THE VIRTUAL SERVER HANDBOOK

Please refer to the modules section in this chapter for more information on

Apache modules.

Hostname Lookups

The Apache web server by default is configured to keep a log of the clients

that access resources on your web site (this can be turned off). The log

includes the hostname (i.e. some.remote.host) or just the IP address (i.e.

32.64.128.16). Set the value to "off" to improve your server performance.

Additional latency is introduced into the server response process when the

web server is required to perform a hostname "lookup." Sites with even

moderate loads should leave this directive off, since hostname lookups can

take considerable amounts of time.

Note:  Use a log analysis tools such as WebTrends to look up

hostnames for IP addresses offline.

The following is an example:

HostnameLookups off

For more information, see:

http://www.apache.org/docs/mod/core.html#hostnamelookups

DNSMode

The 

DNSMode

 directive is equivalent to the 

HostNameLookups

directive. Use one or the other. Directive values include:

None

Minimum

Normal

maximum.

Historically, the default was normal. You should set the value to minimum

to improve server performance. This directive is inherited from NCSA

httpd.

The following is an example:

DNSMode minimum

For more information, see:

http://hoohoo.ncsa.uiuc.edu/docs/setup/httpd/DNSMode.html

ServerAdmin

The 

ServerAdmin

 directive assigns the e mail address the server includes

in error messages that it returns to the client.

The following is an example:

ServerAdmin webmaster@yourdomain.com

For more information, see:

http://www.apache.org/docs/mod/core.html#serveradmin

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