C H A P T E R in .NET

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C H A P T E R
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Monitoring Access to Apache
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In This
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Monitoring Apache status Enabling logging Customizing logging Archiving your logs Tracking users Analyzing log files Maintaining your log files
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ave you ever wondered who is accessing your Web site Or how your Apache server is performing on your system Monitoring, logging, and analyzing Apache server can provide you with a great deal of information that is vital to the smooth system administration of the Web servers, and it can also help with the marketing aspects of your site In this chapter, I show you how to monitor and log information on an Apache server to satisfy your need to know Among other things, in this chapter I show you how to: Quickly access Apache server configurations Monitor the status of a running Apache server Create log files in both CLF and custom formats Analyze log files using third-party applications
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Monitoring Apache
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Apache enables you to monitor these two types of very valuable information via the Web: Server configuration information: This information is static, but being able to quickly access a running server s configuration information can be very useful when you want to find out what modules are installed on the server Server status: This information changes constantly Using Apache s Web-based server-status monitoring capabilities, you can monitor information such as the server s uptime, total requests served, total data transfer, status of child processes, and system resource usage
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I discuss both types of information in the following sections
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Accessing configuration information with mod_info
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System configuration information can be accessed via the mod_info module This module provides a comprehensive overview of the server configuration, including all installed modules and directives in the configuration files This module is contained in the mod_infoc file It is not compiled into the server by default You have to compile it using the --enable-info option with the configure script For example:
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/configure --prefix=/usr/local/apache \ --with-mpm=prefork \ --enable-info
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This command configures Apache to be installed on /usr/local/apache directory, configures the source to run as a preforking server, and enables the mod_info module Run make and make install to compile and install the newly built Apache server After you have installed this module in the server, you can view server configuration information via the Web by adding the following configuration to the httpdconf file:
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<Location /server-info> SetHandler server-info Order deny,allow Deny from all Allow from 127001 domaincom </Location>
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This allows the localhost (127001) and every host on your domain to access the server information Do not forget to replace the domaincom with your top-level domain name For example, if your Web site is wwwniteccom, you need to add:
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Allow from 127001 niteccom
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The dot in front of the domain name enables any host in the domain to access the server information However, if you wish to limit this to a single host called sysadmindomaincom, then change the Allow from line to:
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Allow from 127001 sysadmindomaincom
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After the server is configured and restarted, the server information is obtained from the localhost (that is, running a Web browser such as lynx on the server itself) by accessing http://localhost/server-info
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8 Monitoring Access to Apache
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This returns a full configuration page for the server and all modules If you wish to access it from a different location, use the fully qualified server name in place of localhost For example, if your Web server is called wwwniteccom, you access the server information by using http://wwwniteccom/server-info The mod_info module also provides a directive called AddModuleInfo, which enables you to add descriptive text in the module listing provided by the mod_info module The descriptive text could be anything including HTML text AddModuleInfo has this syntax:
AddModuleInfo module_name descriptive_text
For example:
AddModuleInfo mod_infoc See <a href= http://localhost/manual/mod/mod_infohtml >man mod_info</a>
This shows an HTML link next to the listing of mod_infoc, providing a quick way to get more information on the module from the Apache online manual, as shown below
Module Name: mod_infoc Content handlers: (code broken) Configuration Phase Participation: Create Server Config, Merge Server Configs Module Directives: AddModuleInfo - a module name and additional information on that module Current Configuration: AddModuleInfo mod_infoc man mod_info Additional Information: man mod_info
You can also limit the information displayed on the screen as follows: Server configuration only Use http://server/server-info server, which shows the following information:
Server Version: Apache/2014 (Unix) Server Built: Mar 14 2001 12:12:28 API Version: 20010224:1 Hostname/port: rhatniteccom:80 Timeouts: connection: 300 keep-alive: 15 MPM Information: Max Daemons: 20 Threaded: no Forked: yes Server Root: /usr/local/apache Config File: conf/httpdconf
Configuration for a single module Use http://server/server-info module_namec For example, to view information on only the mod_cgi module, run http://server/server-info mod_cgic, which shows the following information: