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Rename

<!DOCTYPE html SYSTEM "about:legacy-compat">
<html lang="en"><head><META http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta content="width=device-width, initial-scale=1" name="viewport">

<title>mod_vhost_alias - Apache HTTP Server Version 2.4</title>
<link href="../../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet">
<link href="../../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size">
<link href="../../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css"><link rel="stylesheet" type="text/css" href="../../style/css/prettify.css">
<script src="../../style/scripts/prettify.min.js">
</script>

<p>This module creates dynamically configured virtual hosts, by
    allowing the IP address and/or the <code>Host:</code> header of
    the HTTP request to be used as part of the pathname to
    determine what files to serve. This allows for easy use of a
    huge number of virtual hosts with similar configurations.</p>

<div class="note"><h3>Note</h3>
      <p>If <code class="module"><a href="../mod/mod_alias.html">mod_alias</a></code> or <code class="module"><a href="../mod/mod_userdir.html">mod_userdir</a></code> are
      used for translating URIs to filenames, they will override the
      directives of <code class="module"><a href="../mod/mod_vhost_alias.html">mod_vhost_alias</a></code> described below. For
      example, the following configuration will map <code>
      /cgi-bin/script.pl</code> to <code>
      /usr/local/apache2/cgi-bin/script.pl</code> in all cases:</p>

<pre class="prettyprint lang-config">ScriptAlias "/cgi-bin/" "/usr/local/apache2/cgi-bin/"
VirtualScriptAlias "/never/found/%0/cgi-bin/"</pre>

</div>
</div>
<div id="quickview"><h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="../../images/down.gif"> <a href="#interpol">Directory Name Interpolation</a></li>
<li><img alt="" src="../../images/down.gif"> <a href="#examples">Examples</a></li>
</ul><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../../images/down.gif"> <a href="#virtualdocumentroot">VirtualDocumentRoot</a></li>
<li><img alt="" src="../../images/down.gif"> <a href="#virtualdocumentrootip">VirtualDocumentRootIP</a></li>
<li><img alt="" src="../../images/down.gif"> <a href="#virtualscriptalias">VirtualScriptAlias</a></li>
<li><img alt="" src="../../images/down.gif"> <a href="#virtualscriptaliasip">VirtualScriptAliasIP</a></li>
</ul>
<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_vhost_alias">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_vhost_alias">Report a bug</a></li></ul><h3>See also</h3>
<ul class="seealso">
<li><code class="directive"><a href="../mod/core.html#usecanonicalname">UseCanonicalName</a></code></li>
<li><a href="../vhosts/mass.html">Dynamically configured mass
    virtual hosting</a></li>
</ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../../images/up.gif"></a></div>
<div class="section">
<h2 id="interpol">Directory Name Interpolation <a title="Permanent link" href="#interpol" class="permalink">&para;</a></h2>

<p>All the directives in this module interpolate a string into
    a pathname. The interpolated string (henceforth called the
    "name") may be either the server name (see the <code class="directive"><a href="../mod/core.html#usecanonicalname">UseCanonicalName</a></code>
    directive for details on how this is determined) or the IP
    address of the virtual host on the server in dotted-quad
    format. The interpolation is controlled by specifiers inspired
    by <code>printf</code> which have a number of formats:</p>

<div class="note"><h3>Note</h3>
    <p>The interpolated directory must be an absolute path. The
    special value <code>none</code> can be used to disable the
    directive.</p>
    </div>

<table>

<tr><td><code>%%</code></td>
<td>insert a <code>%</code></td></tr>

<tr><td><code>%p</code></td>
<td>insert the port number of the virtual host</td></tr>

<tr><td><code>%N.M</code></td>
<td>insert (part of) the name</td></tr>

</table>

<p><code>N</code> and <code>M</code> are used to specify
    substrings of the name. <code>N</code> selects from the
    dot-separated components of the name, and <code>M</code>
    selects characters within whatever <code>N</code> has selected.
    <code>M</code> is optional and defaults to zero if it isn't
    present; the dot must be present if and only if <code>M</code>
    is present. The interpretation is as follows:</p>

<table>
      
      <tr><td><code>0</code></td>
      <td>the whole name</td></tr>

<tr><td><code>1</code></td>
      <td>the first part</td></tr>

<tr><td><code>2</code></td>
      <td>the second part</td></tr>

<tr><td><code>-2</code></td>
      <td>the penultimate part</td></tr>

<tr><td><code>2+</code></td>
      <td>the second and all subsequent parts</td></tr>

<tr><td><code>-2+</code></td>
      <td>the penultimate and all preceding parts</td></tr>

<p>If <code>N</code> or <code>M</code> is greater than the number
    of parts available a single underscore is interpolated. </p>

</div><div class="top"><a href="#page-header"><img alt="top" src="../../images/up.gif"></a></div>
<div class="section">
<h2 id="examples">Examples <a title="Permanent link" href="#examples" class="permalink">&para;</a></h2>

<p>For simple name-based virtual hosts you might use the
    following directives in your server configuration file:</p>

<pre class="prettyprint lang-config">UseCanonicalName    Off
VirtualDocumentRoot "/usr/local/apache/vhosts/%0"</pre>

<p>A request for
    <code>http://www.example.com/directory/file.html</code> will be
    satisfied by the file
    <code>/usr/local/apache/vhosts/www.example.com/directory/file.html</code>.
    </p>

<p>For a very large number of virtual hosts it is a good idea
    to arrange the files to reduce the size of the
    <code>vhosts</code> directory. To do this you might use the
    following in your configuration file:</p>

<pre class="prettyprint lang-config">UseCanonicalName    Off
VirtualDocumentRoot "/usr/local/apache/vhosts/%3+/%2.1/%2.2/%2.3/%2"</pre>

<p>A request for
    <code>http://www.domain.example.com/directory/file.html</code>
    will be satisfied by the file
    <code>/usr/local/apache/vhosts/example.com/d/o/m/domain/directory/file.html</code>.</p>

<p>A more even spread of files can be achieved by hashing from the
    end of the name, for example: </p>

<pre class="prettyprint lang-config">VirtualDocumentRoot "/usr/local/apache/vhosts/%3+/%2.-1/%2.-2/%2.-3/%2"</pre>

<p>The example request would come from
    <code>/usr/local/apache/vhosts/example.com/n/i/a/domain/directory/file.html</code>.</p>

<p>Alternatively you might use: </p>

<pre class="prettyprint lang-config">VirtualDocumentRoot "/usr/local/apache/vhosts/%3+/%2.1/%2.2/%2.3/%2.4+"</pre>

<p>The example request would come from
    <code>/usr/local/apache/vhosts/example.com/d/o/m/ain/directory/file.html</code>.</p>

<p> A very common request by users is the ability to point multiple domains to multiple 
document roots without having to worry about the length or number of parts of the 
hostname being requested. If the requested hostname is <code>sub.www.domain.example.com</code>
 instead of simply <code>www.domain.example.com</code>, then using %3+ will result in the document
root being <code>/usr/local/apache/vhosts/domain.example.com/...</code> instead of the
intended <code>example.com</code> directory. In such cases, it can be beneficial to use 
the combination <code>%-2.0.%-1.0</code>, which will always yield the domain name and the 
tld, for example <code>example.com</code> regardless of the number of subdomains appended 
to the hostname. As such, one can make a configuration that will direct all first, second 
or third level subdomains to the same directory:
</p>
<pre class="prettyprint lang-config">VirtualDocumentRoot "/usr/local/apache/vhosts/%-2.0.%-1.0"</pre>

<p>
In the example above, both <code>www.example.com</code> as well as <code>www.sub.example.com</code>
or <code>example.com</code> will all point to <code>/usr/local/apache/vhosts/example.com</code>.
</p>

<p>For IP-based virtual hosting you might use the following in
    your configuration file:</p>

<pre class="prettyprint lang-config">UseCanonicalName DNS
VirtualDocumentRootIP "/usr/local/apache/vhosts/%1/%2/%3/%4/docs"
VirtualScriptAliasIP  "/usr/local/apache/vhosts/%1/%2/%3/%4/cgi-bin"</pre>

<p>A request for
    <code>http://www.domain.example.com/directory/file.html</code>
    would be satisfied by the file
    <code>/usr/local/apache/vhosts/10/20/30/40/docs/directory/file.html</code>
    if the IP address of <code>www.domain.example.com</code> were
    10.20.30.40. A request for
    <code>http://www.domain.example.com/cgi-bin/script.pl</code> would
    be satisfied by executing the program
    <code>/usr/local/apache/vhosts/10/20/30/40/cgi-bin/script.pl</code>.</p>

<p>If you want to include the <code>.</code> character in a
    <code>VirtualDocumentRoot</code> directive, but it clashes with
    a <code>%</code> directive, you can work around the problem in
    the following way:</p>

<pre class="prettyprint lang-config">VirtualDocumentRoot "/usr/local/apache/vhosts/%2.0.%3.0"</pre>

<p>A request for
    <code>http://www.domain.example.com/directory/file.html</code>
    will be satisfied by the file
    <code>/usr/local/apache/vhosts/domain.example/directory/file.html</code>.</p>

<p>The <code class="directive"><a href="../mod/mod_log_config.html#logformat">LogFormat</a></code>
    directives <code>%V</code> and <code>%A</code> are useful
    in conjunction with this module.</p>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../../images/up.gif"></a></div>
<div class="directive-section"><h2 id="virtualdocumentroot"><span id="VirtualDocumentRoot">VirtualDocumentRoot</span> Directive <a title="Permanent link" href="#virtualdocumentroot" class="permalink">&para;</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Dynamically configure the location of the document root
for a given virtual host</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>VirtualDocumentRoot <em>interpolated-directory</em>|none</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>VirtualDocumentRoot none</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_vhost_alias</td></tr>
</table>

<p>The <code class="directive">VirtualDocumentRoot</code> directive allows you to
    determine where Apache HTTP Server will find your documents based on the
    value of the server name. The result of expanding
    <em>interpolated-directory</em> is used as the root of the
    document tree in a similar manner to the <code class="directive"><a href="../mod/core.html#documentroot">DocumentRoot</a></code> directive's argument.
    If <em>interpolated-directory</em> is <code>none</code> then
    <code class="directive">VirtualDocumentRoot</code> is turned off. This directive
    cannot be used in the same context as <code class="directive"><a href="#virtualdocumentrootip">VirtualDocumentRootIP</a></code>.</p>

<div class="warning"><h3>Note</h3>
<code class="directive">VirtualDocumentRoot</code> will override any <code class="directive"><a href="../mod/core.html#documentroot">DocumentRoot</a></code> directives you may have put in the same 
context or child contexts. Putting a <code class="directive">VirtualDocumentRoot</code> 
in the global server scope will effectively override <code class="directive"><a href="../mod/core.html#documentroot">DocumentRoot</a></code> directives in any virtual hosts defined later 
on, unless you set <code class="directive">VirtualDocumentRoot</code> to <code>None</code> 
in each virtual host.
</div>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../../images/up.gif"></a></div>
<div class="directive-section"><h2 id="virtualdocumentrootip"><span id="VirtualDocumentRootIP">VirtualDocumentRootIP</span> Directive <a title="Permanent link" href="#virtualdocumentrootip" class="permalink">&para;</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Dynamically configure the location of the document root
for a given virtual host</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>VirtualDocumentRootIP <em>interpolated-directory</em>|none</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>VirtualDocumentRootIP none</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_vhost_alias</td></tr>
</table>

<p>The <code class="directive">VirtualDocumentRootIP</code> directive is like the
    <code class="directive"><a href="#virtualdocumentroot">VirtualDocumentRoot</a></code>
    directive, except that it uses the IP address of the server end
    of the connection for directory interpolation instead of the server
    name.</p>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../../images/up.gif"></a></div>
<div class="directive-section"><h2 id="virtualscriptalias"><span id="VirtualScriptAlias">VirtualScriptAlias</span> Directive <a title="Permanent link" href="#virtualscriptalias" class="permalink">&para;</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Dynamically configure the location of the CGI directory for
a given virtual host</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>VirtualScriptAlias <em>interpolated-directory</em>|none</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>VirtualScriptAlias none</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_vhost_alias</td></tr>
</table>

<p>The <code class="directive">VirtualScriptAlias</code> directive allows you to
    determine where Apache httpd will find CGI scripts in a similar
    manner to <code class="directive"><a href="#virtualdocumentroot">VirtualDocumentRoot</a></code> does for other documents. It matches
    requests for URIs starting <code>/cgi-bin/</code>, much like <code class="directive"><a href="../mod/mod_alias.html#scriptalias">ScriptAlias</a></code>
    <code>/cgi-bin/</code> would.</p>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../../images/up.gif"></a></div>
<div class="directive-section"><h2 id="virtualscriptaliasip"><span id="VirtualScriptAliasIP">VirtualScriptAliasIP</span> Directive <a title="Permanent link" href="#virtualscriptaliasip" class="permalink">&para;</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Dynamically configure the location of the CGI directory for
a given virtual host</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>VirtualScriptAliasIP <em>interpolated-directory</em>|none</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>VirtualScriptAliasIP none</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_vhost_alias</td></tr>
</table>

<p>The <code class="directive">VirtualScriptAliasIP</code> directive is like the
    <code class="directive"><a href="#virtualscriptalias">VirtualScriptAlias</a></code>
    directive, except that it uses the IP address of the server end
    of the connection for directory interpolation instead of the server
    name.</p>

</div>
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