使用Jedis 连接 Redis 时可能出现的常见错误

60 阅读 0 评论 40 点赞

我是靠谱客的博主忧心长颈鹿，最近开发中收集的这篇文章主要介绍使用Jedis 连接 Redis 时可能出现的常见错误，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

本人作为一个初学者学习Redis的使用，遇到了下面一些异常，总结了一些解决方案。

1、SocketTimeoutException 连接超时

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

这种情况先排除是否开启了redis，或者ip地址和端口是否书写正确。如果没有以上问题，那必定是防火墙未允许Redis的默认端口 6379。

编辑防火墙配置文件：vim /etc/sysconfig/iptables

添加红框标注语句，保存并退出。重启防火墙：service iptables restart

2、Connection refused 拒绝访问

Exception in thread "main" redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused: connect

修改redis.conf配置文件，使用vim命令打开。

找到bind那行用#号注释，保存并退出，重启redis-server。

3、JedisDataException：DENIED Redis is running in protected mode 保护模式

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: 1) 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. 2) 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. 3) If you started the server manually just for testing, restart it with the '--protected-mode no' option. 4) 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.

这个异常主要是说redis开启了protected mode，这也是Redis3.2加入的新特性，开启保护模式的redis只允许本机登录，同样在配置文件redis.conf中，如下图