Tips and Tricks
What is the /proc/kcore?
/proc/kcore is the Server memory. You aren't going to save any disk space by trying to remove it.
It is the 'image' file for all your memory; this actually contains the data and information that is currently in your physical RAM.
/proc/kcore is an image of the RAM of the Server. The entire /proc file system does not exist on the disk. Instead, it is a collection of files that the kernel generates on the fly to give information on different processes, and other information.
If the sight of it bothers you (or if you don't want nosy people reading what's in you RAM) you can disable /proc support in your kernel.