In order to increase the size of /tmp partition. Go through the following steps :
1. First stop MySQL, Apache, and cPanel to prevent writing to the /tmp partition :
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/etc/init.d/mysql stop
/etc/init.d/httpd stop
/etc/init.d/cpanel stop
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2. Take a backup of the current /tmp folder.
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tar -czfv tmp.tar.gz tmp
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3. Umount /tmp partition. If you’re unable to, you can do an lsof to see what processes are still writing to it, and kill them off.
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umount tmp
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4. Delete /usr/tmpDSK
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rm -rf /usr/tmpDSK
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5. Now edit the file /scripts/securetmp. Search for “tmpdsksize” and set the size you want in MB.
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vi /scripts/securetmp
$tmpdsksize = 512000 (change the “512000? value to your desired size in MB)
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Save and quit the file.
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.
6. Now you can untar the /tmp backup
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tar -xzvf tmp.tar.gz
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7. Start all the services.
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/etc/init.d/mysql start
/etc/init.d/httpd startssl
/etc/init.d/cpanel start
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