Appearance move to sidebar hide

DeveloperIllumos Foundation
Written inC
OS familyUnix (SVR4)
Working stateCurrent
Source modelOpen source with binary blobs
Initial release2010 (2010)
Available inEnglish
PlatformsIA-32, x86-64, SPARC, ARM (under development), DEC Alpha
Kernel typeMonolithic
Preceded byOpenSolaris

Illumos (stylized as illumos) is a partly free and open-source Unix operating system. It is based on OpenSolaris, which was based on System V Release 4 (SVR4) and the Berkeley Software Distribution (BSD). Illumos comprises a kernel, device drivers, system libraries, and utility software for system administration. This core is now the base for many different open-sourced Illumos distributions, in a similar way in which the Linux kernel is used in different Linux distributions.

The maintainers write illumos in lowercase since some computer fonts do not clearly distinguish a lowercase L from an uppercase i: Il (see homoglyph). The project name is a combination of words illuminare from Latin for to light and OS for Operating System.


The OpenIndiana operating system is based on Illumos.

Illumos was announced via webinar on Thursday, 3 August 2010, as a community effort of some core Solaris engineers to create a truly open source Solaris by swapping closed source bits of OpenSolaris with open implementations.

The original plan explicitly stated that Illumos would not be a distribution or a fork. However, after Oracle announced discontinuing OpenSolaris, plans were made to fork the final version of the Solaris ON kernel allowing Illumos to evolve into a kernel of its own.

As of 2010, efforts focused on libc, the NFS lock manager, the crypto module, and many device drivers to create a Solaris-like OS with no closed, proprietary code. As of 2012, development emphasis includes transitioning from the historical compiler, Studio, to GCC. The "userland" software is now built with GNU make and contains many GNU utilities such as GNU tar.

Illumos is lightly led by founder Garrett D'Amore and other community members/developers such as Bryan Cantrill and Adam Leventhal, via a Developers' Council.

The Illumos Foundation has been incorporated in the State of California as a 501(c)6 trade association, with founding board members Jason Hoffman (formerly at Joyent), Evan Powell (Nexenta), and Garrett D'Amore. As of August 2012, the foundation was in the process of formalizing its by-laws and organizational development.

At OpenStorage Summit 2010, the new logo for Illumos was revealed, with official type and branding to follow over.


Its primary development project, illumos-gate, derives from OS/Net (aka ON), which is a Solaris kernel with the bulk of the drivers, core libraries, and basic utilities, similar to what is delivered by a BSD "src" tree. It was originally dependent on OpenSolaris OS/Net, but a fork was made after Oracle silently decided to close the development of Solaris and unofficially killed the OpenSolaris project.



Distributions, at


See also


  1. ^ "Open Brand".
  2. ^ Clulow, Joshua (25 October 2012). "Raspberry Pi Bring-Up". illumos Foundation. Archived from the original on 13 July 2017. Retrieved 14 November 2013.
  3. ^ "Building illumos". Retrieved 31 August 2023.
  4. ^ "Distributions".
  5. ^ Blankenhorn, Dana. "What Illumos is and is not". ZDNet.
  6. ^ "FAQ". illumos. Retrieved 2 May 2020.
  7. ^ Mustacchi, Robert (5 September 2015). "Linux to SmartOS cheatsheet, after smartos-discuss vetting, sans deritus. by cwvhogue - Pull Request #217". GitHub. Archived from the original on 23 May 2021. Retrieved 23 May 2021.
  8. ^ "Announcement". 15 June 2018.
  9. ^ Garrett D'Amore (3 August 2010). "illumos - Hope and Light Springs Anew - Presented by Garrett D'Amore" (PDF). Retrieved 3 August 2010.
  10. ^ "Whither OpenSolaris? illumos Takes Up the Mantle". 20 November 2012. Archived from the original on 26 September 2015.
  11. ^ Archived at Ghostarchive and the Wayback Machine: "OpenIndiana, Illumos, and the OpenSolaris Community (Part 1)". YouTube.
  12. ^ Garrett D'Amore (13 August 2010). "The Hand May Be Forced". Retrieved 14 November 2013.
  13. ^ Archived 13 May 2021 at the Wayback Machine "Oracle’s Sun Studio has been replaced with the open source GNU GCC compiler."
  14. ^ "OpenIndiana/oi-userland". GitHub. 28 October 2021.
  15. ^ Deirdré Straughan (16 May 2012). "illumos Developers' Council Meeting". Archived from the original on 10 July 2016. Retrieved 13 August 2012.
  16. ^ Garrett D'Amore (27 October 2010). "New illumos logo". Retrieved 14 November 2013.
  17. ^ "os-net-skeleton". Archived from the original on 29 July 2019. Retrieved 29 July 2019.
  18. ^ "Oracle staff report big layoffs across Solaris, SPARC teams". Retrieved 29 July 2019.
  19. ^ "OpenSolaris axed by Ellison". Retrieved 29 July 2019.
  20. ^ "illumos sporks OpenSolaris". Retrieved 29 July 2019.
  21. ^ "Distributions - illumos".
  22. ^ "DilOS". Archived from the original on 21 February 2016. Retrieved 26 February 2016.
  23. ^ "OmniOS CE". Retrieved 10 September 2017.
  24. ^ "Tribblix". Retrieved 26 February 2016.
  25. ^ "v9os". Retrieved 13 December 2017.
  26. ^ "XStreamOS". Sonicle. Retrieved 4 March 2021.
  27. ^ "OpenSXCE". Retrieved 26 February 2016.

External links