下载安装文件

到mysql官网找到5.7的下载地址：https://downloads.mysql.com/archives/get/p/23/file/mysql-5.7.33-linux-glibc2.12-x86_64.tar.gz

    //下载mysql压缩包
    cd /usr/local/
    wget https://downloads.mysql.com/archives/get/p/23/file/mysql-5.7.33-linux-glibc2.12-x86_64.tar.gz

   //解压缩
   tar -xvzf mysql-5.7.33-linux-glibc2.12-x86_64.tar.gz

处理旧版mysql

//关闭mysql服务
service mysqld stop

//备份mysql5.6
mv /usr/local/mysql /usr/local/mysql5.6

安装mysql5.7

//修改目录名
mv /usr/local/mysql-5.7.33-linux-glibc2.12-x86_64 /usr/local/mysql

//创建data目录，mysql5.7.33默认没有这个文件
mkdir /usr/local/mysql/data

//安装mysql5.7
/usr/local/mysql/bin/mysqld --initalize --user=mysql --datadir=/usr/local/mysql/data --basedir=/usr/local/mysql

安装完mysql，注意看最后一行root密码

//启动mysql
service mysqld start

修改密码

//登录mysql
mysql -uroot -ppwd

//修改密码
alter user 'root'@'localhost' identified by 'new passwd';
flush privileges;

自此mysql升级完成。

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