1. yum install epel-release -y
    2. yum install -y jemalloc
    3. wget http://www.rpmfind.net/linux/remi/enterprise/7/remi/x86_64/redis-5.0.9-1.el7.remi.x86_64.rpm
    4. rpm -ivh redis-5.0.9-1.el7.remi.x86_64.rpm
    5. systemctl enable redis
    6. systemctl start redis

    查询redis版本：http://www.rpmfind.net/