Ubuntu18.04 修改Mysql5.7默认root密码

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[mysqld]
skip-grant-tables=1

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$ sudo service mysql stop
$ sudo service mysql strat

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$ mysql
//修改验证方式
mysql> USE mysql;
mysql> UPDATE user SET plugin='mysql_native_password' WHERE User='root';
//修改密码
mysql> update mysql.user set authentication_string=password('123qwe') where user='root' and Host = 'localhost';
//刷新权限
mysql> flush privileges;
//推出
musql> exit;

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$ mysql -uroot -p