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    web server web server Presentation Transcript

    • WEB SERVER
    • Table of contents Overview Features Virtual hosting Large file support Bandwidth throttling Server-side scripting Path translation Load limits Services Top web servers Apache web server Microsoft web server Protocols used My conclusion
    • Web server It is a computer program It delivers content such as web pages The primary function of a web server is to deliver web pages to clients.
    • Cont…
      • A client, commonly a web browser initiates communication by making a request for a specific resource using HTTP
      • the server responds with the content of that resource
      • Otherwise display error message if unable to do so
    • Cont...
      • It is not always used for serving WWW
      • Also be found embedded in devices such as
      • Printers
      • Routers
      • Web cams
      • Serving a local network
    • Cont.... It is used as a part of a system for monitoring and administrating the device.
    • Common features
      • Virtual hosting
      • Large file support
      • Bandwidth throttling
      • Server-side scripting
      • Virtual hosting
      • It is for hosting multiple
      • domain names using a
      • single IP address.
      • This allows one machine
      • to share its resources such
      • as
      • Memory
      • Processor cycle
      • use its resources more efficiently.
    • Domain name
      • A name that identifies one or more IP addresses.
      • For example the domain name microsoft.com represents about a dozen IP addresses.
      • Domain names are used in URLs to identify particular Web pages.
      • For example, in the URL
      • http://www.pcwebopedia.com/index.html
      • the domain name is pcwebopedia.com.
      • Large file support
      • Large file support to be able to serve files whose size is greater than 2 GB on 32 bit OS
      • .
      • Bandwidth throttling
      • It is to limit the speed of responses in order to not saturate the network
      • Its to be able to serve more clients.
      • Server-side scripting
      • web server technology
      • its running a script directly on the web server to generate dynamic web pages.
      • It is usually used to provide interactive web sites
    • Path translation
      • Web servers are able to map the path component of a URL into:
      • for static request
      • a local file system resource
      • for dynamic requests
      • an internal or external program name
    • Load limits
      • it can handle only a limited number of concurrent client connections
      • usually between 2 and 80,000, by default between 500 and 1,000 per IP address
    • Kernel-mode vs User-mode web server
      • will usually work faster
      • it can directly use all the hardware resources it needs, such as non-paged memory, CPU time-slices, network adapters, or buffers.
      • will usually work slowly compared to that
      • Ask permission to the system to use more memory or more CPU resource
    • Overload causes
      • Too much Web traffic
      • Computer worms
      sometimes cause abnormal traffic because of millions of infected computers
      • XSS viruses
      can cause high traffic because of millions of infected browsers and/or Web servers;
      • Internet (network) slowdowns.
      that client requests are served more slowly and the number of connections increases so much that server limits are reached;
    • Overload symptoms
      • requests are served with delays
      (from 1 second to a few hundred seconds);
      • 500, 502, 503, 504 ,404HTTP errors are returned to clients
      • TCP connections are refused or reset before any content is sent to clients
      • In very rare cases, only partial contents are sent
    • Too much traffic
    • Error
    • Anti-overload techniques Managing network traffic, by using : * Firewalls to block unwanted traffic coming from bad IP sources or having bad patterns. * HTTP traffic managers to drop, redirect or rewrite requests having bad HTTP patterns. * Bandwidth management and traffic shaping , in order to smooth down peaks in network usage.
    • Firewall protection
    • Trafiic usage
    • Bandwidth management
    • Market structure
        Top web servers
      • Apache
      • Microsoft
      • Igor Sysoev
      • Google
      • Lighttpd
        Percentage of use
      • 54%
      • 24%
      • 8%
      • 7%
      • 0.46%
    •  
    • Apache web server
      • Playing a key role in the initial growth of the World Wide Web
      • In 2009 it became the first web server software to surpass the 100 million web site milestone
      • Apache is developed and maintained by an open community of developers under Apache Software Foundation
    • Cont... The application is available for a wide variety of operating systems including
      • Unix
      • GNU
      • FreeBSD
      • Linux,
      • Solaris
      • Novell NetWare
      • Mac OS X
      • Microsoft Windows OS/2
      Released under the Apache License, Apache is characterized as open-source software.
    • Features
      • Common language interfaces support
      • Perl
      • Python
      • Tcl
      • PHP
      • Popular authentication modules include mod_access, mod_auth, mod_digest, and mod_auth_digest
    • Uses
      • Apache is primarily used to serve both static content and dynamic Web pages on the World Wide Web
      • Apache is used for many other tasks where content needs to be made available in a secure and reliable way
      • Programmers developing web applications often use a locally installed version of Apache in order to preview and test code as it is being developed.
    • Performance
      • Instead of implementing a single architecture, Apache provides a variety of MultiProcessing Modules (MPMs) which allow Apache to run in a process-based, hybrid or event-hybrid mode, to better match the demands of each particular infrastructure.
      • the design of Apache is to reduce latency and increase throughput
      • relative to simply handling more requests
      • Ensuring consistent and reliable processing of requests within reasonable time-frames.
    • Microsoft (iis) web server Execution Environment
      • Available to work only within the Windows environment.
      • With IIS 6.0 the only platform currently supported is Windows Server 2003.
    • Cont... it also provides a number of benefits including
      • greater cooperation with the host operating system
      • easier management
      • control through a variety of standard OS tools and utilities.
    • Apache... Execution Environment
      • Available on a variety of platforms, including Windows.
      • The redesign enables it to support a wide array of platforms in more efficient ways that lead toUnix- and Windows-specific execution models that make the best use of the OS.
    • Feature IIS Apache Independent Request Handler Yes Yes (limited) Multiple Process Request Handlers Yes Yes Thread Support Yes Yes (on a suitable OS)
    • Http protocol
      • The HTTP is used by web servers to communicate web pages to web browsers.
      • HTTP is used when your browser connects to a web server, requests a web page from the server, and downloads the page.
      • It is the common standard that enables any browser to connect to any server, anywhere in the world .
    • My conclusion
      • I can run the Apache web server on Windows XP and also in linux environment.
      • If i am going to use PHP or Perl for web sites,then Apache web server is best one because It supports both the languages
      And also the performance is better than others