问题：redis-cli的server closed the connection（服务器关闭连接）

1.开启firewalld防火墙

systemctl start firewalld

2.开启6379端口

 firewall-cmd --add-port=6379/tcp --permanent

1.关闭firewalld防火墙

systemctl stop firewalld

3.重启redis

 ./redis-server  /usr/local/redis/etc/redis.conf

4.登录redis-cli

[root@233 bin]# redis-cli
127.0.0.1:6379> get k
(error) NOAUTH Authentication required.
127.0.0.1:6379>auth （密码）