Projects tagged ‘availability’

HAProxy is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited for web applications under ... [More] very high loads while needing persistence or Layer7 processing. [Less]

A collection of Wordpress plugins that enable a Wordpress based website to be used for rental property management, promotion and bookings. The plugins are not property specific so can also be used ... [More] to manage and promote any time and date based resource. [Less]

Use ping to check availability of host, and save current state to log file.

THIS PROJECT IS PRE-ALPHAIt is not ready for testing yet.We just switched to github and we have decided to use a DHT instead of a meshWhat is ErlFS?ErlFS is a system to store files in a highly ... [More] redundant and highly available way across multiple machines. ErlFS scales linearly. How does ErlFS work?GeneralErlFS uses distributed Erlang and the chord DHT algorithm. The more nodes you add to the cluster, the more capacity, throughput and redundancy you get. ErlFS is a write-once read-many system. StorageWhen a file is put into the system, it is split up into chunks and each of those chunks are redundantly copied to the next log(N) nodes' file systems. The meta-data includes the keys to each of the chunks for each particular file, content-type and other common attributes. RetrievalWhen a file is retrieved, the client retrieves the meta-data from any node, potentially behind a load-balancer, and uses the list of all the nodes for all of the chunks of a file to retrieve each chunk and joins all of them together to recompose the file, resulting in higher throughput under high load. [Less]

Syster is a software system designed to continuously monitor and record the response times of various subsystems of a UNIX or Linux installation, and to create system availability reports.

The purpose of this project is building a set of web services designed for large scale distributed systems (for example Grid or P2P systems). These services will be arhitectured on existing solutions ... [More] based on OGSA (for example Globus) and will ensure safety, security, availability and performance to the system. The development process will be based on necessary components like: monitoring, planning, data management (data replication), security and tolerance. The web service building will take in consider the following steps: - identification of the minimum set of services - description of each service and of communication modules - development of identified services - services tests - services validation (comparing with existing solutions like gLite). [Less]

portal dedicated to the thought of 'can you be there'. the idea is

A web application that notifies its users when the course they want to take becomes available. Currently, the application works only for scheduling classes at Penn State University--University Park ... [More] campus. The web application will be written in Python and developed on Google App Engine. [Less]

Welcome to UpRight UpRight is an infrastructure and library for building high-availability distributed systems. It can automatically replicate the application server for fault tolerance. As shown ... [More] in the following figure, UpRight consists of 1) the UpRight Core, which is a replication engine and 2) the client and server libraries, which connect the application with the UpRight service. There is a clear interface between the server library and the application server. The application only needs to implement a set of interface functions to be incorporated into the UpRight infrastructure. This requires only a small modification to the existing code. The application can choose different kinds of replication engines as the UpRight Core. Currently, we have provided a replication engine based on the Byzantine Fault Tolerant (BFT) protocol. In the future, we may also consider replication engine based on Paxos protocol, etc. The BFT replication engine provides the following features: High Availability: the system can tolerate both Byzantine Faults and Crash Faults. High Performance: the performance of the UpRight version of the system is close to the unreplicated version. Strong Consistency and Linearizability: the library automatically provides strong consistency and linearizability for the application. During execution, the application client sends its requests through the client library and these requests are ordered by the UpRight Core. The application servers handle these ordered requests and send replies back to the clients. The BFT replication engine can guarantee that even if a given number of nodes are down, faulty or even malicious, the whole system can still work correctly. We have provided demos of UpRight version of the Hadoop Distributed File System (HDFS) and Zookeeper coordination and lock service. In HDFS-UpRight, the namenode is replicated so that there is no single failure point in the whole system. If Zookeeper-UpRight, we replaced the original Paxos-like consensus protocol with our BFT protocol, so that it can tolerate Byzantine failures. Notice: Most of the following instructions are based on the BFT UpRight Core. Switching to other replication engine may require different configuration, but should not require modification to the application code. UpRightInstallation Guide Write a distributed program with UpRight Example Configuration and Execution The paper "UpRight Cluster Services" Advanced Topics FAQ HDFS-UpRightGetting Started Performance Demo Zookeeper-UpRightGetting Started Performance Notice: UpRight library are beta release. You're welcome to try and use it. HDFS-UpRight and Zookeeper-UpRight are demo versions, NOT ready for real deployment. [Less]

This project contains the full code for all the clearskys property management wordpress plugins. These plugins add property, booking and enquiry management functionality to your wordpress based ... [More] website. As there is a lot of cross-over functionality and inter-plugin dependancy amongst our property management plugins, the full code base can be found here. If you only need specific functionality (such as the contact form, or availability calendar) please follow instructions on the main website [Less]