在 Ubuntu 16/18 上重置 MySQL 5.7 root 账户密码

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apt install mysql-server, 莫名其妙的就装完了，都没有让我设置密码，现在只能通过其他方式来重置密码。

# Stop MySQL
sudo service mysql stop
# Make MySQL service directory.
sudo mkdir /var/run/mysqld
# Give MySQL user permission to write to the service directory.
sudo chown mysql: /var/run/mysqld
# Start MySQL manually, without permission checks or networking.
sudo mysqld_safe --skip-grant-tables --skip-networking &
# Log in without a password.
mysql -uroot mysql

然后就可以通过 SQL 修改 root 密码了

UPDATE mysql.user SET authentication_string=PASSWORD('root'), plugin='mysql_native_password' WHERE User='root' AND Host='%';

UPDATE mysql.user SET authentication_string=PASSWORD('root'), plugin='mysql_native_password' WHERE User='root' AND Host='localhost';

EXIT;
# Turn off MySQL.
sudo mysqladmin -S /var/run/mysqld/mysqld.sock shutdown
# Start the MySQL service normally.
sudo service mysql start