OpenRC

From Wikipedia, the free encyclopedia

Template:Short description

Page Module:Message box/ambox.css has no content.

Page Module:Infobox/styles.css has no content.

OpenRC
[[Programmer|Original authorTemplate:Pluralize from text]]Roy Marples
[[Programmer|DeveloperTemplate:Pluralize from text]]OpenRC Developers
Initial release5 April 2007; 19 years ago (2007-04-05)
Template:Infobox software/simple
Written inC,[1] sh
EnginePage Template:Plainlist/styles.css has no content.
Template:EditAtWikidata
Operating systemLinux, FreeBSD, NetBSD
Size~1.6 MB
TypeInit daemon
License2-clause BSD license
WebsiteTemplate:Official url
RepositoryPage Template:Plainlist/styles.css has no content.

Script error: No such module "Check for conflicting parameters".

OpenRC is a dependency-based init system for Unix-like computer operating systems. It was created by Roy Marples, a NetBSD developer who was also active in the Gentoo project.[2][3]

OpenRC booting Artix Linux

File:Gentoo-grub-openrc-booting--thinkpad-t430.webm

Adoption

OpenRC is the default init system or process supervisor for:

OpenRC is available as an init system or process supervisor for:

Design

OpenRC is made up of several modular components, the main ones being an init (optional), the core dependency management system, and a daemon supervisor (optional). It is written in C and POSIX-compliant shell,[1] making it usable on BSD and Linux systems.

The core part of OpenRC handles dependency management and init script parsing. OpenRC works by scanning the runlevels, building a dependency graph, then starting the needed service scripts. It exits once the scripts have been started. By default, OpenRC uses a modified version of start-stop-daemon for daemon management.[9]

Init scripts share similarities with scripts used in sysvinit, but offer several features to simplify their creation. Scripts are assumed to have start(), stop() and status(); and the system uses variables already declared to create the default functions.[10] The depend function is used to declare dependencies to other services that would be done with LSB headers in sysvinit. Configuration and mechanism are separated with configuration files in the conf.d directory and init files in the init.d directory.

openrc-init first appeared in version 0.25 as an optional replacement for /sbin/init. This can replace Gentoo Linux's default init system, sysvinit.[11]

Supervise-daemon first appeared in version 0.21 giving OpenRC supervision capabilities. It can be enabled in the init script for supervise-daemon to start and monitor a daemon. Several other daemon supervisors are supported, including runit[12] and s6.[13]

Features

  • Portable between Linux, FreeBSD, and NetBSD
  • Parallel service startup (off by default)
  • Dependency-based boot-up
  • Process segregation through cgroups[14]
  • Per-service resource limits (ulimit)
  • Separation of code and configuration (init.d / conf.d)
  • Extensible startup scripts
  • Stateful init scripts (has it started already?)
  • Complex init scripts to start multiple components (Samba [smbd and nmbd], NFS [nfsd, portmap, etc.])
  • Automatic dependency calculation and service ordering
  • Modular architecture and separation of optional components (cron, syslog)
  • Expressive and flexible network handling (including VPN, bridges, etc.)
  • Verbose debug mode
  • User services[15]

References

Page Template:Reflist/styles.css has no content.

  1. ^ a b Page Module:Citation/CS1/styles.css has no content."openrc". Analysis Summary. Ohloh. Archived from the original on 2012-11-05. Retrieved 2012-03-10.
  2. ^ Page Module:Citation/CS1/styles.css has no content."History". GitHub. Retrieved 6 April 2020.
  3. ^ Page Module:Citation/CS1/styles.css has no content."Developers". Retrieved 6 April 2020.
  4. ^ Page Module:Citation/CS1/styles.css has no content."OpenRC - Alpine Linux". wiki.alpinelinux.org. Retrieved 2025-07-21.
  5. ^ Page Module:Citation/CS1/styles.css has no content."Devuan ASCII 2.0.0 stable release". Retrieved 2021-01-18.
  6. ^ Page Module:Citation/CS1/styles.css has no content."OpenRC - ArchWiki". wiki.archlinux.org. Retrieved 2025-07-21.
  7. ^ Page Module:Citation/CS1/styles.css has no content."Adding systemd for PostmarketOS". Retrieved 2025-06-13.
  8. ^ Page Module:Citation/CS1/styles.css has no content."OpenRC - Debian Wiki". wiki.debian.org. Retrieved 2025-07-13.
  9. ^ Page Module:Citation/CS1/styles.css has no content."user guide". GitHub. Retrieved 6 April 2020.
  10. ^ Page Module:Citation/CS1/styles.css has no content."service script guide". GitHub. Retrieved 6 April 2020.
  11. ^ Page Module:Citation/CS1/styles.css has no content."OpenRC/openrc-init". February 6, 2023. Retrieved October 7, 2023.
  12. ^ Page Module:Citation/CS1/styles.css has no content."runit guide". GitHub. Retrieved 6 April 2020.
  13. ^ Page Module:Citation/CS1/styles.css has no content."s6 Guide". GitHub. Retrieved 6 April 2020.
  14. ^ Page Module:Citation/CS1/styles.css has no content."CGroups Support". Retrieved 5 April 2020.
  15. ^ Page Module:Citation/CS1/styles.css has no content."openrc/NEWS.md". GitHub.

Lua error in package.lua at line 80: module 'Module:Navbox/configuration' not found.

Retrieved from "http://cosmopedia.co/index.php?title=OpenRC&oldid=10922607"