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Web Server Administration


Web Server Administration Chapter 11 Monitoring and Analyzing the Web Environment Overview Monitor operating systems Monitor Web servers Monitor other Web ... – PowerPoint PPT presentation

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Title: Web Server Administration

Web Server Administration
  • Chapter 11
  • Monitoring and Analyzing the Web Environment

  • Monitor operating systems
  • Monitor Web servers
  • Monitor other Web applications
  • Learn about some analysis tools for Web servers

Monitoring Operating Systems
  • Typically you analyze log files
  • They contain information regarding certain events
  • Logs are used to detect problems
  • OS, application, or security problems
  • Various tools can monitor performance
  • Should create baseline at beginning of OS
    lifecycle for comparison purposes

Monitoring Windows
  • Performance monitoring allows you to compare
    system performance over time
  • You can set multiple counters and watch them in
  • Windows Task Manager highlights CPU and memory
  • You can modify services to notify you if a
    service fails

Windows Event Viewer
  • The event viewer contains six event types shown
    in the left pane

Windows Event Logs
  • System and application events display three
    levels of messages
  • Information
  • Warning
  • Error
  • Because many messages can be generated, a filter
    focuses on what you want to see
  • Over time, the logs fill up so you should clear
    them or save them

Monitoring Linux
  • Logging is controlled by the syslogd daemon
  • Facilities represent daemons that used syslogd
  • Most facilities are listed below
  • Apache uses local7

Eight Levels of Message Priorities in syslogd
Monitoring IIS
  • IIS has specific counters for use in the
    Performance Monitor
  • The System event viewer provides specific
  • If IIS did not start, you can find out why
  • IIS has extensive logging capabilities
  • Default log format used by various third-party
    applications that analyze logs
  • You can create custom logs

Sample IIS Log
Monitoring Apache Error Logs
  • By default, syslogd sends Apache messages to
  • Location of the error log
  • ErrorLog logs/error_log
  • logs refers to /var/log/httpd
  • You can create a different error log for each
    virtual host

Monitoring Apache Transfer Logs
  • Transfer logs tell you about the use of your Web
  • Default log based on combined format
  • Determined by the CustomLog directive in
  • There are a number of sample formats or you can
    create your own
  • By default, they are stored in /var/log/httpd/acce

Monitoring DNS
  • BIND uses a logging statement that you configure
    in named.conf
  • Define logging in two parts
  • Channel defines where logging is sent
  • Category defines what will be sent
  • If the channel is going to a file, use the
    versions option to define the number of backups
  • Size option sets maximum size of the file
  • print-time adds the date and time to the file

BIND Categories
BIND Logging Entry
  • logging
  • channel "techno_channel"
  • file "named.log" versions 4 size 10m
  • print-time yes
  • category "resolver"
  • "techno_channel"

Monitoring Exchange 2000
  • Uses Application portion of Event viewer
  • Should filter out informational messages because
    there are over 50 just when it starts
  • You can enable four types of logs
  • audit access to mailboxes
  • protocol commands used for SMTP, etc
  • message tracking senders and receivers
  • diagnostic analyze detailed problems

Analysis Tools for the Web Server
  • Analysis tools extract system data from logs and
    format the data
  • For IIS, one of the popular tools is WebTrends
    from NetIQ
  • Helps you determine the source of Web traffic
  • Determines which pages are most popular
  • Nearly 50 different reports
  • 123LogAnalyzer is available for both IIS and
  • Many reports are similar to WebTrends
  • However, you cannot compare reports over time

  • Monitoring operating systems typically involves
    performance monitor graphics and analyzing log
  • When monitoring systems, start with a baseline
  • In Windows, Event Viewer is the primary utility
  • BIND 9 DNS has extensive logging capability
  • Analysis tools take data in logs and help you
    make sense of it in an easy to read format
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