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Some things to note about the above segment: fcache turns on the caching module fcache_CacheTypes directive sets the MIME type for caching The sample configuration sets this to image/gif If you wish to cache all types of images, you can use image/* instead fcache_MaxSize sets the size of the cache Here the memory cache is set to 10MB (1024KB 10) Remember that you must have plenty of memory to cache files fcache_RecomputeTables directive sets the time in seconds to recompute the cache tables The default of 10 minutes is sufficient for most purposes
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To view cache statistics, you can create the following configuration: <Location /fcache-stats> SetHandler fcache-stats-handler </Location> and then go to the http://your_web_server/fcache-stats page
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Getting slick with the Squid proxy-caching server
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Squid is an open-source HTTP 11-compliant proxy-caching server that you can use to enhance your users Web-browsing experience You can download the latest stable Squid source distribution from wwwsquid-cacheorg Ideally, you want to run the proxy-caching server with two network interfaces One interface connects it to the Internet gateway or the router and the other one connects it to the internal network
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Disabling IP forwarding on the proxy-caching system ensures that no one can bypass the proxy server and access the Internet directly
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The following sections discuss installing and configuring Squid
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Compiling and installing Squid proxy-caching server
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To compile and install Squid, follow these steps: 1 As root, extract the source distribution using the tar xvzf suid-version targz (where version is the latest version number of the Squid software) 2 Run the /configure --prefix=/usr/local/squid command to configure Squid source code for your system 3 Run make all; make install to install Squid in /usr/local/squid directory
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Part VI Tuning for Performance and Scalability
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After you have installed Squid, you need to configure it (see the next section)
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Configuring Squid
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To configure Squid, follow these steps: 1 Create a group called nogroup by using the groupadd nogroup command This group will be used by Squid 2 Run the chown -R nobody:nogroup /usr/local/squid command to give the ownership of the /usr/local/squid directory and all its subdirectories to nobody user and to the group called nogroup This enables Squid (running as nobody user) to create cache directories and files and to write logs Modify the /usr/local/squid/etc/squidconf file as discussed in the following steps 3 Decide which port you want to run the proxy-cache on Because most sites run proxy-cache on 8080, I use this value here Add the following line in squidconf:
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http_port 8080
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This tells Squid to listen to port 8080 for proxy requests
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If you prefer a different port, use it here Be sure not to use a port that is already in use by another server Ideally, you want to use port numbers above 1024 to avoid collision with standard services, but if you know you are not running a Web server on port 80 and want to run your proxy-cache on that port, you can do so Also, a quick way to check whether a port is available is to run telnet localhost portnumber command where portnumber is the port number you want to use for proxy-cache If you get a connection failure message, the port is currently not in use
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4 You need to define where you want to keep the cache data Define the following line in the squidconf:
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cache_dir ufs /usr/local/squid/cache 100 16 256
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This tells Squid that you want to store the cache data in /usr/local/squid/ cache If you have a very large user base that will use this proxy-cache, it is a very good idea to have multiple cache directories spanning different drives This reduces drive I/O-related wait because multiple, independent drives are always faster than a single drive 5 Default Squid configuration does not allow any connection from anywhere; this is a security feature often known as deny everyone, allow only those who should have access So, you have to create an access control list (ACL) that enables your network to access to the proxy-cache For example, if your network address is 19216810 with subnet 2552552550, then you can define the following line in squidconf to create an ACL for your network:
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acl local_net src 19216810/2552552550
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