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The User-mode Linux Kernel Home Page
Run Linux inside itself
User-Mode Linux is a safe, secure way of running Linux versions and Linux processes. Run buggy software, experiment with new Linux kernels or distributions, and poke around in the internals of Linux, all without risking your main Linux setup.
User-Mode Linux gives you a virtual machine that may have more hardware and software virtual resources than your actual, physical computer. Disk storage for the virtual machine is entirely contained inside a single file on your physical machine. You can assign your virtual machine only the hardware access you want it to have. With properly limited access, nothing you do on the virtual machine can change or damage your real computer, or its software.
Applications
Here are some of the things that UML is used for:
Hosting of virtual servers Kernel development Experimenting with new kernels and distributions Education Sandbox
The UML Book
It's out!
It's written by me, and covers UML pretty comprehensively.
Available from the publisher and from Amazon.
Getting started
Download this kernel (or this one for 64-bit systems) and this filesystem (80M, uncompressing to 1.6G) (or this 64-bit filesystem) Uncompress them:
host% bunzip2 linux-2.6.24-rc7.bz2 FedoraCore5-x86-root_fs.bz2
Run UML as follows:
host% chmod 755 ./linux-2.6.24-rc7
host% ./linux-2.6.24-rc7 ubda=FedoraCore5-x86-root_fs mem=128M
Boot log Log in as root, no password needed:
Fedora Core release 5 (Bordeaux)
Kernel 2.6.19-rc7 on an i686
localhost login: root
[root@localhost ~]#
Explore! When you're done, shut it down:
[root@localhost ~]# halt
Broadcast message from root (tty0) (Tue Apr 4 17:18:01 2006):
The system is going down for system halt NOW!
INIT: Switching to runlevel: 0
INIT: Sending processes the TERM signal
Shutdown log![[image]](http://mowser.com/img?url=http%3A%2F%2Fuser-mode-linux.sourceforge.net%2Fcry.png)
"Panic - Failed to open 'root_fs', errno = 2""F_SETLK failed, file already locked by pid n"UML exits after a few lines of output"Kernel panic - not syncing: Kernel mode signal 7""handle_trap - failed to wait at end of syscall"On x86_64, processes randomly segfaultHang after 'VFS: Mounted root...'Where to go from here
Put your UML on the network Build from source Configure your UML virtual machine Access host files Kernel hacking with gdb
For a lot more (and a lot less organized) information, see the old UML site.
Resources
This project is hosted at sourceforge.net. which provides a number of useful services:
This web site is hosted at SourceForge Mailing lists
Searchable list archives exist at MARC (uml-user, uml-devel) and gmane (uml-user, uml-devel). IRC (see www.irchelp.org/ for more information on IRC) - #uml on irc.oftc.net is where I hang out 2-3 days a week. It's good for general UML questions and chit-chat. #kernelnewbies on oftc.net is a also good place for UML questions and discussion that relate to kernel development in general.
user-mode-linux-devel - for discussion of the innards, code, algorithms, etc. user-mode-linux-user - for discussion of the outards, questions about running the kernel, configuring it, etc.
Bug reports may be sent to either list.Searchable list archives exist at MARC (uml-user, uml-devel) and gmane (uml-user, uml-devel). IRC (see www.irchelp.org/ for more information on IRC) - #uml on irc.oftc.net is where I hang out 2-3 days a week. It's good for general UML questions and chit-chat. #kernelnewbies on oftc.net is a also good place for UML questions and discussion that relate to kernel development in general.
Related Projects
http://clownix.net : A network simualation tool for UML - contains its own virtual switch
http://vde.sourceforge.net/ : Virtual Distributed Ethernet - layers a virtual ethernet over IP
http://www.dit.upm.es/vnumlwiki/index.php/Main_Page : Virtual Network User-Mode-Linux over IP
Robert P. J. Day's UML on Fedora Wiki
http://vde.sourceforge.net/ : Virtual Distributed Ethernet - layers a virtual ethernet over IP
http://www.dit.upm.es/vnumlwiki/index.php/Main_Page : Virtual Network User-Mode-Linux over IP
Robert P. J. Day's UML on Fedora Wiki
Thanks
Dartmouth ISTS and Bill Stearns for sponsoring the security work in UML Bill Stearns for many forms of support since nearly the start of the UML project. HP contributed a nice IA64 workstation to the UML project. Intel for hiring me in 2004 to work on UML full-time Donations from:
Support Open Source - SEO Company encourages firms on the Internet to support the open source community. Go4Expert - Programming and Web Development Forum - Supporting Open Source projects Filippo Cortigiani The Online Literature Library at couol.com NET-TEC Internetmarketing Celebrity posters Hitflip Dewitts Media Website Design Foss Tools John Dykstra netzwelt
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