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Description of problem:
The number of file descriptiors used by squid is hardcoded to 16384 via a compile option in the spec file.
  182:     --with-filedescriptors=16384 \

This prevents raising the FD limit with e.g. LimitNOFILE in systemd's squid.service file. 

Version-Release number of selected component (if applicable):
squid-3.3.8-26.el7

How reproducible:
always

Steps to Reproduce:
1. add LimitNOFILE=32768 to [Service] section in squid.service
2. restart squid
3. check "open files" in /proc/<pid>/limits or squid's cache.log:

Actual results:
Max. number of open file descriptors still 16384.

Expected results:
LimitNOFILE directive honored

Additional info:
Duplicate of: https://bugzilla.redhat.com/show_bug.cgi?id=976815

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2016-2600.html