Monday, 5 December 2011

Increasing the Size of tmpDSK (/tmp)


By default on most servers, /tmp is the temporary dumping place for a lot of things, for example:

   * PHP session files
   * PHP temporary file uploads
   * MySQL temporary files
   * Cache files for certain Apache modules

When your /tmp partition fills up, it can cause noticeable problems for your users. If you run a larger server, the /tmp folder can fill up quickly and be very annoying as far as maintenance is concerned. Fortunately there is a very easy way to increase the size of this partition on a standalone server.

  1. Stop MySQL, Apache, and cPanel to prevent writing to the /tmp partition
  2. Copy the contents of /tmp to another location, such as /home (cp -rfp /tmp /home)
  3. Unmount /tmp. If you’re unable to, you can do an lsof (lsof |grep /tmp) to see what processes are still writing to it, and kill them off. Or do a lazy unmount (umount -l /tmp) .
  4. Delete /usr/tmpDSK (rm -rf /usr/tmpDSK)

Now open /scripts/securetmp and look for this line:

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

And change the “512000″ value to your desired size in MB, and save the file. Now run the following script to recreate /tmp:

   /scripts/securetmp

This will recreate your /tmp (tmpDSK) partition using the size you specified. While the securetmp script may be overwritten in a cPanel update, the size of /tmp will not be affected one you alter its size.

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