|
Process Supervision
Process supervision is a form of operating system service management in which some master process remains the parent of the service processes. Benefits Benefits compared to traditional process launchers and system boot mechanisms, like System V init, include: * Ability to restart services which have failed * The fact that it does not require the use of "pidfiles" * Clean process state * Reliable logging, because the master process can capture the stdout/stderr of the service process and route it to a log * Faster (concurrent) and ability to start up and stop Implementations * daemontools daemontools-encore Derived from the public-domain release of daemontools Eye A Ruby implementation Finit Fast, Extensible Init for Linux Systems God A Ruby implementation immortal A Go implementation * PM2: A Process Manager for Node.js * Initng * launchd minit A small, yet feature-complete Linux init * Monit * runit Supervisor A Python implementation s6 Low-level process and service superv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Operating System Service Management
In computing, mechanisms and techniques for managing services often differ by operating system. Examples of operating system service management are: * Service Control Manager - Used by Microsoft Windows * launchd - Used by Apple macOS * systemd - Used by many Linux distributions * Upstart - Used by Google ChromeOS * Service Management Facility - Used by illumos distributions and Oracle Solaris Android init- Used by Google Android * sysvinit - Used by older Unix-like operating systems * rc.d or rcorder-based init - Used by BSD operating systems cygserver- Used by Cygwin * runit - Used by Void * OpenRC - Used by Gentoo * The GNU Shepherd - Used by the Guix System Distribution and GNU Hurd GNU Hurd is a collection of microkernel servers written as part of GNU, for the GNU Mach microkernel. It has been under development since 1990 by the GNU Project of the Free Software Foundation, designed as a replacement for the Unix kernel, and ... but designed to work on every POS ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Init
In Unix-based computer operating systems, init (short for ''initialization'') is the first process started during booting of the computer system. Init is a daemon process that continues running until the system is shut down. It is the direct or indirect ancestor of all other processes and automatically adopts all orphaned processes. Init is started by the kernel during the booting process; a kernel panic will occur if the kernel is unable to start it. Init is typically assigned process identifier 1. In Unix systems such as System III and System V, the design of init has diverged from the functionality provided by the init in Research Unix and its BSD derivatives. Up until recently, most Linux distributions employed a traditional init that was somewhat compatible with System V, while some distributions such as Slackware use BSD-style startup scripts, and others such as Gentoo have their own customized versions. Since then, several additional init implementat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daemontools
daemontools is a process supervision toolkit written by Daniel J. Bernstein as an alternative to other system initialization and process supervision tools, such as Init In Unix-based computer operating systems, init (short for ''initialization'') is the first process started during booting of the computer system. Init is a daemon process that continues running until the system is shut down. It is the direc .... Some of the features of daemontools are: * Easy service installation and removal * Easy first-time service startup * Reliable restarts * Easy, reliable signalling * Clean process state * Portability Similar applications are runit, s6, and daemontools-encore. References External links maintained by the author Public-domain software with source code Unix process- and task-management-related software {{Unix-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PM2 (software)
PM2 is a process manager for the JavaScript runtime Node.js. In 2016, PM2 was ranked as th82nd most popularJavaScript project on GitHub. Overview PM2 or Process Manager 2, is an Open Source, production ready Node.js process manager. Some key features of PM2 are automatic application load balancing, declarative application configuration, deployment system and monitoring. Started in 2013 by Alexandre Strzelewicz. The code source is hosted on GitHub GitHub, Inc. () is an Internet hosting service for software development and version control using Git. It provides the distributed version control of Git plus access control, bug tracking, software feature requests, task management, continu ... and installable via npm. References Further reading * * External links * {{JavaScript JavaScript programming tools 2013 software ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Node
In general, a node is a localized swelling (a "knot") or a point of intersection (a vertex). Node may refer to: In mathematics * Vertex (graph theory), a vertex in a mathematical graph *Vertex (geometry), a point where two or more curves, lines, or edges meet. * Node (autonomous system), behaviour for an ordinary differential equation near a critical point *Singular point of an algebraic variety, a type of singular point of a curve In science and engineering Astronomy *Orbital node, the points where an orbit crosses a plane of reference ** Lunar node, where the orbits of the sun and moon intersect ** Longitude of the ascending node, how orbital nodes are parameterized Biology * Lymph node, an immune system organ used to store white blood cells *Node of Ranvier, periodic gaps in the insulating myelin sheaths of myelinated axons *Sinoatrial node and atrioventricular node, specialized tissues in the heart responsible for initiating and coordinating the heartbeat * Primitive kno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Initng
Initng is a full replacement of the UNIX System V init, the first process spawned by the kernel in Unix-like computer operating systems, which is responsible for the initialization of every other process. Initng's website calls initng "The next generation init system". Purpose Many implementations of init (including Sysvinit used in many Linux distributions) start processes in a pre-determined order, and only start a process once the previous process finishes its initialization. Initng starts a process as soon as all of its dependencies are met. It can start several processes in parallel. Initng is designed to significantly increase the speed of booting a Unix-compatible system by starting processes asynchronously. Initng's supporters claim that it also gives the user more statistics and control over the system. Development Despite being still considered beta, it was chosen as the default init system for Pingwinek, Enlisy, Berry Linux and Bee. Also there are packages for many ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Launchd
launchd is an init and operating system service management daemon created by Apple Inc. as part of macOS to replace its BSD-style init and SystemStarter. There have been efforts to port launchd to FreeBSD and derived systems. Components There are two main programs in the launchd system: launchd and launchctl. ''launchd'' manages the daemons at both a system and user level. Similar to xinetd, launchd can start daemons on demand. Similar to watchdogd, launchd can monitor daemons to make sure that they keep running. launchd also has replaced init as PID 1 on macOS and as a result it is responsible for starting the system at boot time. Configuration files define the parameters of services run by launchd. Stored in the LaunchAgents and LaunchDaemons subdirectories of the Library folders, the property list-based files have approximately thirty different keys that can be set. launchd itself has no knowledge of these configuration files or any ability to read them - that is th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monit
Monit is a free, open-source process supervision tool for Unix and Linux. With Monit, system status can be viewed directly from the command line, or via the native HTTP(S) web server. Monit is able to do automatic maintenance, repair, and run meaningful causal actions in error situations. Monit rose to popularity with Ruby on Rails and the Mongrel web server, because a tool was needed that could manage the many identical Mongrel processes that needed to be run to support a scalable Ruby on Rails site, and Monit was fairly uniquely suited for the needs of the Ruby on Rails community. Many popular Rails sites have used Monit, including Twitter and scribd. Monit can restart a process automatically if process dies or monitor process characteristics, such as memory or cpu cycles and alert by email or execute and action. Additionally M/Monit can monitor and manage distributed computer systems, M/Monit uses Monit as an agent and can manage and monitor. M/Monit is licensed software. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Runit
runit is an init and service management scheme for Unix-like operating systems that initializes, supervises, and ends processes throughout the operating system. Runit is a reimplementation of the daemontools process supervision toolkit that runs on many Linux-based operating systems, as well as BSD, and Solaris operating systems. Runit features parallelization of the start up of system services, which can speed up the boot time of the operating system. When running as an init daemon, Runit is the direct or indirect ancestor of all other processes. It is the first process started during booting, and continues running until the system is shut down. It is often used with other init systems as a separate service manager. In the service manager role, it can be used by unprivileged users to orchestrate personal services, as well as by root to manage services not otherwise managed by the init system currently in use. Design Runit focuses on being a small, modular, and portable code ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Systemd
systemd is a software suite that provides an array of system components for Linux operating systems. Its main aim is to unify service configuration and behavior across Linux distributions; Its primary component is a "system and service manager"—an init system used to bootstrap user space and manage user processes. It also provides replacements for various daemons and utilities, including device management, login management, network connection management, and event logging. The name ''systemd'' adheres to the Unix convention of naming daemons by appending the letter ''d''. It also plays on the term " System D", which refers to a person's ability to adapt quickly and improvise to solve problems. Since 2015, the majority of Linux distributions have adopted systemd, having replaced other init systems such as SysV init. It has been praised by developers and users of distributions that adopted it for providing a stable, fast out-of-the-box solution for issues that had exist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
