springboot连接redis数据库，报错如下:
io.lettuce.core.RedisConnectionException: 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.
at io.lettuce.core.protocol.CommandHandler.onProtectedMode(CommandHandler.java:706) ~[lettuce-core-5.0.3.RELEASE.jar:na]
at io.lettuce.core.protocol.CommandHandler.channelInactive(CommandHandler.java:309) ~[lettuce-core-5.0.3.RELEASE.jar:na]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:245) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:231) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:224) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:75) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.lettuce.core.ChannelGroupListener.channelInactive(ChannelGroupListener.java:46) ~[lettuce-core-5.0.3.RELEASE.jar:na]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:245) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:231) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:224) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:75) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.lettuce.core.PlainChannelInitializer$1.channelInactive(PlainChannelInitializer.java:85) ~[lettuce-core-5.0.3.RELEASE.jar:na]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:245) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:231) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:224) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelInactive(DefaultChannelPipeline.java:1429) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:245) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:231) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:947) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.channel.AbstractChannel$AbstractUnsafe$8.run(AbstractChannel.java:822) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) ~[netty-common-4.1.23.Final.jar:4.1.23.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404) ~[netty-common-4.1.23.Final.jar:4.1.23.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:463) ~[netty-transport-4.1.23.Final.jar:4.1.23.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:886) ~[netty-common-4.1.23.Final.jar:4.1.23.Final]
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.23.Final.jar:4.1.23.Final]
at java.lang.Thread.run(Unknown Source) [na:1.8.0_151]
原因:Redis protected-mode 是3.2 之后加入的新特性，处于保护模式
解决办法:设置redis连接密码
进入客户端
[root@localhost redis]# ./bin/redis-cli
设置密码: 123456
127.0.0.1:6379>config set requirepass 123456
退出:
127.0.0.1:6379> quit
再次进入客户端:
[root@localhost redis]#./bin/redis-cli
输入密码:
127.0.0.1:6379> auth 123456
OK
说明设置成功