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Leafnode is a NTTP news server designed for small networks that may have slow connections to the Internet. You can obtain the Leafnode software package along with documentation from its Web site at www.leafnode.org. You can also download it from software repositories like freshmeat.net or linuxapps.com. Along with the Leafnode NNTP server, the software package includes several utilities such as Fetchnews, Texpire, and Newsq. Fetchnews retrieves and sends articles to your upstream news servers. Texpire deletes old news, and Newsq shows articles waiting to be sent out. Leafnode is tailored to very low usage requirements. Only newsgroups that users on your local network have accessed within the last week are actually downloaded. Newsgroups not accessed in over a week are no longer downloaded. Its usage levels are comparable to a news client, accessing only the news that users on your network want. For a small network, this means having the advantages of a news service with few of the disadvantages. Much less disk space is used and less time is needed to download newsfeeds. Note Slrnpull is a simple single-user version of Leafnode that can be used only with the slrn newsreader. With it, you can use to automatically download articles in specified newsgroups from your network's news server and view them offline (see 18). Configuring Leafnode is a relatively simple process. You need to enter news server information in the Leafnode configuration file and make sure that there is a file for Leafnode in the xinetd.d directory so that users on your network can access it. The Leafnode configuration file is /etc/leafnode/config. You can edit this file directly or use one of several GUI Leafnode configuration utilities such as Keafnode or leafwa. Keafnode is a KDE program that provides a simple dialog box to configure your Leafnode servers, expire messages in selected newsgroups, and control download operations. leafwa provides a Webpage-based interface letting you configure Leafnode using any Web browser. You can think of Leafnode as more of a news client that provides news server services to a small local network. It assumes that you already have a connection to a larger network such as the Internet and to an NNTP news server on that network. You then configure Leafnode to download newsgroup articles from that NNTP news server. In the Leafnode configuration file, you need to specify the name of that NNTP news server in the server entry, as shown here:
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If you have access to other news servers, you can list them in the supplement entry:
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If you need a username and password to access the news server, you can list them in username and password entries following the server entry:
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In the configuration file, you can also specify a default expiration time for unread newsgroup articles:
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The Leafnode server does not perform the task of downloading articles. For this task, use Fetchnews. Fetchnews will download articles for specified newsgroups from the NNTP news server and send posted articles to it submitted by users on your local network. Similarly, you use the Texpire application to expire articles that have been previously downloaded. You can further automate these operations by scheduling them in a Leafnode crontab file, leafnode.crontab. To allow users on your network to access the Leafnode server set up for them, you place a file for it in the xinetd.d directory that would call /user/local/sbin/leafnode.
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Squid Proxy-Caching Server
Squid is a proxy-caching server for Web clients, designed to speed Internet access and provide security controls for Web servers. It implements a proxy-caching service for Web clients that caches Web pages as users make requests. Copies of Web pages accessed by users are kept in the Squid cache and, as requests are made, Squid checks to see if it has a current copy. If Squid does have a current copy, it returns the copy from its cache instead of querying the original site. In this way, Web browsers can then use the local Squid cache as a proxy HTTP server. Squid currently handles Web pages supporting the HTTP, FTP, Gopher, SSL, and WAIS protocols (Squid cannot be used with FTP clients). Replacement algorithms periodically replace old objects in the cache. As a proxy, Squid does more that just cache Web objects. It operates as an intermediary between the Web browsers (clients) and the servers they access. Instead of connections being made directly to the server, a client connects to the proxy server. The proxy then relays requests to the Web server. This is useful for situations where a Web server is placed behind a firewall server, protecting it from outside access. The proxy is accessible on the firewall, which can then transfer requests and responses back and forth between the client and the Web server. The design is often used to allow Web servers to operate on protected local networks and still be accessible on the Internet. You can also use a Squid proxy to provide Web access to the Internet by local hosts. Instead of using a gateway providing complete access to the Internet, local hosts could use a proxy to allow them just Web access (see 7). You could also combine the two, allowing gateway access, but using the proxy server to provide more control for Web access. In addition, the caching capabilities of Squid would provide local hosts with faster Web access. Technically, you could use a proxy server to simply manage traffic between a Web server and the clients that want to communicate with it without doing caching at all. Squid combines both capabilities as a proxy-caching server. Squid also provides security capabilities that let you exercise control over hosts accessing your Web server. You can deny access by certain hosts and allow access by others. Squid also
supports the use of encrypted protocols such as SSL (see 39). Encrypted communications are tunneled through (passed through without reading) the Squid server directly to the Web server. Squid is supported and distributed under a GNU Public License by the National Laboratory for Applied Network Research (NLANR) at the University of California, San Diego. The work is based on the Harvest Project to create a Web indexing system that included a highperformance cache daemon called cached. You can obtain current source code versions and online documentation from the Squid home page at http://squid.nlanr.net and the Squid FTP site at ftp.nlanr.net. The Squid software package consists of the Squid server, a domain name lookup program called dnsserver, an FTP client called ftpget, and a cache manager script called cachemgr.cgi. The dnsserver resolves IP addresses from domain names, and the ftpget program is an FTP client Squid uses to retrieve files from FTP servers. cachemgr.cgi lets you view statistics for the Squid server as it runs. On Red Hat, you can start, stop, and restart the squid server using the squid service script, as shown here:
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