BP_104_en.md

Disable Apache DNS lookup

Identifiers

GreenIT	V2	V3	V4
84	100	1 04

Categories

Life cycle	Tiers	Responsible
4. Production	Datacenter	System Administrator

Indications

Priority	Implementation difficulty	Ecological impact
2	2	3

Saved resources
Processor / Network

Description

Web servers log information for all HTTP requests, usually translating users' IP addresses into domain names. This conversion (DNS Lookup) is one of Apache HTTP server's bottlenecks.

It should therefore be disabled.

Example

In your Apache server configuration file, located at /etc/apache/httpd.conf or at /etc/apache2/apache2.conf, write :

 HostnameLookups Off

Validation rule

The number of ...	is equal to or less than
active DNS lookups	0