Today we will explain the process related to disabling prelinking. Prelinking not only causes issues quite often but also isn’t supported as of version 54 of cPanel & WHM. Enabling prelinking can lead to experiencing problems with broken RPMs.
So, what is “prelinking”? It is a method that is meant for optimizing application load times. This is achieved by resolving library symbols before launch. Libraries move around in memory. Hence, there is a performance penalty for resolution. There is an increase in this penalty for every additional library that needs resolution. This penalty is reduced by prelinking. It is attained by resolving libraries in advance. Post that, resolution only takes place if the libraries have changed after being prelinked, which can happen after an upgrade.
Autofixer
As of summer of 2016, an Autofixer script is shipped, which automatically disables prelinking. You need to create the /var/cpanel/dont_remove _prelink touchfile in order to keep the Autofixer from running, and keep on using prelinking on your server. You should run the following command for this purpose:
touch /var/cpanel/dont_remove_prelink
Manual Disabling of Prelinking
The following steps need to be carried out to disable prelinking:
Log in to your server. This has to be done via SSH.
Set the PRELINKING setting to no in the /etc/sysconfig/prelink file.
You need to run the below-mentioned command in order to implement your changes.
/etc/cron.daily/prelink
Now, you need to run the following command that is meant for verifying that your RPMs are functional. /usr/local/cpanel/scripts/check_cpanel_rpms –fix
The script won’t return output, if it succeeds.
This is how prelinking is disabled.
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