Civil Rights
Movements, leaders, victories and the continuing fight for equality.
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Explore the people, places, events, achievements, struggles and stories that shaped our journey.
Movements, leaders, victories and the continuing fight for equality.
Innovation, patents, science, technology and world-changing contributions.
Pioneers, champions, Negro Leagues, records, activism and excellence.
Meet the people whose lives, choices and achievements shaped the journey.
Black towns, communities, institutions and places where history happened.
Moments that changed communities, movements, institutions and the nation.
In August 1908, a white mob attacked Springfield, Illinois’s Black community, destroying homes and businesses and lynching two Black men. National outrage over the violence helped spur the movement that created the NAACP the following year.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
| collectd | |
|---|---|
 | |
| Original author | Florian Forster |
| Release | July 8, 2005 |
| Stable release | 5.12.0[1] 
/ 3 September 2020 |
| Written in | C |
| Operating system | Any Unix-like |
| Available in | English |
| Type | Capacity planning |
| License | MIT License & GNU General Public License, version 2 |
| Website | collectd |
| Repository | |
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.[2] 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.[3]
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 the form of shared objects.[4] This way code specific to one operating system is mostly kept out of the actual daemon. Plug-ins may have their own dependencies, for example a specific operating system or software libraries. Other tasks performed by the plug-ins include processing of “notifications” and log messages.
Data acquisition plug-ins, called "read plug-ins" in collectd's documentation, can be roughly put into three categories:
So called "write plug-ins" offer the possibility to store the collected data on disk using RRD- or CSV-files, or to send data over the network to a remote instance of the daemon.
Included in the source code distribution of collectd is the so-called "network" plug-in, which can be used to send and receive data to/from other instances of the daemon. In a typical networked setup the daemon would run on each monitored host (called "clients") with the network plug-in configured to send collected data to one or more network addresses. On one or more so called "servers" the same daemon would run but with a different configuration, so that the network plug-in receives data instead of sending it. Often the RRDtool-plug-in is used on servers to store the performance data.[5]
The plug-in uses a binary network protocol over UDP. Both, IPv4 and IPv6 are supported as network layer. It is possible to use unicast (point-to-point) and multicast (point-to-group) addressing. Authentication and encryption has been added to the protocol with version 4.7.0, released in May 2009.
Source: Wikipedia. Article content is retrieved live through the MediaWiki API.
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.
LYME and LYCE are software stacks composed entirely of free and open-source software to build high-availability heavy duty dynamic web pages. The stacks are composed of: Linux, the operating system; Yaws, the web server; Mnesia or CouchDB, the database; Erlang, the functional programming language. The LYME and LYCE bundles can be and are combined with many other free and open-source software packages such as e.g. netsniff-ng for security testing and hardening, Snort, an intrusion detection (IDS) and intrusion prevention system (IPS), RRDtool for diagrams, or Nagios, Collectd, or Cacti, for monitoring.
Graphite is an open-source monitoring tool that stores numeric time series data and renders graphs on demand. It was developed at Orbitz Worldwide by Chris Davis and released as open-source software in 2008. Graphite does not collect metrics itself; it receives data pushed from collection agents such as collectd, StatsD, or Telegraf, stores it in its Whisper database, and provides a web-based API for querying and rendering graphs. Graphite is used in production by companies including Ford Motor Company, Booking.com, GitHub, Etsy, The Washington Post, and Electronic Arts. It influenced the design of later monitoring systems; Grafana was originally built as a dashboard frontend for Graphite, and Prometheus adopted a similar metrics naming convention.
RRDtool (round-robin database tool) is a data logging and graphing system for time series data such as network bandwidth, temperatures, and 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, including Perl, Python, Ruby, Tcl, PHP and Lua. There is an independent full Java implementation called rrd4j.
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →Mae Jemison, aboard Space Shuttle Endeavour in 1992.
