Jedis 连不接云虚拟机的Redis可能的各种情况

报错如下所示

redis.clients.jedis.exceptions.JedisConnectionException: Failed connecting to ***.***.***.***:6379
    at redis.clients.jedis.Connection.connect(Connection.java:165)
    at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:109)
    at redis.clients.jedis.Connection.sendCommand(Connection.java:114)
    at redis.clients.jedis.BinaryClient.set(BinaryClient.java:133)
    at redis.clients.jedis.Client.set(Client.java:58)
    at redis.clients.jedis.Jedis.set(Jedis.java:153)
    at redis.clients.jedis.ShardedJedis.set(ShardedJedis.java:41)
    at com.lh.JedisPoolDemo.main(JedisPoolDemo.java:40)
Caused by: java.net.SocketTimeoutException: connect timed out

1.查看云虚拟机是否对外开放了Redis的端口

步骤如下：

1.1 首先进入云管理控制台的本实例安全组

　　

1.2 添加能对外访问的Redis端口

2. 修改Redis 配置文件redis.conf

2.1 修改bind 

# By default, if no "bind" configuration directive is specified, Redis listens
# for connections from all the network interfaces available on the server.
# It is possible to listen to just one or multiple selected interfaces using
# the "bind" configuration directive, followed by one or more IP addresses.
#
# Examples:
#
# bind 192.168.1.100 10.0.0.1
# bind 127.0.0.1 ::1

bind 127.0.0.1
# ~~~ WARNING ~~~ If the computer running Redis is directly exposed to the
# internet, binding to all the interfaces is dangerous and will expose the
# instance to everybody on the internet. So by default we uncomment the
# following bind directive, that will force Redis to listen only into
# the IPv4 loopback interface address (this means Redis will be able to
# accept connections only from clients running into the same computer it
# is running).
#
# IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES
# JUST COMMENT THE FOLLOWING LINE.

上面大概的意思就是你可以使用bind 绑定一个或者多个ip地址。如果你不绑定ip,默认所有的ip都可以监听到，但这样操作很危险，因此你需要设置一个登录密码。

如果你只绑定127.0.0.1表示只能监听本地ip访问Redis.既只能通过redis-cli访问redis.

所以要想外部访问有如下两种方式：

2.1.1. 第一种：注释bind,无绑定，添加密码

找到requirepass ,写入密码 ******

关闭 Redis 服务， 重新使用配置文件启动 Redis服务.

绑定了密码的话进入redis 需要输入验证指令   auth  ******* :

2.1.2. 二：输入 ifconfig 命令，找到对外提供的ip和本地ip

 绑定两个ip到 redis.conf 配置文件

关闭 Redis 服务， 重新使用配置文件启动 Redis服务.

3.jedis demo 访问 Redis demo 。

//host 为云虚拟机对外的ip ,也就是xshell 登录的ip.   
Jedis jedis = new Jedis("47.98.151.13",6379); 

   jedis.auth("123456");

  System.out.println(jedis.ping());

输出 pong 完美。。。

如果还不报错的话查看是否关闭了防火墙。关防火墙可以查看如下链接文章

https://www.jb51.net/article/182633.htm