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<td valign="top" align="left">
<center>
<h3>The Management Console</h3>
</center>
The UML management console is a low-level interface to the kernel,
somewhat like the i386 SysRq interface. Since there is a full-blown
operating system under UML, there is much greater flexibility possible
than with the SysRq mechanism.
<p>
At this point, there are three things you can do with the mconsole
interface:
<ul>
<li>
get the kernel version
</li>
<li>
add and remove devices
</li>
<li>
halt or reboot the machine
</li>
</ul>
<p>
You need the mconsole client (uml_mconsole) which is present in CVS
(/tools/mconsole) in 2.4.5-9um and later, and will be in the RPM in 2.4.6.
<p>
You also need CONFIG_MCONSOLE (under 'General Setup') enabled in UML.
When you boot UML, you'll see a line like:
<blockquote>
<tt>
<font color="#000000">mconsole initialized on /home/jdike/.uml/umlNJ32yL/mconsole</font>
</tt>
</blockquote>
If you specify a unique machine id one the UML command line, i.e.
<blockquote>
<tt>
<font color="#000000">umid=debian</font>
</tt>
</blockquote>
you'll see this
<blockquote>
<tt>
<font color="#000000">mconsole initialized on /home/jdike/.uml/debian/mconsole</font>
</tt>
</blockquote>
That file is the socket that uml_mconsole will use to communicate
with UML. Run it with either the umid or the full path as its argument:
<blockquote>
<tt>
<font color="#000000">uml_mconsole debian</font>
</tt>
</blockquote>
or
<blockquote>
<tt>
<font color="#000000">uml_mconsole /home/jdike/.uml/debian/mconsole</font>
</tt>
</blockquote>
You'll get a prompt, at which you can run one of these commands:
<ul>
<li>
version
</li>
<li>
halt
</li>
<li>
reboot
</li>
<li>
config
</li>
<li>
remove
</li>
<li>
sysrq
</li>
<li>
help
</li>
<li>
cad
</li>
</ul>
<a name="version"/><table width="100%" bgcolor="#e0e0e0">
<tr>
<td>
<b>
<font color="black">version</font>
</b>
</td>
</tr>
</table>
<blockquote head="version">
This takes no arguments. It prints the UML version.
<tt>
<pre>
<font size="-1">
(mconsole) version
OK Linux usermode 2.4.5-9um #1 Wed Jun 20 22:47:08 EDT 2001 i686
</font>
</pre>
</tt>
</blockquote>
<a name="halt and reboot"/><table width="100%" bgcolor="#e0e0e0">
<tr>
<td>
<b>
<font color="black">halt and reboot</font>
</b>
</td>
</tr>
</table>
<blockquote head="halt and reboot">
These take no arguments. They shut the machine down immediately, with
no syncing of disks and no clean shutdown of userspace. So, they are
pretty close to crashing the machine.
<tt>
<pre>
<font size="-1">
(mconsole) halt
OK
</font>
</pre>
</tt>
</blockquote>
<a name="config"/><table width="100%" bgcolor="#e0e0e0">
<tr>
<td>
<b>
<font color="black">config</font>
</b>
</td>
</tr>
</table>
<blockquote head="config">
"config" adds a new device to the virtual machine. Currently the
ubd and network drivers support this. It takes one argument, which is
the device to add, with the same syntax as the kernel command line.
<tt>
<pre>
<font size="-1">
(mconsole) config ubd3=/home/jdike/incoming/roots/root_fs_debian22
OK
(mconsole) config eth1=mcast
OK
</font>
</pre>
</tt>
</blockquote>
<a name="remove"/><table width="100%" bgcolor="#e0e0e0">
<tr>
<td>
<b>
<font color="black">remove</font>
</b>
</td>
</tr>
</table>
<blockquote head="remove">
"remove" deletes a device from the system. Its argument is just the
name of the device to be removed. The device must be idle in
whatever sense the driver considers necessary. In the case of the ubd
driver, the removed block device must not be mounted, swapped on, or
otherwise open, and in the case of the network driver, the device must be down.
<tt>
<pre>
<font size="-1">
(mconsole) remove ubd3
OK
(mconsole) remove eth1
OK
</font>
</pre>
</tt>
</blockquote>
<a name="sysrq"/><table width="100%" bgcolor="#e0e0e0">
<tr>
<td>
<b>
<font color="black">sysrq</font>
</b>
</td>
</tr>
</table>
<blockquote head="sysrq">
This takes one argument, which is a single letter. It calls the
generic kernel's SysRq driver, which does whatever is called for by
that argument. See the SysRq documentation in Documentation/sysrq.txt
in your favorite kernel tree to see what letters are valid and what
they do.
</blockquote>
<a name="help"/><table width="100%" bgcolor="#e0e0e0">
<tr>
<td>
<b>
<font color="black">help</font>
</b>
</td>
</tr>
</table>
<blockquote head="help">
"help" returns a string listing the valid commands and what each one does.
</blockquote>
<a name="cad"/><table width="100%" bgcolor="#e0e0e0">
<tr>
<td>
<b>
<font color="black">cad</font>
</b>
</td>
</tr>
</table>
<blockquote head="cad">
This invokes the Ctl-Alt-Del action on init. What exactly this ends
up doing is up to /etc/inittab. Normally, it reboots the machine.
With UML, this is usually not desired, so if a halt would be better,
then find the section of inittab that looks like this
<tt>
<pre>
<font size="-1">
# What to do when CTRL-ALT-DEL is pressed.
ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now
</font>
</pre>
</tt>
and change the command to halt.
</blockquote>
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