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Any ded­i­cated server host­ing some web­sites that get mean­ing­ful traf­fic will quickly our­grow Cpanel's default /tmp folder size of 512MB. It houses PHP ses­sion files, tem­po­rary file uploads, your data­base tem­po­rary files, your web server's cache includ­ing the one from caches such as APC or eAc­cel­er­a­tor, and other such stuff.

With the tmp par­ti­tion full, the server will expe­ri­ence many ran­dom issues such as server crashes. Your sites will quickly go down and leave you head-scratching.

For­tu­nately, it's quite easy to resize the /tmp par­ti­tion on cPanel servers — espe­cially if it is the default one cre­ated by cPanel installs. There's a handy script at /scripts/securetmp.

Open this file:

pico /scripts/securetmp

And find this line:

my $tmpdsksize = 512000; # Must be larger than 250000

Change it to a larger num­ber than 512 MB. Say you want it to be 2 GB:

my $tmpdsksize = 2097152; # 2GB for the /tmp folder

Now close and save the file.

We need to stop all ser­vices that may be using this folder. For me, this includes MySQL, Apache and Nginx.

service mysql stop
service nginx stop
service httpd stop

Now we will sim­ply unmount the /tmp folder and recre­ate it. Here's the sequence of com­mands to cre­ate it:

lsof /tmp
umount -l /tmp
umount -l /var/tmp
rm -fv /usr/tmpDSK
/scripts/securetmp

Done. You can ver­ify the size of the /tmp folder among others:

df -h

This should show you some­thing like this:

...
/usr/tmpDSK ext3 2.0G 996M 1.1G 51% /tmp
...

NOTE: If you have any prob­lems, for instance, the size of the recre­ated /tmp folder is not really 2GB despite that code in the /scripts/securetmp we changed, it may be because of some set­tings you have in the /etc/fstab file. Take a look at it and com­ment out any lines that inter­fere with the LABEL for /tmp mount.

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The recent upgrades of Cpanel have been a pain because they've bro­ken mysql­hot­copy. Not kosher. For­tu­nately fix­ing this is pretty straight­for­ward by sim­ply down­grad­ing the DBD mod­ule of Perl, on which mysql­hot­copy relies.

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