91 lines
5.8 KiB
HTML
91 lines
5.8 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="topic" />
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<meta name="DC.Title" content="Virtual hosts on HTTP Server" />
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<meta name="abstract" content="This topic provides information about virtual host types." />
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<meta name="description" content="This topic provides information about virtual host types." />
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<meta name="DC.Relation" scheme="URI" content="rzaieconcepts.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2002,2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2002,2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzaievirtualhosting" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Virtual hosts on HTTP Server </title>
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</head>
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<body id="rzaievirtualhosting"><a name="rzaievirtualhosting"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Virtual hosts on HTTP Server </h1>
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<div><p>This topic provides information about virtual host types.</p>
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<div class="important"><span class="importanttitle">Important:</span> Information
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for this topic supports the latest PTF levels for HTTP Server for i5/OS .
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It is recommended that you install the latest PTFs to upgrade to the latest
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level of the HTTP Server for i5/OS. Some of the topics documented here are
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not available prior to this update. See <a href="http://www-03.ibm.com/servers/eserver/iseries/software/http/services/service.html" target="_blank">http://www.ibm.com/servers/eserver/iseries/software/http/services/service.htm</a> <img src="www.gif" alt="Link outside Information Center" /> for more information. </div>
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<p>The concept of virtual hosts allows more than one Web site on one system
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or Web server. The servers are differentiated by their host name. Visitors
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to the Web site are routed by host name or IP address to the correct virtual
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host. Virtual hosting allows companies sharing one server to each have their
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own domain names. For example <em>www.company1.com</em> and <em>www.company2.com</em> can
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both be hosted on the same server. </p>
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<div class="section"><h4 class="sectiontitle">HTTP Server (powered by Apache) virtual host types</h4><p>There
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are three variations of virtual hosts on HTTP Server (powered by Apache):
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</p>
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<dl><dt class="dlterm">IP address-based virtual host </dt>
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<dd>The IP address-based virtual host requires one IP address per Web site
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(host name). This approach works very well, but requires a dedicated IP address
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for every virtual host. For more information on virtual hosts refer to the <a href="rzaiemod_core.htm#virtualhost"><VirtualHost></a> directive. </dd>
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</dl>
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<dl><dt class="dlterm">Name-based virtual host </dt>
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<dd>The name-based virtual host allows one IP address to host more than one
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Web site (host name). This approach allows practically an unlimited number
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of servers, ease of configuration and use, and requires no additional hardware
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or software. The main disadvantage to this approach is that the client must
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support HTTP 1.1 (or HTTP 1.0 with 1.1 extensions) that include the host name
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information inside the HTTP document requests. The latest versions of most
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browsers support HTTP 1.1 (or HTTP 1.0 with 1.1 extensions), but there are
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still old browsers that only support HTTP 1.0. For more information on virtual
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hosts refer to the <a href="rzaiemod_core.htm#virtualhost"><VirtualHost></a> directive. <p>For information
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on how to configure a name-based virtual host see <a href="rzaiejklvirtualhost.htm">JKL Toy Company creates virtual hosts on HTTP Server (powered by Apache)</a>. </p>
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</dd>
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</dl>
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<dl><dt class="dlterm">Dynamic virtual host </dt>
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<dd>The dynamic virtual host allows you to dynamically add Web sites (host
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names) by adding directories of content. This approach is based on automatically
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inserting the IP address and the contents of the Host: header into the pathname
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of the file that is used to satisfy the request. <p>The advantages of a
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dynamic virtual host are: </p>
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<ul><li>A smaller configuration file so that the server starts faster and uses
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less memory. </li>
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<li>Adding virtual hosts does not require the configuration to be changed
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or the server to be restarted. </li>
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</ul>
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<p>The disadvantage of a dynamic virtual host is that you cannot have
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a different log file for each virtual host. For more information on dynamic
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virtual hosts refer to <a href="rzaiemod_vhost_alias.htm">mod_vhost_alias</a>. </p>
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<p>For information
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on how to configure dynamic virtual hosts on HTTP Server (powered by Apache)
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see <a href="rzaieconfigvirtualhosts.htm">Set up virtual hosts on HTTP Server (powered by Apache)</a>. </p>
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</dd>
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</dl>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaieconcepts.htm" title="This topic provides concepts of functions on HTTP Server and IBM Web Administration for i5/OS interface.">Concepts of functions of HTTP Server</a></div>
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</div>
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</div>
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</body>
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</html>
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