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The ProFTPD daemon can manage more than one FTP site at once. Using a VirtualHost directive in the proftpd.conf file, you can create an independent set of directives that configure a separate FTP server. The VirtualHost directive is usually used to configure virtual servers as FTP sites. You can configure your system to support more than one IP address. The
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extra IP addresses can be used for virtual servers, not independent machines. You can use such an extra IP address to set up a virtual FTP server, giving you another FTP site on the same system. This added server would use the extra IP address as its own. Remote users could access it using that IP address, instead of the system's main IP address. Because such an FTP server is not running independently on a separate machine but is, instead, on the same machine, it is known as a virtual FTP server or virtual host. This feature lets you run what appears to others as several different FTP servers on one machine. When a remote user uses the virtual FTP server's IP address to access it, the ProFTPD daemon detects that request and operates as the FTP service for that site. ProFTPD can handle a great many virtual FTP sites at the same time on a single machine. Note Given its configuration capabilities, you can also tailor any of the virtual FTP sites to specific roles, such as a guest site, an anonymous site for a particular group, or an anonymous site for a particular user. You configure a virtual FTP server by entering a <VirtualHost> directive for it in your proftpd.conf file. Such an entry begins with the VirtualHost directive and the IP address, and ends with a terminating VirtualHost directive, </VirtualHost>. Any directives placed within these are applied to the virtual host. For anonymous or guest sites, add Anonymous and Guest directives. You can even add Directory directives for specific directories. With the Port directive on a standalone configuration, you can create a virtual host that operates on the same system but connects on a different port.
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<VirtualHost 10.0.0.1> ServerName "My virtual FTP server" </VirtualHost>
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Xinetd and standalone configurations handle virtual hosts differently. Xinetd detects a request for a virtual host, and then hands it off to an FTP daemon. The FTP daemon then examines the address and port specified in the request and processes the request for the appropriate virtual host. In the standalone configuration, the FTP daemon continually listens for requests on all specified ports and generates child processes to handle ones for different virtual hosts as they come in. In the standalone configuration, ProFTPD can support a great many virtual hosts at the same time. The following example shows a sample configuration of a virtual FTP host. The VirtualHost directives use domain name addresses for their arguments. When a domain name address is used, it must be associated with an IP address in the network's domain name server. The IP address, in turn, has to reference the machine on which the ProFTPD daemon is running. On the ftp.mypics.com virtual FTP server, an anonymous guest account named robpics is configured that requires a password to log in. An anonymous FTP account is also configured that uses the home directory /var/ftp/virtual/pics.
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<VirtualHost ftp.mypics.com> ServerName "Mypics FTP Server" MaxClients 10 MaxLoginAttempts 1 DeferWelcome on <Anonymous ~robpics> User robpics Group robpics
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<Anonymous /var/ftp/virtual/pics> User ftp Group ftp UserAlias anonymous ftp </Anonymous> </VirtualHost>
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24: Red Hat Web Servers: Apache and Tux
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Red Hat provides several Web servers for use on your system. The primary Web server is Apache, which has almost become the standard Web server for Linux. It is a very powerful, stable, and fairly easy to configure system. Tux is smaller, but very fast, and can handle Web data that does not change with great efficiency. Red Hat provides default configurations for the Web servers, making them usable as soon as they are installed.
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Tux is a static content Web server designed to be run very fast from within the Linux kernel. In effect it runs in kernel space, making response times much faster than standard user-space Web servers like Apache. As a kernel-space server, Tux can handle static content such as images very efficiently. At the same time it can coordinate with a user-space Web server, like Apache, to provide the dynamic content, like CGI programs. Tux can even make use of a cache to hold previously generated dynamic content, using it as if it were static. The ability to coordinate with a user-space Web server lets you use Tux as your primary Web server. Anything that Tux cannot handle, it will pass off to the user-space Web server. Note Tux is freely distributed under the GNU Public License and is included with Red Hat distributions. The Tux configuration file is located in /proc/sys/net/tux. Here you enter parameters such as serverport, max_doc_size, and logfile (check the Tux reference manual at www.redhat.com/support/manuals for a detailed listings). Red Hat defaults are already entered. serverport, clientport, and documentroot are required parameters that must be set. serverport is the port Tux will use-80 if it is the primary Web server. clientport is the port used by the user-space Web server Tux coordinates with, like Apache. documentroot specifies the root directory for your Web documents (/var/www/html on Red Hat). Ideally, Tux is run as the primary Web server and Apache as the secondary Web server. To configure Apache to run with Tux, the port entry in the Apache httpd.conf file needs to be changed from 80 to 8080.
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