Mysql service won't start, InnoDB init function error

Question

So seemingly out of nowhere tonight, my wordpress site went down and I've traced it to problems with mysql. Mysql won't start on the server because it keeps failing.

Here is what I'm getting from the logs:

140226 08:54:11 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
140226 08:58:20 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
140226  8:58:20 [Note] Plugin 'FEDERATED' is disabled.
140226  8:58:20 InnoDB: The InnoDB memory heap is disabled
140226  8:58:20 InnoDB: Mutexes and rw_locks use GCC atomic builtins
140226  8:58:20 InnoDB: Compressed tables use zlib 1.2.3
140226  8:58:20 InnoDB: Using Linux native AIO
/usr/libexec/mysqld: Can't create/write to file '/dev/shm/mysql/ibOqUOjF' (Errcode: 2)
140226  8:58:20  InnoDB: Error: unable to create temporary file; errno: 2
140226  8:58:20 [ERROR] Plugin 'InnoDB' init function returned error.
140226  8:58:20 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
140226  8:58:20 [ERROR] Unknown/unsupported storage engine: InnoDB
140226  8:58:20 [ERROR] Aborting

I've tried Googling and looking here on Stack Overflow, but I can't seem to find many solutions except to delete the ipdata1 and log files which, as I've read, shouldn't be done with stored data because it would mess up my tables.

This is on an NGINX CentOS 6 server.

Any ideas? I appreciate the help!

Solution 1

AFAIK System error: 2 = No such file or directory.

Check that the directory exist, that mysql has permission to write to it and that there enough space left on the disk.

Solution 2

Another consideration might be to ensure your tmpdir used for mysql has enough disk space and required permission.

In addition, for windows users: consider using front slash (/) as against back slash (\) for your tmpdir path

Comments

[evan3168]

So the directory definitely exists. I've given 776 permission to mysql:mysql. I rebooted the server and now it won't start at all. Even with the directory and permissions fixed. NGINX error logs don't show anything recent.

[evan3168]

The logs were saying the same thing, but it wasn't starting. I managed to get in touch with my sysadmin who fixed the issue, but hasn't yet briefed me on the cause. I'll make sure to followup here. Thanks for your help!

[1232133d2ffa]

Thank god! I fought with this forever, I use SSD Caching and MUST specify the Windows tmpdir!

[Christian Læirbag]

Double back slash can also be used, since a single one is used as an escape character.