Having failed to fix the ugly partition system, we’re going for reconfiguring mysql to make it elsewhere. I followed this post to try to get the temporary directory to point to another partition: https://encylia.com/2015/02/06/how-to-change-the-mysql-tmp-location-on-centos/ by doing all of the following under sudo:

mkdir /home/mysqltmp
chmod 1777 /home/mysqltmp

nano /etc/my.cnf

Add below line under the [mysqld] section and save the file:
tmpdir=/home/mysqltmp

systemctl restart mysqld

This restart fails. If I restore the old my.cnf without the change, it works perfectly. Checking the log, it seems there’s a permissions issue:

2018-05-16T00:01:05.211853Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.22) starting as process 5929 ...
2018-05-16T00:01:05.214159Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-05-16T00:01:05.214186Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-05-16T00:01:05.214191Z 0 [Note] InnoDB: Uses event mutexes
2018-05-16T00:01:05.214194Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-05-16T00:01:05.214197Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.3
2018-05-16T00:01:05.214202Z 0 [Note] InnoDB: Using Linux native AIO
2018-05-16T00:01:05.214382Z 0 [Note] InnoDB: Number of pools: 1
2018-05-16T00:01:05.214459Z 0 [Note] InnoDB: Using CPU crc32 instructions
mysqld: Can't create/write to file '/home/mysqltmp/ibAcknwl' (Errcode: 13 - Permission denied)
2018-05-16T00:01:05.214535Z 0 [ERROR] InnoDB: Unable to create temporary file; errno: 13
2018-05-16T00:01:05.214542Z 0 [ERROR] InnoDB: Plugin initialization aborted with error Generic error
2018-05-16T00:01:05.214548Z 0 [ERROR] Plugin 'InnoDB' init function returned error.
2018-05-16T00:01:05.214551Z 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
2018-05-16T00:01:05.214554Z 0 [ERROR] Failed to initialize builtin plugins.
2018-05-16T00:01:05.214557Z 0 [ERROR] Aborting

Any clues as to what I’ve done wrong?

Thanks,
Eric

> On May 15, 2018, at 12:07 AM, Steven Haigh <[log in to unmask]> wrote:
> 
> Your ibtmp1 file will be written to /var/lib/mysql/ by default. That's on a partition that is full.
> 
> Either reconfigure mysql to create this elsewhere, or fix the ugly partition system :)
> 
> -- 
> Steven Haigh
> 
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