linux 安装 mysql

1. 进入linux某个文件夹下， 然后去https://dev.mysql.com/downloads/mysql/5.7.html 用 wget 下载 mysql的rpm包
   1. mysql-community-client-5.7.33-1.el7.x86_64.rpm
   2. mysql-community-common-5.7.33-1.el7.x86_64.rpm
   3. mysql-community-libs-5.7.33-1.el7.x86_64.rpm
   4. mysql-community-server-5.7.33-1.el7.x86_64.rpm
2. 然后用yum -y install mysql* 安装myql
3. 启动mysql service mysqld start
4. 查看mysql初始密码 grep "password" /var/log/mysqld.log
5. 连接上以后需要重新设置密码： set password for root@localhost = password('Root@123456');