HostNameLookups is where Apache does a reverse DNS lookup for every connecting client’s IP address. In addition to on and off there is also a double option that does a reverse lookup followed by a forward one to see if the host name matches the IP address.
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apache optimization
Apache expires module
The Apache expires module, also known as mod_expires, allows you to fine tune “Expires” and “Cache-Control” HTTP headers sent with files served by Apache. These HTTP headers provide information for browsers and caching proxy servers on how long to cache content served by Apache.
Apache MaxClients
Apache web server has a configuration option called MaxClients. MaxClients determines the maximum number of concurrent connections that Apache will service.
Apache optimization: KeepAlive On or Off?
Apache is the most widely used web server on the Internet. Knowing how to get the most out of Apache is very important for a systems administrator. Optimizing Apache is always a balancing act. It’s a case of sacrificing one resource in order to obtain savings in another.