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RRDTool
RRDtool (''round-robin database tool'') aims to handle time series data such as network bandwidth, temperatures or CPU load. The data is stored in a circular buffer based database, thus the system storage footprint remains constant over time. It also includes tools to extract round-robin data in a graphical format, for which it was originally intended. Bindings exist for several programming languages, e.g. Perl, Python, Ruby, Tcl, PHP and Lua. There is an independent full Java implementation called rrd4j. General data storage RRDtool assumes time-variable data in intervals of a certain length. This interval, usually named step, is specified upon creation of an RRD file and cannot be changed afterwards. Because data may not always be available at just the right time, RRDtool will automatically interpolate any submitted data to fit its internal time-steps. The value for a specific step, that has been interpolated, is named a primary data point (PDP). Multiple PDPs may be con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cacti (software)
Cacti is an open-source, web-based network monitoring and graphing tool designed as a front-end application for the open-source, industry-standard data logging tool RRDtool. Cacti allows a user to poll services at predetermined intervals and graph the resulting data. It is generally used to graph time-series data of metrics such as CPU load and network bandwidth utilization. A common usage is to monitor network traffic by polling a network switch or router interface via Simple Network Management Protocol (SNMP). The front end can handle multiple users, each with their own graph sets, so it is sometimes used by web hosting providers (especially dedicated server, virtual private server, and colocation providers) to display bandwidth statistics for their customers. It can be used to configure the data collection itself, allowing certain setups to be monitored without any manual configuration of RRDtool. Cacti can be extended to monitor any source via shell scripts and executab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Multi Router Traffic Grapher
The Multi Router Traffic Grapher (MRTG) is free software for monitoring and measuring the traffic load on network links. It allows the user to see traffic load on a network over time in graphical form. It was originally developed by Tobias Oetiker and Dave Rand to monitor router traffic, but has developed into a tool that can create graphs and statistics for almost anything. MRTG is written in Perl and can run on Windows, Linux, Unix, Mac OS and NetWare. How it works SNMP MRTG uses the Simple Network Management Protocol (SNMP) to send requests with two object identifiers (OIDs) to a device. The device, which must be SNMP-enabled, will have a management information base (MIB) to look up the OIDs specified. After collecting the information it will send back the raw data encapsulated in an SNMP protocol. MRTG records this data in a log on the client along with previously recorded data for the device. The software then creates an HTML document from the logs, containing a list of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MRTG
The Multi Router Traffic Grapher (MRTG) is free software for monitoring and measuring the traffic load on network links. It allows the user to see traffic load on a network over time in graphical form. It was originally developed by Tobias Oetiker and Dave Rand to monitor router traffic, but has developed into a tool that can create graphs and statistics for almost anything. MRTG is written in Perl and can run on Windows, Linux, Unix, Mac OS and NetWare. How it works SNMP MRTG uses the Simple Network Management Protocol (SNMP) to send requests with two object identifiers (OIDs) to a device. The device, which must be SNMP-enabled, will have a management information base (MIB) to look up the OIDs specified. After collecting the information it will send back the raw data encapsulated in an SNMP protocol. MRTG records this data in a log on the client along with previously recorded data for the device. The software then creates an HTML document from the logs, containing a list ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Munin (software)
Munin is a free and open-source computer system monitoring, network monitoring and infrastructure monitoring software application. Munin is written in Perl and uses RRDtool to create graphs, which are accessible over a web interface. Its emphasis is on plug and play capabilities. About 500 monitoring plugins are currently available. It is intended to make it easy to determine "what's different today" when a performance problem happens and to provide visibility into capacity and utilization of resources. History Munin was started by Jimmy Olsen late 2003, based on RRDtool by Tobi Oetiker. Development has slowed since 2005, but Munin is a stable tool and is still maintained. “Its name is derived from Norse mythology. One of the two ravens who report the news of the world to the god Odin is called Munin, and the other is named Hugin. Munin is 'memory', and Hugin is 'thought'.” Architecture Plugins Plugins are the specialized programs that are called by Munin nodes to ga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monitorix
Monitorix is a computer network monitoring tool that periodically collects system data and uses the web interface to show the information as graphs. Monitorix allows monitoring of overall system performance, and can help detect bottlenecks, failures, unusually long response times and other anomalies. One part of the tool is a collector, called ''monitorix.'' This Perl daemon is started automatically like any other system service. The second program of Monitorix is a CGI script (''monitorix.cgi).'' Since version 3.0 Monitorix has its own HTTP server included, what makes installing an own web server unnecessary. Monitorix is free software licensed under the terms of the GNU General Public License version 2 (GPLv2) as published by the Free Software Foundation. It uses the RRDtool (written by Tobi Oetiker) and is written in Perl. See also * RRDtool * Collectd * Munin * Comparison of network monitoring systems The following tables compare general and technical informati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Collectd
collectd is a Unix daemon that collects, transfers and stores performance data of computers and network equipment. The acquired data is meant to help system administrators maintain an overview over available resources to detect existing or looming bottlenecks. The first version of the daemon was written in 2005 by Florian Forster and has been further developed as free open-source project. Other developers have written improvements and extensions to the software that have been incorporated into the project. Most files of the source code are licensed under the terms of the GNU General Public License, version 2 (GPLv2), the remaining files are licensed under other open source licenses. Operation ''collectd'' uses a modular design: The daemon itself only implements infrastructure for filtering and relaying data as well as auxiliary functions and requires very few resources, it even runs on OpenWrt-powered embedded devices. Data acquisition and storage is handled by plug-ins in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nagios
Nagios Core , formerly known as Nagios, is a free and open-source computer-software application that monitors systems, networks and infrastructure. Nagios offers monitoring and alerting services for servers, switches, applications and services. It alerts users when things go wrong and alerts them a second time when the problem has been resolved. Ethan Galstad and a group of developers originally wrote Nagios as ''NetSaint''. they actively maintain both the official and unofficial plugins. Nagios is a recursive acronym: "Nagios Ain't Gonna Insist On Sainthood" – "sainthood" makes reference to the original name ''NetSaint'', which changed in response to a legal challenge by owners of a similar trademark. " Agios" (or "hagios") also transliterates the Greek word ''άγιος'', which means "saint". Nagios was originally designed to run under Linux, but it also runs on other Unix variants. It is free software licensed under the terms of the GNU General Public License versio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lighttpd
lighttpd (pronounced "lighty") is an open-source web server optimized for speed-critical environments while remaining standards-compliant, secure and flexible. It was originally written by Jan Kneschke as a proof-of-concept of the c10k problem – how to handle 10,000 connections in parallel on one server, but has gained worldwide popularity. Its name is a portmanteau of "light" and ". Premise The low memory footprint (compared to other web servers), small central processing unit, CPU load and speed optimizations make lighttpd suitable for servers that are suffering load problems, or for serving static media separately from dynamic content. lighttpd is free and open-source software and is distributed under the BSD license. It runs natively on Unix-like operating systems, as well as Microsoft Windows. Application support lighttpd supports the FastCGI, SCGI and CGI interfaces to external programs, allowing web applications written in any programming language to be used with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ganglia (software)
Ganglia is a scalable, distributed monitoring tool for high-performance computing systems, clusters and networks. The software is used to view either live or recorded statistics covering metrics such as CPU load averages or network utilization for many nodes. Ganglia software is bundled with enterprise-level Linux distributions such as Red Hat Enterprise Level (RHEL) or the CentOS repackaging of the same. Ganglia grew out of requirements for monitoring systems by Berkeley (University of California) but now sees use by commercial and educational organisations such as Cray, MIT, NASA and Twitter. Ganglia It is based on a hierarchical design targeted at federations of clusters. It relies on a multicast-based listen/announce protocol to monitor state within clusters and uses a tree of point-to-point connections amongst representative cluster nodes to federate clusters and aggregate their state. It leverages widely used technologies such as XML for data representation, XDR for com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cherokee (Webserver)
Cherokee is an open-source cross-platform web server that runs on Linux, BSD variants, Solaris, , and Windows. It is a lightweight, high-performance web server/reverse proxy licensed under the GNU General Public License. Its goal is to be fast and fully functional yet still light. Major features of Cherokee include a graphical administration interface named ''cherokee-admin'', and a modular light-weight design. Independent tests have shown Cherokee to be better performing than Apache when serving up both static and dynamic content. Cherokee is maintained and developed by an open source community. Features Web server features * TLS and SSL * Virtual servers * URL rewriting and redirections supporting regular expressions * Authentication via htdigest, htpasswd, LDAP, MySQL, PAM, plain, and fixed list. * Reverse HTTP proxy * HTTP load balancing * Traffic shaping * Custom and Apache compatible log format. * Ability to launch web applications on demand * Audio/vid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grid Computing
Grid computing is the use of widely distributed computer resources to reach a common goal. A computing grid can be thought of as a distributed system with non-interactive workloads that involve many files. Grid computing is distinguished from conventional high-performance computing systems such as cluster computing in that grid computers have each node set to perform a different task/application. Grid computers also tend to be more heterogeneous and geographically dispersed (thus not physically coupled) than cluster computers. Although a single grid can be dedicated to a particular application, commonly a grid is used for a variety of purposes. Grids are often constructed with general-purpose grid middleware software libraries. Grid sizes can be quite large. Grids are a form of distributed computing composed of many networked loosely coupled computers acting together to perform large tasks. For certain applications, distributed or grid computing can be seen as a special type o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
