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December 20
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The User-mode Linux Kernel Home Page
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.
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
 It's out!
It's written by me, and covers UML pretty comprehensively.
Available from the publisher and from Amazon.
- Download this kernel and this filesystem (80M, uncompressing to 1.6G)
- Uncompress them:
host% bunzip2 linux-2.6.24-rc2.bz2 FedoraCore5-x86-root_fs.bz2
- Run UML as follows:
host% chmod 755 ./linux-2.6.24-rc2
host% ./linux-2.6.24-rc2 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-rc5 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
 "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 segfault
Hang after 'VFS: Mounted root...'
For a lot more (and a lot less organized) information, see the old UML site.
This project is hosted at sourceforge.net. which provides a number of useful services:
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.
- 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:
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