centos7系统默认的yum源自带的mysql数据库版本为mariadb5.5.68，因业务需要使用mysql5.7版本，可通过以下步骤使用rpm二进制包方式安装：
移除系统自带 Mariadb组件，避免版本组件冲突
rpm -qa |grep mariadb
yum remove mariadb-libs-5.5.68-1.el7.x86_64
在清华大学镜像源下载rpm包
wget https://mirrors.tuna.tsinghua.edu.cn/mysql/yum/mysql-5.7-community-el7-x86_64/mysql-community-common-5.7.36-1.el7.x86_64.rpm
wget https://mirrors.tuna.tsinghua.edu.cn/mysql/yum/mysql-5.7-community-el7-x86_64/mysql-community-server-5.7.36-1.el7.x86_64.rpm
wget https://mirrors.tuna.tsinghua.edu.cn/mysql/yum/mysql-5.7-community-el7-x86_64/mysql-community-client-5.7.36-1.el7.x86_64.rpm
wget https://mirrors.tuna.tsinghua.edu.cn/mysql/yum/mysql-5.7-community-el7-x86_64/mysql-community-libs-5.7.36-1.el7.x86_64.rpm
wget https://mirrors.tuna.tsinghua.edu.cn/mysql/yum/mysql-5.7-community-el7-x86_64/mysql-community-libs-compat-5.7.36-1.el7.x86_64.rpm
依次yum安装，注意先后顺序
yum install mysql-community-common-5.7.36-1.el7.x86_64.rpm
yum install mysql-community-libs-5.7.36-1.el7.x86_64.rpm
yum install mysql-community-client-5.7.36-1.el7.x86_64.rpm
yum install mysql-community-server-5.7.36-1.el7.x86_64.rpm
yum install mysql-community-libs-compat-5.7.36-1.el7.x86_64.rpm
启动mysql服务
systemctl start mysqld.service
systemctl enable mysqld.service
mysql5.7第一次登陆要求修改root密码
查看初始密码
grep "password" /var/log/mysqld.log
修改root初始密码
alter user 'root'@'localhost' identified with mysql_native_password by 'password';