https://baijiahao.baidu.com/s?id=1621918338213717988
将Centos的yum源更换为国内的阿里云源
备份你的原镜像文件，保证出错后可以恢复：
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
下载新的CentOS-Base.repo 到/etc/yum.repos.d/
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
安装redis
yum install redis
防止出现# [MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist]（强制关闭Redis快照导致不能持久化）的错误
vi /etc/redis.conf
找到stop-writes-on-bgsave-error，修改为no
启动redis
systemctl start redis.service
设置redis开机启动
systemctl enable redis.service
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