linux启动后，防火墙也开了端口了，但用java连接报错，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:703) ~[lettuce-core-5.0.5.RELEASE.jar:na] at io.lettuce.core.protocol.CommandHandler.channelInactive(CommandHandler.java:309) ~[lettuce-core-5.0.5.RELEASE.jar:na]
很明显：DENIED Redis is running in protected mode because protected mode is enabled
是说处于保护模式，只能本地链接，我们需要修改配置文件../redis.conf ，解决方法如下：
1)打开配置文件把下面对应的注释掉
# bind 127.0.0.1
2)Redis默认不是以守护进程的方式运行，可以通过该配置项修改，使用yes启用守护进程，修改配置文件设置为no
daemonize no
3)修改配置文件保护模式为no
protected-mode no
4)最后关键的是：
没反应应该是你启动服务端的时候没有带上配置文件。
./redis-server ../../redis.conf
