Apache IP-based Virtual Host x4c2h

What is IP-based virtual hosting 2z6m2m

IP-based virtual hosting is a method to apply different directives based on the IP address and port a request is received on. Most commonly, this is used to serve different websites on different ports or interfaces.

In many cases, Name-based vs. IP-based Virtual Hosts to help you decide.

System requirements 4p3x6x

As the term IP-based indicates, the server must have a different IP address/port combination for each IP-based virtual host. This can be achieved by the machine having several physical network connections, or by use of virtual interfaces which are ed by most modern operating systems (see system documentation for details, these are frequently called "ip aliases", and the "ifconfig" command is most commonly used to set them up), and/or using multiple port numbers.

In the terminology of Apache HTTP Server, using a single IP address but multiple T ports, is also IP-based virtual hosting.

How to set up Apache u4t3

There are two ways of configuring apache to multiple hosts. Either by running a separate httpd daemon for each hostname, or by running a single daemon which s all the virtual hosts.

Use multiple daemons when:

• There are security partitioning issues, such as company1 does not want anyone at company2 to be able to read their data except via the web. In this case you would need two daemons, each running with different ServerRoot settings.
• You can afford the memory and file descriptor requirements of listening to every IP alias on the machine. It's only possible to httpd could listen to N-1 of the addresses, and another could listen to the remaining address.)

Use a single daemon when:

• Sharing of the httpd configuration between virtual hosts is acceptable.
• The machine services a large number of requests, and so the performance loss in running separate daemons may be significant.

Setting up multiple daemons 5i2k4a

Create a separate Listen directive in the configuration file to select which IP address (or virtual host) that daemon services. e.g.

Listen 192.0.2.100:80

It is recommended that you use an IP address instead of a hostname (see DNS caveats).

Setting up a single daemon with virtual hosts 701q6f

For this case, a single CustomLog configuration directives to different values for each virtual host. e.g.

<VirtualHost 172.20.30.40:80>
    Server @www1.example.com
    DocumentRoot "/www/vhosts/www1"
    ServerName www1.example.com
    ErrorLog "/www/logs/www1/error_log"
    CustomLog "/www/logs/www1/access_log" combined
</VirtualHost>

<VirtualHost 172.20.30.50:80>
    Server @www2.example.org
    DocumentRoot "/www/vhosts/www2"
    ServerName www2.example.org
    ErrorLog "/www/logs/www2/error_log"
    CustomLog "/www/logs/www2/access_log" combined
</VirtualHost>

It is recommended that you use an IP address instead of a hostname in the <VirtualHost> directive (see DNS caveats).

Specific IP addresses or ports have precedence over their wildcard equivalents, and any virtual host that matches has precedence over the servers base configuration.

Almost any configuration directive can be put in the VirtualHost directive, with the exception of directives that control process creation and a few other directives. To find out if a directive can be used in the VirtualHost directive, check the directive index.

suEXEC wrapper is used.

SECURITY: When specifying where to write log files, be aware of some security risks which are present if anyone other than the that starts Apache has write access to the directory where they are written. See the security tips document for details.