Nginx Optimization, DNS Configuration, and Anti‑Hotlinking Setup on CentOS

Introduction

A reader failed a technical interview because they could not answer questions about Nginx optimization, anti‑hotlinking, and related security practices, so this guide revisits those topics with practical examples.

Topology

Three CentOS machines are used: Centos01 runs Nginx (domain www.h.com ), Centos02 runs Apache (domain www.hy.com ), and Centos03 provides DNS services.

Step 1 – Install Nginx on Centos01

# mount /dev/cdrom /mnt/

# useradd -M -s /sbin/nologin nginx

# rz   # receive nginx‑1.16.1 source package

# yum -y install pcre-devel zlib-devel

# tar -zxvf nginx‑1.16.1.tar.gz && cd nginx‑1.16.1

# vim src/core/nginx.h   # modify version strings

# vim src/http/ngx_http_header_filter_module.c   # change Server header

# ./configure --prefix=/usr/local/nginx --user=nginx --group=nginx --with-http_stub_status_module

# make && make install

# ln -s /usr/local/nginx/sbin/* /usr/local/sbin/

# nginx -t   # test configuration

# mkdir /www && echo "www.h.com" > /www/index.html