooledObjectFactory.create(ConnectionPoolSupport.java:209)
    at io.lettuce.core.support.ConnectionPoolSupport$RedisPooledObjectFactory.create(ConnectionPoolSupport.java:199)
    at org.apache.commons.pool2.BasePooledObjectFactory.makeObject(BasePooledObjectFactory.java:58)
    at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:889)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:424)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:349)
    at io.lettuce.core.support.ConnectionPoolSupport$1.borrowObject(ConnectionPoolSupport.java:122)
    at io.lettuce.core.support.ConnectionPoolSupport$1.borrowObject(ConnectionPoolSupport.java:117)
    at org.springframework.data.redis.connection.lettuce.LettucePoolingConnectionProvider.getConnection(LettucePoolingConnectionProvider.java:103)
    ... 69 more
Caused by: io.netty.channel.ConnectTimeoutException: connection timed out: /192.168.211.133:6379
    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe$1.run(AbstractNioChannel.java:261)
    at io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98)
    at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:150)
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:510)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:518)
    at io.netty.util.concurrent.SingleThreadEventExecutor$6.run(SingleThreadEventExecutor.java:1050)
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    ... 1 more

• 外部访问redis的前提是把redis配置文件中的 protected-mode yes,改为 protected-mode no 这样redis才允许外部访问

• 查看Linux防火墙状态命令：systemctl status firewalld.service

systemctl status firewalld.service

• running 是防火墙正在运行

 原来是防火墙没有关闭

• 关闭防火强命令：systemctl stop firewalld.service
• 出现 dead 说明防火强关闭

systemctl stop firewalld.service

成功了

在redis中可以查看到缓存数据【不知道为什么开始没查到，又刷了几次页面查到了】