Apache Module mod_status

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Description:	Provides information on server activity and performance
Status:	Base
Module Identifier:	status_module
Source File:	mod_status.c

Summary

The Status module allows a server administrator to find out how well their server is performing. A HTML page is presented that gives the current server statistics in an easily readable form. If required this page can be made to automatically refresh (given a compatible browser). Another page gives a simple machine-readable list of the current server state.

The details given are:

The number of worker serving requests
The number of idle worker
The status of each worker, the number of requests that worker has performed and the total number of bytes served by the worker (*)
A total number of accesses and byte count served (*)
The time the server was started/restarted and the time it has been running for
Averages giving the number of requests per second, the number of bytes served per second and the average number of bytes per request (*)
The current percentage CPU used by each worker and in total by Apache (*)
The current hosts and requests being processed (*)

The lines marked "(*)" are only available if ExtendedStatus is On.

Topics

Enabling Status Support
Automatic Updates
Machine Readable Status File

Comments

Enabling Status Support

To enable status reports only for browsers from the example.com domain add this code to your httpd.conf configuration file

<Location /server-status> SetHandler server-status Order Deny,Allow Deny from all Allow from .example.com </Location>

You can now access server statistics by using a Web browser to access the page http://your.server.name/server-status

Automatic Updates

You can get the status page to update itself automatically if you have a browser that supports "refresh". Access the page http://your.server.name/server-status?refresh=N to refresh the page every N seconds.

Machine Readable Status File

A machine-readable version of the status file is available by accessing the page http://your.server.name/server-status?auto. This is useful when automatically run, see the Perl program in the /support directory of Apache, log_server_status.

It should be noted that if mod_status is compiled into the server, its handler capability is available in all configuration files, including per-directory files (e.g., .htaccess). This may have security-related ramifications for your site.

ExtendedStatus Directive

Description:	Keep track of extended status information for each request
Syntax:	`ExtendedStatus On\|Off`
Default:	`ExtendedStatus Off`
Context:	server config
Status:	Base
Module:	mod_status
Compatibility:	ExtendedStatus is only available in Apache 1.3.2 and later.

This setting applies to the entire server, and cannot be enabled or disabled on a virtualhost-by-virtualhost basis. The collection of extended status information can slow down the server.

SeeRequestTail Directive

Description:	Determine if mod_status displays the first 63 characters of a request or the last 63, assuming the request itself is greater than 63 chars.
Syntax:	`SeeRequestTail On\|Off`
Default:	`SeeRequestTail Off`
Context:	server config
Status:	Base
Module:	mod_status
Compatibility:	Available in Apache 2.2.7 and later.

mod_status with ExtendedStatus On displays the actual request being handled. For historical purposes, only 63 characters of the request are actually stored for display purposes. This directive controls whether the 1st 63 characters are stored (the previous behavior and the default) or if the last 63 characters are. This is only applicable, of course, if the length of the request is 64 characters or greater.

If Apache is handling GET /disk1/storage/apache/htdocs/images/imagestore1/food/apples.jpg HTTP/1.1 mod_status displays as follows:

Off (default)	GET /disk1/storage/apache/htdocs/images/imagestore1/food/apples
On	orage/apache/htdocs/images/imagestore1/food/apples.jpg HTTP/1.1