Knoppix 6.0.1 with LXDE |
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| Company / developer | Klaus Knopper |
| OS family | Unix-like |
| Working state | Current |
| Source model | Free and open source software |
| Latest stable release | 6.7.1 / September 16, 2011[1] |
| Available language(s) | German and English |
| Update method | APT (front-ends available) |
| Package manager | dpkg |
| Kernel type | Monolithic Linux kernel |
| Default user interface | LXDE (previously KDE) |
| License | Various, mostly GNU GPL[2] |
| Official website | www.knoppix.org |
Knoppix, or KNOPPIX ( /kᵊˈnɒpɪks/ k-nop-iks),[3] is an operating system based on Debian designed to be run directly from a CD / DVD (Live CD) or a USB key (Live USB), one of the first of its kind for any operating system. Knoppix was developed by Linux consultant Klaus Knopper. When starting a program, it is loaded from the removable medium and decompressed into a RAM drive. The decompression is transparent and on-the-fly.
Although Knoppix is primarily designed to be used as a Live CD, it can also be installed on a hard disk like a typical operating system. Computers that support booting from USB devices can load Knoppix from a live USB flash drive or memory card.
There are two main editions of Knoppix: the traditional Compact Disc (700 megabytes) edition and the DVD (4.7 gigabytes) "Maxi" edition. Each of these main editions have two language-specific editions: English and German.
Knoppix mostly consists of free and open source software, but also includes proprietary software.[4]
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Knoppix can be used to copy files easily from hard drives with inaccessible operating systems. To quickly and more safely use Linux software, the Live CD can be used instead of installing another OS.
More than 1000 software packages are included on the CD edition and more than 2600 are included on the DVD edition. Up to 9 gigabytes can be stored on the DVD in compressed form. These packages include:
Prior to Knoppix 3.8.2, any documents or settings a user created would disappear upon reboot. This lack of permanence made it necessary to save documents explicitly to a hard drive partition, over the network, or to some removable medium, such as a USB flash drive.
It was also possible to set up a "persistent home directory", where any documents or settings written to the user's home directory would automatically be redirected to a hard drive or removable medium, which could be automatically mounted on bootup. What is stored there physically is a file called knoppix.img. The file is used to simulate a file system into which files are written for later use. This is transparent for the user. What the user perceives is that it is possible to write files to the home directory.
Union mount support was added in version 3.8.1 through UnionFS. This was later replaced in 5.1.0 by Aufs to improve stability.[5] The union mount allows virtual updates to the data on the read-only CD/DVD medium by storing changes on a separate writable medium and then representing the combination of the two as single storage device. The writable medium can be memory (ramdisk), a hard disk, USB flash drive, etc. This means that the user can modify the software installed on the Knoppix system, such as by using APT to install or update software. The storage device containing the changes needs to be present whenever Knoppix is started else only the original data from the disc will be used.
By default Knoppix will scan available storage devices for a persistent home directory, but you can override this scan and provide a specific location with a boot option (see below) such as:
home=/dev/hda1/knoppix.img [6]
By carrying a Knoppix CD and a USB flash drive, a user can have the same environment, programs, settings, and data available on any computer that is Knoppix-compatible.
When using Knoppix as a Live CD, one can use boot options, also known as 'cheatcodes', to override a default setting or automatic hardware detection when it fails. For example, the user may wish to boot into a plain console, or proceed without SCSI support. For this, Knoppix allows the user to enter one or more cheat codes at the prompt before booting. If the user does not enter a cheat code, or does not press any key before the timeout, Knoppix will boot with its default options. For example, to set the language to French rather than the default, one would type:
knoppix lang=fr[6]
Knoppix was one of the first Live CD Linux distributions to gain popularity.[7] There are several factors that contribute to the popularity of Knoppix:
Knoppix works on a fairly large number of PCs or laptops, but not all. The automatic hardware detection cannot cope with all hardware, and sometimes the drivers used will not be optimal. Knoppix has difficulty recognizing some cards made before 1998, or motherboards with a BIOS made before 2002. (In some cases, manual configuration with codes entered at boot time can overcome problems with automatic detection.)
If a PC does not have enough RAM to run KDE and other included programs, Knoppix boots up a very limited twm session instead. The only window running in the twm session by default is xterm.
As of April 2008, from version 4 up until 5.1.1, Knoppix has been split into a DVD "maxi" edition (with over 9 GB of software), and a CD "light" edition, both developed in parallel.[8][9]
The following is the version history of major releases.
| Knoppix version | Release date | CD | DVD |
| 1.4 | 30 September 2000 | Yes | No |
| 1.6 | 26 April 2001 | Yes | No |
| 2.1 | 14 March 2002 | Yes | No |
| 2.2 | 14 May 2002 | Yes | No |
| 3.1 | 19 January 2003 | Yes | No |
| 3.2 | 26 July 2003 | Yes | No |
| 3.3 | 22 September 2003 | Yes | No |
| 3.4 | 17 May 2004 | Yes | No |
| 3.5 LinuxTag-Version | June 2004 | No | Yes |
| 3.6 | 16 August 2004 | Yes | No |
| 3.7 | 9 December 2004 | Yes | No |
| 3.8 CeBIT-Version | 28 February 2005 | Yes | No |
| 3.8.1 | 8 April 2005 | Yes | No |
| 3.8.2 | 12 May 2005 | Yes | No |
| 3.9 | 1 June 2005 | Yes | No |
| 4.0 LinuxTag-Version | 22 June 2005 | No | Yes |
| 4.0 updated | 16 August 2005 | No | Yes |
| 4.0.2 | 23 September 2005 | Yes | Yes |
| 5.0 CeBIT-Version | 25 February 2006 | No | Yes |
| 5.0.1 | 2 June 2006 | Yes | Yes |
| 5.1.0 | 30 December 2006 | Yes | Yes |
| 5.1.1 | 4 January 2007 | Yes | Yes |
| 5.2 CeBIT-Version | March 2007 | No | Yes |
| 5.3 CeBIT-Version | 12 February 2008 | No | Yes |
| 5.3.1 | 26 March 2008 | No | Yes |
| ADRIANE | |||
| 6.0.0 | 28 January 2009 | Yes | No |
| 6.0.1 | 8 February 2009 | Yes | No |
| 6.1 CeBIT-Version | 25 February 2009 | Yes | Yes |
| 6.2 / ADRIANE 1.2 | 18 November 2009 | Yes | Yes |
| 6.2.1 | 31 January 2010 | Yes | Yes |
| 6.3 CeBIT-Version | 2 March 2010 | No | Yes |
| 6.4.3 | 20 December 2010 | Yes | Yes |
| 6.4.4 | 1 February 2011 | Yes | Yes |
| 6.5 CeBIT-Version | March 2011 | No | Yes |
| 6.7.0 | 3 August 2011 | Yes | Yes |
| 6.7.1 | 16 September 2011 | Yes | Yes |
The KNOPPIX 6.0.1 / ADRIANE 1.1 is a CD-edition again, and a complete rebuild from scratch. LXDE as default desktop and a very reduced software collection in order to easily fit on CD.[10] No further development is being done of the traditional 5.x versions.
The KNOPPIX 6.2.1 release, both CD and DVD, and the ADRIANE 1.2 has just CD-edition.[11]
Adriane Knoppix is a variation that is intended for blind and visually impaired people, which can be used entirely without vision oriented output devices. It was released in the third quarter of 2007 as a Live CD. Adriane Knoppix is named after Adriane Knopper, the wife of Klaus Knopper, the developer of Knoppix. Adriane has a visual impairment, and has been assisting Klaus with the development of the software.[12] The name Adriane is also a backronym for "Audio Desktop Reference Implementation And Networking Environment".
Adriane Knoppix is intended not only for the blind but also for beginners who don’t know much about computers. It uses the SUSE Blinux screen reader with a phoneme generator and speech engine for normal output.
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