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<title>Running User Mode Linux</title>
</head>
<body alink="#FF0000" vlink="#55188A" link="#0000EF" bgcolor="#FFFFFF" text="#000099">
<table border="0">
<tr align="left">
<td valign="top">
<table border="0">
<tr align="left"><td valign="top" >
<img src="uml-small.png" height="171" width="120"/>
</td></tr>
<tr align="left"><td valign="top" bgcolor="#e0e0e0">
<font size="-1"><a href="index.html">Site Home Page</a></font>
<br>
<font size="-1"><a href="http://uml.harlowhill.com">The UML Wiki</a></font>
<br>
<font size="-1"><a href="http://usermodelinux.org">UML Community Site</a></font>
<br>
<font size="-1"><a href="roadmap.html">The UML roadmap</a></font>
<br>
<font size="-1"><a href="uses.html">What it's good for</a></font>
<br>
<font size="-1"><a href="case-studies.html">Case Studies</a></font>
<br>
<font size="-1"><a href="kernel.html">Kernel Capabilities</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/dl-sf.html">Downloading it</a></font>
<br>
<font size="-1"><a href="run.html">Running it</a></font>
<br>
<font size="-1"><a href="compile.html">Compiling</a></font>
<br>
<font size="-1"><a href="install.html">Installation</a></font>
<br>
<font size="-1"><a href="skas.html">Skas Mode</a></font>
<br>
<font size="-1"><a href="patches.html">Incremental Patches</a></font>
<br>
<font size="-1"><a href="tests.html">Test Suite</a></font>
<br>
<font size="-1"><a href="devanon.html">Host memory use</a></font>
<br>
<font size="-1"><a href="fs_making.html">Building filesystems</a></font>
<br>
<font size="-1"><a href="faq.html">Troubles</a></font>
<br>
<font size="-1"><a href="contrib.html">User Contributions</a></font>
<br>
<font size="-1"><a href="links.html">Related Links</a></font>
<br>
<font size="-1"><a href="todo.html">The ToDo list</a></font>
<br>
<font size="-1"><a href="projects.html">Projects</a></font>
<br>
<font size="-1"><a href="diary.html">Diary</a></font>
<br>
<font size="-1"><a href="thanks.html">Thanks</a></font>
<br>
<font size="-1"><a href="contacts.html">Contacts</a></font>
</td></tr>
<tr align="left"><td valign="top" bgcolor="#e0e0e0">Tutorials<br>
<font size="-1"><a href="UserModeLinux-HOWTO.html">The HOWTO (html)</a></font>
<br>
<font size="-1"><a href="UserModeLinux-HOWTO.txt.gz">The HOWTO (text)</a></font>
<br>
<font size="-1"><a href="hostfs.html">Host file access</a></font>
<br>
<font size="-1"><a href="input.html">Device inputs</a></font>
<br>
<font size="-1"><a href="shared_fs.html">Sharing filesystems</a></font>
<br>
<font size="-1"><a href="fs.html">Creating filesystems</a></font>
<br>
<font size="-1"><a href="resize.html">Resizing filesystems</a></font>
<br>
<font size="-1"><a href="networking.html">Virtual Networking</a></font>
<br>
<font size="-1"><a href="mconsole.html">Management Console</a></font>
<br>
<font size="-1"><a href="debugging.html">Kernel Debugging</a></font>
<br>
<font size="-1"><a href="honeypots.html">UML Honeypots</a></font>
<br>
<font size="-1"><a href="gprof.html">gprof and gcov</a></font>
<br>
<font size="-1"><a href="xtut.html">Running X</a></font>
<br>
<font size="-1"><a href="trouble.html">Diagnosing problems</a></font>
<br>
<font size="-1"><a href="config.html">Configuration</a></font>
<br>
<font size="-1"><a href="slack_readme.html">Installing Slackware</a></font>
<br>
<font size="-1"><a href="arch-port.html">Porting UML</a></font>
<br>
<font size="-1"><a href="iomem.html">IO memory emulation</a></font>
<br>
<font size="-1"><a href="2G-2G.html">UML on 2G/2G hosts</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/lksct/index.html">Adding a UML system call</a></font>
<br>
<font size="-1"><a href="nesting.html">Running nested UMLs</a></font>
</td></tr>
<tr align="left"><td valign="top" bgcolor="#e0e0e0">How you can help<br>
<font size="-1"><a href="help-gen.html">Overview</a></font>
<br>
<font size="-1"><a href="help-doc.html">Documentation</a></font>
<br>
<font size="-1"><a href="help-userspace.html">Utilities</a></font>
<br>
<font size="-1"><a href="help-kernel-v1.html">Kernel bugs</a></font>
<br>
<font size="-1"><a href="projects.html">Kernel projects</a></font>
</td></tr>
<tr align="left"><td valign="top" bgcolor="#e0e0e0">Screenshots<br>
<font size="-1"><a href="net.html">A virtual network</a></font>
<br>
<font size="-1"><a href="x.html">An X session</a></font>
</td></tr>
<tr align="left"><td valign="top" bgcolor="#e0e0e0">Transcripts<br>
<font size="-1"><a href="login.html">A login session</a></font>
<br>
<font size="-1"><a href="debug-session.html">A debugging session</a></font>
<br>
<font size="-1"><a href="slackinst.html">Slackware installation</a></font>
</td></tr>
<tr align="left"><td valign="top" bgcolor="#e0e0e0">Reference<br>
<font size="-1"><a href="switches.html">Kernel switches</a></font>
<br>
<font size="-1"><a href="slack_readme.html">Slackware README</a></font>
</td></tr>
<tr align="left"><td valign="top" bgcolor="#e0e0e0">Papers<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/als2000/index.html">ALS 2000 paper (html)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/als2000.tex">ALS 2000 paper (TeX)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/als2000/slides.html">ALS 2000 slides</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/lca2001/lca.html">LCA 2001 slides</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/ols2001/index.html">OLS 2001 paper (html)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/ols2001.tex">OLS 2001 paper (TeX)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/als2001/index.html">ALS 2001 paper (html)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/als2001.tex">ALS 2001 paper (TeX)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/ists2002/umlsec.htm">UML security (html)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/lca2002/lca2002.htm">LCA 2002 (html)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/wvu2002/wvu2002.htm">WVU 2002 (html)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/ists_rt/ists_rt.htm">Security Roundtable (html)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/ols2002/ols2002.html">OLS 2002 slides</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/lwe2005/LWE2005.html">LWE 2005 slides</a></font>
</td></tr>
<tr align="left"><td valign="top" bgcolor="#e0e0e0">Fun and Games<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/cgi-bin/hangman">Kernel Hangman</a></font>
<br>
<font size="-1"><a href="sdotm.html">Disaster of the Month</a></font>
</td></tr>
</table>
</td>
<td valign="top" align="left">
<center>
<h3>Running UML and logging in</h3>
</center>
<a name="Running UML"/><table width="100%" bgcolor="#e0e0e0">
<tr>
<td>
<b>
<font color="black">Running UML</font>
</b>
</td>
</tr>
</table>
<blockquote head="Running UML">
It runs on 2.2.15 or later, and all 2.4 and 2.6 kernels.
<p>
Booting UML is straightforward. Simply run 'linux': it will try to
mount the file `root_fs' in the current directory. You do not need to
run it as root. If your root filesystem is not named `root_fs', then
you need to put a `ubd0=root_fs_whatever' switch on the linux command
line.
<p>
You will need a filesystem to boot UML from. There are a number
available for download from <a href="dl-sf.html">here
</a>. There are also <a href="fs_making.html">several
tools</a> which can be used to generate UML-compatible filesystem
images from media.
<p>
The kernel will boot up and present you with a login prompt.
<p>
Note: If the host is configured with a 2G/2G address space split
rather than the usual 3G/1G split, then the packaged UML binaries will
not run. They will immediately segfault. See
<a href="2G-2G.html">this page</a> for the scoop on
running UML on your system.
</blockquote>
<a name="Logging in"/><table width="100%" bgcolor="#e0e0e0">
<tr>
<td>
<b>
<font color="black">Logging in</font>
</b>
</td>
</tr>
</table>
<blockquote head="Logging in">
<p>The prepackaged filesystems have a root account with
password 'root' and a user account with password 'user'. The
login banner will generally tell you how to log in. So, you log in
and you will find yourself inside a little virtual machine. Our
filesystems have a variety of commands and utilities installed (and it
is fairly easy to add more), so you will have a lot of tools with
which to poke around the system.
<p>There are a couple of other ways to log in:
<ul>
<li>
On a virtual console
<p>
Each virtual console that is configured (i.e. the
device exists in /dev and /etc/inittab runs a getty on it) will come up
in its own xterm. If you get tired of the xterms, read
<a href="input.html">this</a> to see how to
attach the consoles to something else, like host ptys.
</li>
<li>
Over the serial line
<p>
In the boot output, find a line that looks like:
<tt>
<pre>
<font size="-1">serial line 0 assigned pty /dev/ptyp1</font>
</pre>
</tt>
Attach your favorite terminal program to the corresponding
tty. I.e. for minicom, the command would be
<blockquote>
<tt>
<font color="#000000" where="host">host% minicom -o -p /dev/ttyp1</font>
</tt>
</blockquote>
</li>
<li>Over the net
<p>
If the network is running, then you can telnet to the virtual machine
and log in to it. See <a href="networking.html">the
networking page</a> to learn about setting up a virtual network.
</li>
</ul>
When you're done using it, run halt, and the kernel
will bring itself down and the process will exit.
</blockquote>
<a name="Examples"/><table width="100%" bgcolor="#e0e0e0">
<tr>
<td>
<b>
<font color="black">Examples</font>
</b>
</td>
</tr>
</table>
<blockquote head="Examples">
Here are some examples of UML in action:
<ul>
<li><a href="login.html">A login session</a></li>
<li><a href="net.html">A virtual network</a></li>
</ul>
</blockquote>
</td>
</tr>
</table>
<center>
<font size="-1">Hosted at </font>
<a href="http://sourceforge.net">
<img src="" width="88" height="31" border="0" alt="SourceForge Logo">
</a>
</center>
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