Why is /proc/kcore so big?
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Note: On 64-bit systems the size of /proc/kcore is even 128TB because that's the absolute limit of what 64-bit systems can allocate.
Certain services run in a so-called change root (short chroot) environment. This is done mainly for security reasons. The chroot environment means that the service only sees the files below a certain directory. For NTP this is /var/lib/ntp. NTPs root in this case is /var/lib/ntp. Since it might need access to certain files below /proc/ it mounts /proc below its own root file system again. You can see that when you use the command 'mount' and you will see a line like this:
/proc on /var/lib/ntp/proc type proc (ro)
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- Document ID:7004153
- Creation Date: 11-Aug-2009
- Modified Date:03-Mar-2020
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