InnoDB: Check that you do not already have another mysqld process 错误解决办法

非正常关机之后 再次启动mysql 失败

错误信息如下：

150721 15:45:27 mysqld_safe Starting mysqld daemon with databases from /opt/mysql/data

150721 15:45:27 [Note] Flashcache bypass: disabled

150721 15:45:27 [Note] Flashcache setup error is : ioctl failed

150721 15:45:27 [Note] Plugin 'FEDERATED' is disabled.

150721 15:45:27 [Warning] option 'innodb-additional-mem-pool-size': signed value 200 adjusted to 524288

150721 15:45:27 InnoDB: The InnoDB memory heap is disabled

150721 15:45:27 InnoDB: Mutexes and rw_locks use GCC atomic builtins

150721 15:45:27 InnoDB: Compressed tables use zlib 1.2.3

150721 15:45:27 InnoDB: Using Linux native AIO

150721 15:45:27 InnoDB: Initializing buffer pool, size = 1.0G

150721 15:45:28 InnoDB: Completed initialization of buffer pool

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.

150721 15:45:28 InnoDB: Retrying to lock the first data file

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



解决办法：

[root@192-168-102-57 log]# ps -ef|grep mysql

root 11979 1 0 Jul16 ? 00:00:00 /bin/sh /opt/mysql/bin/mysqld_safe --datadir=/opt/mysql/data --pid-file=/opt/mysql/data/192_168_102_47.sky-mobi.com.hz.bj.pid

mysql 12749 11979 0 Jul16 ? 00:03:19 /opt/mysql/bin/mysqld --basedir=/opt/mysql --datadir=/opt/mysql/data --plugin-dir=/opt/mysql/lib/mysql/plugin --user=mysql --log-error=/opt/mysql/log/alert.log --open-files-limit=65535 --pid-file=/opt/mysql/data/192_168_102_47.sky-mobi.com.hz.bj.pid
--socket=/opt/mysql/run/mysql.sock --port=3306

root 29336 29085 0 15:48 pts/1 00:00:00 grep mysql



可以看到有其它进程占用了 mysql的data文件夹

kill 掉这些进程之后 再次启动 mysql 正常启动



总结: 再启动mysql之前 先查看一下是否有其它的进程 占用mysql的数据文件

如果有则杀掉占用的进程 再启动mysql