将cd /usr/local/redis/sentinel.conf复制到/usr/local/redis/etc/下
cd /usr/local/redis/
cp sentinel.conf /usr/local/redis/etc/
修改sentinel.conf配置文件
cd etc/
vim sentinel.conf
192.168.1.111 6379 1
启动哨兵模式
cd /usr/local/redis/bin/
./redis-server ../etc/redis.conf
./redis-server /usr/local/redis/etc/sentinel.conf --sentinel &
当主机宕机后，112从机自动变成主机
