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资源说明：Decentralized HTTP content delivery network (CDN) coded in PHP
# oversky Decentralized HTTP content delivery network (CDN) coded in PHP ## Description oversky is a decentralized HTTP content delivery network implemented in PHP. It is based on a distributed hash table (DHT) and, being fully implemented on top of HTTP, its use is transparent to any HTTP client. It can be used to provide load balancing, geographic redundancy, distributed caching or even as an integration to the DNS system. ## Current status This is currently pre-alpha software. All specifications may still be subject to change. Do not use in production environments! Please note that even if it is designed to be as generic and compatible as possible, it's still under heavy development and has not been fully tested. oversky is being developed on Linux x64, Apache 2, PHP 5.2, MySQL 5.1: compatibility with other systems/softwares has not been tested. All files of the oversky repository are covered by the GPLv3 license. ## Installation To run oversky you'll need: * a working Apache installation * PHP 5 (with the mcrypt and PDO modules) * a working databse with the relative PDO driver The first step is to configure your oversky instance: open the `oversky.configuration.phpi.template` file and fill in all the settings (see the comments in that file for instructions). Save the modified file as `oversky.configuration.phpi`. When done, request `oversky.php?action=setup` from your browser. This performs a few sanity checks and sets up the working directories and database. If no error is reported and you're redirected to the welcome page you should have a working oversky instance. ## Bootstrapping Once you have a working instance, you need to connect it to the oversky DHT. Until autodiscovery is implemented, you'll need to manually find another instance that is already connected to the oversky DHT. Then, by requesting `oversky.php?action=hostdiscovery&host=` that instance will be added to the known hosts list. ## Registering files To add a static HTTP resource to the DHT, request `oversky.php?action=register&location= `. A copy of the or resource identified by the URL will be created in the working private directory, and the file will be uniquely identified by the SHA-256 hash of its contents. ## Geting files To get a file you can request `oversky.php?action=get&key= ` on any instance of the oversky DHT: the network will look for a node with a copy of the resource and seamlessly redirect your browser to that resource.
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