1. 停止MySQL服务

sudo /usr/local/mysql/support-files/mysql.server stop

2. 禁止mysql验证功能(先获取管理员权限)

cd /usr/local/mysql/bin/
sudo su
./mysqld_safe --skip-grant-tables &

上述步骤后mysql会自动重启

3. 进入mysql重设密码

./mysql
FLUSH PRIVILEGES;
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '1234';