[CentOS-mirror] Firewall Set-up for CentOS Mirror

Hello,
 
My name is Ken Young and I am working with the StarlingX Open Source community to set up a mirror of all our 3rd Party dependency code and CentOS.  We currently have a prototype running but we would like to harden the security measures we have in place for the server.  For example, we would like to move this server behind an external firewall.
 
Would you be willing to share what security hardening you have completed for your mirrors?  Any information would be greatly appreciated.
 
Thank you in advance.
 
Regards,
Ken Y
 
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