VMWare虚拟机Centos7安装redis，并通过外部链接

https://www.cnblogs.com/godwhisper/p/6890291.html

默认redis没有密码，自行设置密码

https://www.cnblogs.com/springlight/p/6288902.html

设置密码后要通过密码连接

https://blog.csdn.net/leisure_life/article/details/78460733

redis如何切换db

https://www.cnblogs.com/oxspirt/p/6529791.html