[Koha] How to secure KOHA requests

[wahi]

Dear all,

Recently we are implemented KOHA on Ubuntu 16.04 everything is fine, the 
server has 16GB RAM but we are always seeing lack of RAM due to this 
process:

/usr/share/koha/opac/cgi-bin/opac/opac-search.pl

Is it something which can be restricted ? can we secure the requests to 
KOHA services using Apache ?


Thank you very much in advance for any suggestion or help.


Rgards,

  Wahi