Apache HTTP Server Version 2.4
Apache HTTP Server Version 2.4
Available Languages: tr
This document describes when and how to use name-based virtual hosts.
Name-based vs. IP-based Virtual Hosts How the server selects the proper name-based virtual host Using Name-based Virtual Hosts
IP-based virtual hosts use the IP address of the connection to determine the correct virtual host to serve. Therefore you need to have a separate IP address for each host.
With name-based virtual hosting, the server relies on the client to report the hostname as part of the HTTP headers. Using this technique, many different hosts can share the same IP address.
Name-based virtual hosting is usually simpler, since you need only configure your DNS server to map each hostname to the correct IP address and then configure the Apache HTTP Server to recognize the different hostnames. Name-based virtual hosting also eases the demand for scarce IP addresses. Therefore you should use name-based virtual hosting unless you are using equipment that explicitly demands IP-based hosting. Historical reasons for IP-based virtual hosting based on client are no longer applicable to a general-purpose web server.
Name-based virtual hosting builds off of the IP-based virtual host selection algorithm, meaning that searches for the proper server name occur only between virtual hosts that have the best IP-based address.
It is important to recognize that the first step in name-based virtual host resolution is IP-based resolution. Name-based virtual host resolution only chooses the most appropriate name-based virtual host after narrowing down the candidates to the best IP-based match. Using a wildcard (*) for the IP address in all of the VirtualHost directives makes this IP-based mapping irrelevant.
When a request arrives, the server will find the best (most specific) matching ServerAlias directives to the server name present in the request.
If you omit the ServerName directive from any name-based virtual host, the server will default to a fully qualified domain name (FQDN) derived from the system hostname. This implicitly set server name can lead to counter-intuitive virtual host matching and is discouraged.
If no matching ServerName or ServerAlias is found in the set of virtual hosts containing the most specific matching IP address and port combination, then the first listed virtual host that matches that will be used.
| Related Modules | Related Directives |
|---|---|
The first step is to create a DocumentRoot directive to show where in the filesystem the content for that host lives.
Any request that doesn't match an existing <VirtualHost> is handled by the global server configuration, regardless of the hostname or ServerName.
When you add a name-based virtual host to an existing server, and the virtual host arguments match preexisting IP and port combinations, requests will now be handled by an explicit virtual host. In this case, it's usually wise to create a ServerName matching that of the base server. New domains on the same interface and port, but requiring separate configurations, can then be added as subsequent (non-default) virtual hosts.
It is best to always explicitly list a ServerName in every name-based virtual host.
If a ServerName in every name-based virtual host.
For example, suppose that you are serving the domain www.example.com and you wish to add the virtual host other.example.com, which points at the same IP address. Then you simply add the following to apache2.conf:
<VirtualHost *:80>
# This first-listed virtual host is also the default for *:80
ServerName www.example.com
ServerAlias example.com
DocumentRoot "/www/domain"
</VirtualHost>
<VirtualHost *:80>
ServerName other.example.com
DocumentRoot "/www/otherdomain"
</VirtualHost>
You can alternatively specify an explicit IP address in place of the * in <VirtualHost> directives. For example, you might want to do this in order to run some name-based virtual hosts on one IP address, and either IP-based, or another set of name-based virtual hosts on another address.
Many servers want to be accessible by more than one name. This is possible with the ServerAlias directive indicates that the listed names are other names which people can use to see that same web site:
ServerAlias example.com *.example.com
then requests for all hosts in the example.com domain will be served by the www.example.com virtual host. The wildcard characters * and ? can be used to match names. Of course, you can't just make up names and place them in ServerName or ServerAlias. You must first have your DNS server properly configured to map those names to an IP address associated with your server.
Name-based virtual hosts for the best-matching set of ServerAlias is used, with no different precedence for wildcards (nor for ServerName vs. ServerAlias).
The complete list of names in the ServerAlias.
Finally, you can fine-tune the configuration of the virtual hosts by placing other directives inside the <VirtualHost> container) will be used only if they are not overridden by the virtual host settings.
Available Languages: tr