Squid cache file

Squid can reduce your server load and improve delivery speeds to clients. Squid can also be used to deliver content from around the world - copying only the content being used, rather than inefficiently copying everything.

Finally, Squid's advanced content routing configuration allows you to build content clusters to route and load balance requests via a variety of web servers. The Squid project provides a number of resources to assist users design, implement and support Squid installations.

Get your disk fragmented, and it will most likely be your worst bottleneck, by far offsetting the modest gain you got by having more storage. Let's see an example: you have a 9Gb disk these times they're even hard to find.. First thing, manifacturers often lie about disk capacity the whole Megabyte vs Mebibyte issue , and then the OS needs some space for its accounting structures, so you'll reasonably end up with 8Gib of useable space.

If you're getting "disk full" write errors, then you definitely need to decrease your cache size. Several people on both the fwtk-users and the squid-users mailing asked about using Squid in combination with http-gw from the TIS toolkit. The most elegant way in my opinion is to run an internal Squid caching proxyserver which handles client requests and let this server forward it's requests to the http-gw running on the firewall.

Cache hits won't need to be handled by the firewall. In this example Squid runs on the same server as the http-gw, Squid uses and http-gw uses web. The local domain is home. Below, access.

The firewall doesn't need to run large applications like Squid. The internal Squid-server still gives you the benefit of caching. Disadvantages: The internal Squid proxyserver can't and shouldn't work with other parent or neighbor caches.

Initial requests are slower because these go through http-gw, http-gw also does reverse lookups. Run a nameserver on the firewall or use an internal nameserver. Security - X-Forwarded-For When a proxy-cache is used, a server does not see the connection coming from the originating client. Many people like to implement access controls based on the client address. If all this traffic ended up in the cache, in one hour it would add up to MB. Assuming that all this traffic is generated in only eight working hours, it would reach 3.

Because the connection is normally not used to its upper volume limit, it can be assumed that the total data volume handled by the cache is approximately 2 GB. Hence, in this example, 2 GB of disk space is required for Squid to keep one day's worth of browsing data cached. Speed plays an important role in the caching process, so this factor deserves special attention. For use as a proxy server, hard disks with high rotation speeds or SSDs are the best choice.

When using hard disks, it can be better to use multiple smaller hard disks, each with a single cache directory to avoid excessive read times. Using a RAID system allows increasing reliability at expense of speed. However, for performance reasons, avoid software RAID5 and similar settings. File system choice is usually not decisive. However, using the mount option noatime can improve performance—Squid provides its own time stamps and thus does not need the file system to track access times.

If not already installed, install the package squid. To ensure a smooth start-up, the network should be configured in a way that at least one name server and the Internet can be reached. Problems can arise if a dial-up connection is used with a dynamic DNS configuration. If you want Squid to start when the system boots up, enable the service with systemctl enable squid.

The output of this command should indicate that Squid is loaded and active running. The output of this command should be 0 , but may contain additional warnings or messages. To test the functionality of Squid on the local system, choose one of the following ways:. To test, you can use squidclient , a command-line tool that can output the response to a Web request, similar to wget or curl. Unlike those tools, squidclient will automatically connect to the default proxy setup of Squid, localhost However, if you changed the configuration of Squid, you need to configure squidclient to use different settings using command line options.

For more information, see squidclient --help. The output shown in Example The example above contains two X-Cache lines. You can ignore the first X-Cache header. It is produced by the internal caching software of the originating Web server. Using a browser: Set up localhost as the proxy and as the port. You can then load a page and check the response headers in the Network panel of the browser's Inspector or Developer Tools.

The headers should be reproduced similarly to the way shown in Example However, in doing so, consider that Squid is made completely accessible to anyone by this action. Therefore, define ACLs access control lists that control access to the proxy server. After modifying the configuration file, Squid must be reloaded or restarted. For more information on ACLs, see Section Terminating Squid with kill or killall can damage the cache.

To be able to restart Squid, damaged caches must be deleted. Removing Squid from the system does not remove the cache hierarchy and log files. Setting up a local DNS server makes sense even if it does not manage its own domain. It then simply acts as a caching-only name server and is also able to resolve DNS requests via the root name servers without requiring any special configuration see Section How this can be done depends on whether you chose dynamic DNS during the configuration of the Internet connection.

This way, Squid can always find the local name server when it starts. With static DNS, no automatic DNS adjustments take place while establishing a connection, so there is no need to change any sysconfig variables. Defines settings in regard to cache memory, maximum and minimum object size, and more.

Define paths to access, cache, and cache store log files in addition with connection timeouts and client lifetime. To start Squid for the first time, no changes are necessary in this file, but external clients are initially denied access. The proxy is available for localhost. The default port is Many entries are commented and therefore begin with the comment character.

The relevant specifications can be found at the end of the line. The given values usually correlate with the default values, so removing the comment signs without changing any of the parameters usually has no effect. If possible, leave the commented lines as they are and insert the options along with the modified values in the line below. This way, the default values may easily be recovered and compared with the changes.

Sometimes, Squid options are added, removed, or modified. Therefore, if you try to use the old squid. Zumo de Vidrio 2 2 silver badges 14 14 bronze badges.

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