Ubuntu下mysql无法重启

错误日志：

$ tail -n 100 /var/log/mysql/error.log | head -n 20 #或者 tail -n 20 /var/log/mysql/error.log

最近的错误信息：

InnoDB: Unable to lock ./ibdata1, error: 11

InnoDB: Check that you do not already have another mysqld process

InnoDB: using the same InnoDB data or log files.

InnoDB: Unable to lock ./ibdata1, error: 11

InnoDB: Check that you do not already have another mysqld process

InnoDB: using the same InnoDB data or log files.

InnoDB: Unable to lock ./ibdata1, error: 11

InnoDB: Check that you do not already have another mysqld process

InnoDB: using the same InnoDB data or log files.

InnoDB: Unable to lock ./ibdata1, error: 11

InnoDB: Check that you do not already have another mysqld process

InnoDB: using the same InnoDB data or log files.

InnoDB: Unable to lock ./ibdata1, error: 11

InnoDB: Check that you do not already have another mysqld process

InnoDB: using the same InnoDB data or log files.

151009 21:54:03 InnoDB: Unable to open the first data file

InnoDB: Error in opening ./ibdata1

151009 21:54:03 InnoDB: Operating system error number 11 in a file operation.

InnoDB: Error number 11 means 'Resource temporarily unavailable'.

InnoDB: Some operating system error numbers are described at

错误已经很明确了：存在其它的mysql数据库服务进程

$ ps aux | grep mysql

找到mysqld进程ID，kill

mysql 6821 0.0 1.1 484456 47276 ? Ssl 22:15 0:00 /usr/sbin/mysqld

$ sudo kill 6821 #这里的数字是mysqld的进程ID

$ sudo /etc/init.d/mysql start