1、pstree -p 看看mysql的进程树然后kill -9 pid
设置忽略密码启动mysql服务器mysqld_safe --skip-grant-tables &
输出：[1] 5988Starting mysqld daemon with databases from /var/lib/mysqlmysqld_safe[6025]: started
2、使用mysql客户端连接mysql服务器mysql -u root
输出：Welcome to the MySQL monitor. Commands end with ; or g.Your MySQL connection id is 1 to server version: 4.1.15-Debian_1-log
Type ‘help;’ or ‘h’ for help. Type ‘c’ to clear the buffer.
mysql>
3、设置一个新的mysql root用户密码mysql> use mysql; mysql> update user set password=PASSWORD("NEW-ROOT-PASSWORD") where User='root'; mysql> flush privileges; mysql> quit
停止mysql服务器/etc/init.d/mysql stop
启动mysql服务器并测试/etc/init.d/mysql start mysql -u root -p