java jedis connect timed out_Java连接Redis connection timed out 报错的解决方法

Java连接Redis connection timed out 报错的解决方法

踩坑场景

在使用 RedisTemplate 连接 Redis 进行操作的时候，发生了如下报错：

报错信息如下：

Caused by: io.netty.channel.ConnectTimeoutException: connection timed out: /192.168.73.10:6379

at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe$1.run(AbstractNioChannel.java:267)

at io.netty.util.concurrent.PromiseTask$RunnableAdapter.call(PromiseTask.java:38)

at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:127)

at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)

at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)

at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:495)

at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:905)

at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)

at java.lang.Thread.run(Thread.java:748)

8cc65b14a781

image-20201028114433063

当时使用 Redis 的代码为：

@RunWith(SpringRunner.class)

@SpringBootTest(classes = RedisStudy01Application.class)

public class RedisStudy01ApplicationTests {

@Autowired

RedisTemplate redisTemplate;

@Test

public void contextLoads() {

redisTemplate.opsForValue().set("name","xp");

String name = redisTemplate.opsForValue().get("name");

System.out.println(name);

}

环境

报错时的环境为：

SpringBoot 2.1.4

Redis 6.0.8

CentOS 7

Windows 10

idea 2019.1

解决过程

看到这个报错的时候，我先想到的就是本机和 Redis 是否能 ping 得通。经过测试，能 ping 通

ping ip

然后我就觉得可能是 Linux 防火墙在干坏事，所以关闭了 Linux 防火墙

查看防火墙

systemctl status firewalld

service iptables status

暂时关闭防火墙

systemctl stop firewalld

service iptables stop

永久关闭防火墙

systemctl disable firewalld

chkconfig iptables off

但是关闭防火墙后，还是不能连接到远程Linux系统中的Redis，反而出现了一个新的报错

报错信息如下：

Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: no further information: /192.168.73.10:6379

或者是

Exception in thread "main" redis.clients.jedis.exceptions.JedisDataException: DENIED Redis is running in protected mode because protected mode is enabled, no bind address was specified, no authentication password is requested to clients. In this mode connections are only accepted from the loopback interface. If you want to connect from external computers to Redis you may adopt one of the following solutions:

Just disable protected mode sending the command 'CONFIG SET protected-mode no' from the loopback interface by connecting to Redis from the same host the server is running, however MAKE SURE Redis is not publicly accessible from internet if you do so. Use CONFIG REWRITE to make this change permanent.

Alternatively you can just disable the protected mode by editing the Redis configuration file, and setting the protected mode option to 'no', and then restarting the server

If you started the server manually just for testing, restart it with the '--protected-mode no' option.

Setup a bind address or an authentication password. NOTE: You only need to do one of the above things in order for the server to start accepting connections from the outside

总结这篇博客就是：

修改 redis 配置文件

将 bind 注释掉，允许非本机访问

关闭安全守护模式，将 protected-mode 设置为 no

加上安全认证，设置 requirepass 密码，但在我的测试中，不设置密码只执行上面两个步骤，也可以解决这个 bug

执行上面操作后，重启 Redis 服务端，报错就解决了

解决步骤

1. 测试主机和Linux服务器是否能连通

互相 ping 主机和 Linux 服务器的 ip，查看是否能 ping 通连接

ping 不通的话得解决网络问题，或者关闭 Linux 防火墙试试

如果是虚拟机的话，在虚拟机的设置中切换网络连接模式

虚拟机 --> 设置 --> 网络适配器 --> 修改网络连接模式