Open source web caching solution

The requirements of a good caching layer are simplicity and low latency. But serving up data faster from your relational database is only one step toward creating a sustainable and comprehensive solution. Couchbase grows with you to handle more than just caching. As your source of truth solution, Couchbase delivers the extremely high levels of durability and reliability required to serve up critical data from multiple sources to your applications. Maintaining disparate systems for caching, source of truth, and system of record is not a sustainable strategy as your needs grow.

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Open source web caching solution

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Content:

• JAVA’S MOST WIDELY-USED CACHE
• Unlock microsecond latency and scale with in-memory caching
• Press Room
• 10 Top Open Source Caching Tools for Linux in 2020
• Configure and use Varnish
• Velocix introduces carrier-grade open caching

JAVA’S MOST WIDELY-USED CACHE

Squid is a widely-used caching proxy server for Linux and Unix platforms. This means that it stores requested Internet objects, such as data on a Web or FTP server, on a machine that is closer to the requesting workstation than the server.

It can be set up in multiple hierarchies to assure optimal response times and low bandwidth usage, even in modes that are transparent to end users. Squid acts as a caching proxy server. It redirects object requests from clients in this case, from Web browsers to the server. When the requested objects arrive from the server, it delivers the objects to the client and keeps a copy of them in the hard disk cache.

An advantage of caching is that several clients requesting the same object can be served from the hard disk cache. This enables clients to receive the data much faster than from the Internet. This procedure also reduces the network traffic. Generating statistics about frequently-visited Web pages for the assessment of surfing habits. Squid is not a generic proxy server. It normally proxies only HTTP connections. Because Squid only supports the UDP protocol to provide communication between different caches, many multimedia programs are not supported.

As a caching proxy server, Squid can be used in several ways. When combined with a firewall, it can help with security. Multiple proxies can be used together. It can also determine what types of objects should be cached and for how long. It is possible to use Squid together with a firewall to secure internal networks from the outside. The firewall denies all clients access to external services except Squid.

All Web connections must be established by the proxy server. With this configuration, Squid completely controls Web access. If the firewall configuration includes a demilitarized zone DMZ , the proxy server should operate within this zone. Section This simplifies the configuration of the clients, because in this case, they do not need any information about the proxy server.

Several instances of Squid can be configured to exchange objects between them. This reduces the total system load and increases the chances of retrieving an object from the local network. It is also possible to configure cache hierarchies, so a cache can forward object requests to sibling caches or to a parent cache—causing it to request objects from another cache in the local network, or directly from the source.

Choosing the appropriate topology for the cache hierarchy is very important, because it is not desirable to increase the overall traffic on the network. For a very large network, it would make sense to configure a proxy server for every subnet and connect them to a parent proxy server, which in turn is connected to the caching proxy server of the ISP.

To find the most appropriate server from which to request objects, a cache sends an ICP request to all sibling proxies. The sibling proxies answer these requests via ICP responses. If multiple HIT responses were found, the proxy server decides from which server to download, depending on factors such as which cache sent the fastest answer or which one is closer.

If no satisfactory responses are received, the request is sent to the parent cache. The more objects maintained in the network, the greater the possibility of finding the desired object. Objects like these are not cached because they change each time they are accessed. To determine how long objects should remain in the cache, objects are assigned one of several states.

Other headers specifying that objects must not be cached can be used as well. Objects in the cache are normally replaced, because of a lack of free disk space, using algorithms such as LRU last recently used.

This means that the proxy expunges those objects that have not been requested for the longest time. System requirements largely depend on the maximum network load that the system must bear. Therefore, examine load peaks, as during those times, load might be more than four times the day's average. When in doubt, slightly overestimate the system's requirements. Having Squid working close to the limit of its capabilities can lead to a severe loss in quality of service. The following sections point to system factors in order of significance:.

The amount of memory RAM required by Squid directly correlates with the number of objects in the cache. Therefore, it is very important to have sufficient memory for the Squid process, because system performance is dramatically reduced if the swap disk is used.

Squid also stores cache object references and frequently requested objects in the main memory to speed up retrieval of this data. In addition to that, there is other data that Squid needs to keep in memory, such as a table with all the IP addresses handled, an exact domain name cache, the most frequently requested objects, access control lists, buffers, and more.

Squid is tuned to work best with lower processor core counts 4—8 physical cores , with each providing high performance. Technologies providing virtual cores such as hyperthreading can hurt performance. To make the best use of multiple CPU cores, it is necessary to set up multiple worker threads writing to different caching devices.

By default, multi-core support is mostly disabled. In a small cache, the probability of a HIT finding the requested object already located there is small, because the cache is easily filled and less requested objects are replaced by newer ones.

If, for example, 1 GB is available for the cache and the users use up only 10 MB per day surfing, it would take more than one hundred days to fill the cache. The easiest way to determine the necessary cache size is to consider the maximum transfer rate of the connection. 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.

Unlock microsecond latency and scale with in-memory caching

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Press Room

Apache Traffic Control allows you to build a large scale content delivery network using open source. With Apache Traffic Control, operators can set up a Content Delivery Network to quickly and efficiently deliver content to their users. Traffic Control is a highly distributed, scalable and redundant solution meeting the needs of operators from small to large. News February 4 th , - Apache Traffic Control 6. Caching content in memory and on disk reduces the load on origin servers and across bottleneck links. Reducing round trip time and increasing delivery bandwidth improves end user quality of experience. Traffic Stats acquires and stores real-time metrics and statistics into an InfluxDB for charting and alerting. February 4 th , - Apache Traffic Control 6.

10 Top Open Source Caching Tools for Linux in 2020

Cacheout A caching library for Python. Varnish Cache Varnish Cache source code repository. Joblib Computing with Python functions. Stash Stash allows you to stash text and snippets of code for reuse throughout your templates. Simple Spring Memcached A drop-in library to enable memcached caching in Spring beans via annotations.

Configure and use Varnish

Varnish Cache is, of course, the open-source reverse HTTP proxy used by millions of websites worldwide for web acceleration and content caching. This means your web service can stay fast and online even during busy periods, providing an excellent web experience to your visitors at all times. The Varnish Cache instances on Alibaba cloud are pre-configured, making it easier and faster than ever to use. High-performance, scalable internet operations. Resilience and reliability.

Velocix introduces carrier-grade open caching

What is Varnish? Benefits of Using Varnish. Varnish Compatibility with Web Applications. Default Configurations of Varnish. The Cloudways Platform offers a robust server-level caching solution as a part of our optimization stack known as Varnish.

Pqueue is a heap priority queue data structure implementation. I built an app that makes learning algorithms and data structures way more fun. Here is an example of a balanced binary tree: 5.

Squid is a caching and forwarding HTTP web proxy. It has a wide variety of uses, including speeding up a web server by caching repeated requests, caching web , DNS and other computer network lookups for a group of people sharing network resources, and aiding security by filtering traffic. Squid was originally designed to run as a daemon on Unix-like systems. A Windows port was maintained up to version 2. New versions available on Windows use the Cygwin environment. Squid was originally developed as the Harvest object cache , [9] part of the Harvest project at the University of Colorado Boulder.

What is a Squid Proxy Cache Server?. Many methods have been adopted towards achieving consecutively quicker speeds — one of them is with the help of proxy cache servers. And, among such servers, we find the Squid Proxy Cache Server. In this post, we will have a look at what a Squid Proxy Cache Server is, how it helps improve your Internet connection, as well as the other advantages that come with using it. A cache server redirects request objects from clients, made from their browsers to the serve r.

Reliable distributed computing systems and applications have become the cornerstone of prominent businesses, especially in automating and managing mission-critical business processes and delivering services to customers. As developers and system administrators of these systems and applications, you are expected to provide all kinds of information technology IT solutions that will ensure that you have the most efficient systems available. Caching is one of the many, very basic but effective application delivery techniques you can rely on.