Apache ppt

Apache ppt

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  APACHE An opensource web server. Mostly for Unix, Linux and Solaris platforms
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  Apache is themost popular web server on the net.
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  It is verysecure, fast, and reliable.
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  The name "Apache"derives from the word "patchy" that the Apache developers used to describe early versions of their software.
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  FEATURES Implements manyfrequently requested features, including:
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  DBM databases forauthentication
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  Customized responses toerrors and problems
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  Virtual Hosts
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  Multiple DirectoryIndex directives
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  It has beentested thoroughly by both developers and users.
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  APACHE WEB SERVERIt provides a full range of Web server features, including CGI, SSL, and virtual domains.It also supports plug-in modules for extensibility.
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  The Apache Web Server has HTTP
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  IIS
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  SSL
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  The Apache Webserver has been ported to Windows and other network operating systems (NOS). The Apache HTTP Server is web server software notable for playing a key role in the initial growth of the World Wide Web.
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  HTTP is anHypertext Transfer Protocol.
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  It provides astandard for Web browsers and servers to communicate.
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  The definition ofHTTP is a technical specification of a network protocol that software must implement.
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  HTTP is anapplication layer network protocol built on top of TCP. HTTP
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  HTTP clients (suchas Web browsers) and servers communicate via HTTP request and response messages.
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  The three mainHTTP message types are
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  GET, POST, andHEAD .
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  HTTP utilizes TCPport 80 by default
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  Though other portssuch as 8080 can alternatively be used.
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  The HTTP alsoincludes ARP-Address Resolution Protocol
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  DHCP-Dynamic Host ConfigurationProtocol
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  FTP-File Transfer Protocol
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  ARP ARP convertsan Internet Protocol (IP) address to its corresponding physical network address.
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  ARP is alow-level network protocol, operating at Layer 2 of the OSI model.
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  ARP is implementedusually in the device drivers of network operating systems.
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  It is mostcommonly seen on Ethernet networks, ATM, Token Ring, and other physical networks.
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  DHCP DHCP allowsa computer to join an IP-based network without having a pre-configured IP address.
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  DHCP is aprotocol that assigns unique IP addresses to devices, then releases and renews these addresses as devices leave and re-join the network.
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  FTP FTP allowsyou to transfer files between two computers on the Internet.
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  FTP is asimple network protocol based on Internet Protocol.
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  SSL Secure SocketsLayer
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  SSL security technologyhelps to improve the safety of Internet communications.
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  SSL is astandard for encrypted client/server communication between network devices.
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  A network protocol,SSL runs on top of TCP/IP.
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  SSL utilizes severalstandard network security techniques including public keys, symmetric keys, and certificates. Web sites commonly use SSL to guard private information such as credit card numbers.
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  CONFIGURATION Instead ofusing a point-and-click graphic user interface (GUI) or Windows Registry keys as most other modern software packages, Apache generally relies on simple text files for its configuration settings.
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  Configuring Files Apacheuses a system of three text files for managing its configuration data. All three of these files (almost always) appear in Apache's ./conf directory and are designed to be edited by system administrators: httpd.conf for general settings
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  srm.conf for resourcesettings
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  access.conf for securitysettings
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  In the mostrecent versions of Apache, the default installation has changed.
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  The httpd.conf istreated as the "master" configuration file and it contains all of the settings.
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  Both srm.conf andaccess.conf still exist in the installation, but they contain no settings and are empty except for some comments.
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  Like many UNIX-styleprograms, Apache will not re-read the .conf files after the Web server starts running.
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  After making changes,an administrator must restart Apache for the new settings to take effect.
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  Inside Httpd.conf Thehttpd.conf contained general settings such as the ServerName and Port number.
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  These entries appearas follows in the file:
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  ServerName compnetworking.about.comPort 80
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  The term "httpd"stands for HTTP Daemon .
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  This file containsa number of other entries (technically called directives), but for most of these, modifications are optional.
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  The most usefulof these entries is ServerAdmin -- it allows the administrator to set the email address that will be displayed on error pages (such a "404 pages") in the client's browser, giving users a way to contact someone if a site problem occurs: ServerAdmin compnetworking.guide@about.com
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  Running Apache Apachedoes not run from the inetd super server as many other network servers do.
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  It is configuredto run standalone for better performance for incoming HTTP requests from client web browsers.
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  A shell scriptwrapper is included to make starting, stopping, and restarting the server as simple as possible.
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  To start upApache for the first time, just run:
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  # /usr/local/sbin/apachectl start
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  You can stopthe server at any time by typing:
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  # /usr/local/sbin/apachectl stop
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  After making changesto the configuration file for any reason, you will need to restart the server:
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  # /usr/local/sbin/apachectl restart
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  To restart Apachewithout aborting current connections, run:
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  # /usr/local/sbin/apachectl graceful
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  *The family of.conf files supports most, but not all of Apache's configuration options. *Other important mechanisms for managing an Apache Web server include the . htaccess file,
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  the mime.types file,
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  and the familyof log files.
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  Thank You