Comparison between Squid Proxy and Varnish Proxy

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Comparison in the roles of the Proxies

As a caching reverse proxy, Squid Proxy compares with other proxies such as the Apache with the mod Proxy, Varnish, and Nginx. A comparison between Squid and Varnish proxy portrays the application of the two have a variety of comparisons which are notable both in their properties. For starters, both Squid and Varnish are open source web supporting proxies that are used to perform a similar task of caching and forwarding the web proxy. Despite the notable differences between the two in reference to their area of application, they all play the same role which is essentially to improve on speed.

[blur] Although they adopt different practices in their undertaking with Squid opting for the reducing the bandwidth while varnish opting for compressions and optimizing on caching to improve the traffic of the websites (Varnish Software). The proxies do this since they are wired to reduce the load set on the applications of the web servers. In this way, both proxies facilitate a save on infrastructure by optimizing the server systems that should be relied upon in undertaking of requests (Nanda, Pranay, Shamsher and Saini 42). [/blur]

Scope of Application

[blur] The areas of application also do matter in these two proxies. The two systems can be applied in HTTP environment although squid tends to offer other additional packages such as FTP, HTTPS and more. The idea underlying such a similarity lies in the fact that these two systems are developed for purposes of handling cache based on the nature of the sites that they are being deployed to handle. Squid is more oriented to focus applications that are supported on the LAN and WAN in application that demand high performance, available and would be considered hostile environment such as YouTube, while Varnish is applied in websites that demand high traffic such as Facebook, Twitter and Wikipedia (Varnish Software; Squid-cache.org). [/blur]

Operating Environments

The operating platform has also been one of the main reason why these two systems are preferred. Although they do not serve similar operating systems. There are some comparable factors in the operating systems. Being the oldest one and having been developed over 20 years ago, Squid is available in almost all the operating systems including windows hence being applied much more (Squid-cache.org).

[blur] Varnish compares with squid in that it can be applied in multiple operating systems, with the exception of windows. However, Varnish is combined with Nginx facilitate its functionality in multiple operating systems. As an additional comparison factor, these two proxies are licensed by GNU GPL (Varnish Software). [/blur]


 Flexibility is also another important factor that impacts the success of these two applications. In addition to their performance, it is possible for an individual to develop the policies on how the income requests on their site should be addressed. Such policies can be relied upon to dictate the content that should be served, the manner in which they should be served and how the requests should be altered.

[blur] As one of the underlying properties that links these two reverse caching proxies, the full control of flushing out any cache remains with the user in these two cases. Some arguments have often been presented in reference to the ability of Squid being relied upon as both a reverse and a forward proxy which still portrays its flexibility. The same aspect of flexibility is visible on Varnish VCL in reference to customized modules, rules and solutions (Nanda, Pranay, Shamsher and Saini 42). [/blur]

Implementation of Content

The two proxies also can manage to perform to the expected standards simply because they can cache on different types of contents which includes the dynamically generated content. Dynamically generated content is often logically implemented relying on high level interpretations of bytecode compilations which are complex, different language and frameworks. The position behind this is that most of the non-trivial web sites are created to handle floods of requests which may affect the servers.

[blur] To prevent such an issue, either of these two proxies are applied to hide deficiencies by placing the cache inform of ones web server or on the flip side, these two proxies may limit access to some of the dynamically generated content such as Visitor counter, encrypted SSL content documents, and CGI pages. Ideally, these proxies have been built to accommodate that they cannot cache them as they may change once they have been accessed (Varnish Software; Squid-cache.org). [/blur]

Caching Behavior

[blur] Consistency in the caching behaviour is also another important attribute that has been built on these two reverse proxies. Initially in its earlier editions before varnish 44, Varnish did not accommodate the four main parameters such as Private, No cache, No store and Cache control. However, there has been the modelling of rules to accommodate for this challenge even in instances of the earlier VCL editions (Varnish Software). Squid also had this challenge which affected the determination of consistency. However, there have been different proposals such as squid storage deduplication and relying on local web servers (Squid-cache.org). [/blur]

Server Access in Case of Outage

[blur] The two proxies are also applicable in instances when there are outages such as in the episode where the server fails allowing the cache to continue running. Although Varnish is much more effective in this role since it allows for access of the cached content, Squid also allows for such an offline access of the systems in instances when the server fails despite the fact that an individual may face an odd browsing experience (Varnish Software; Squid-cache.org). [/blur]

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Works Cited

Ibm.com. "IBM Knowledge Centre." IBM. https://www.ibm.com/support/knowledgecenter/SS7K4U_8.5.5/com.ibm.websphere.edge.doc/cp/admingd31.html

Nanda, Pranay, Shamsher Singh, and G. L. Saini. "A Review of Web Caching Techniques and Caching Algorithms for Effective and Improved Caching." International Journal of Computer Applications 128.10 (2015): 41-45.

Squid-cache.org. "Squid: Optimising Web Delivery".  Squid-cache.org. http://www.squid-cache.org/

Varnish Software. "Varnish Cache - Varnish Software".  Varnish Software http://varnish.org/intro/index.html

Comparison between Squid Proxy and Varnish Proxy

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