mirror of
https://gitlab.com/shorewall/code.git
synced 2024-11-23 08:03:11 +01:00
5666833021
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@8550 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
96 lines
3.9 KiB
XML
96 lines
3.9 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
<article>
|
|
<!--$Id$-->
|
|
|
|
<articleinfo>
|
|
<title>KVM (Kernel-mode Virtual Machine)</title>
|
|
|
|
<authorgroup>
|
|
<author>
|
|
<firstname>Tom</firstname>
|
|
|
|
<surname>Eastep</surname>
|
|
</author>
|
|
</authorgroup>
|
|
|
|
<pubdate><?dbtimestamp format="Y/m/d"?></pubdate>
|
|
|
|
<copyright>
|
|
<year>2008</year>
|
|
|
|
<holder>Thomas M. Eastep</holder>
|
|
</copyright>
|
|
|
|
<legalnotice>
|
|
<para>Permission is granted to copy, distribute and/or modify this
|
|
document under the terms of the GNU Free Documentation License, Version
|
|
1.2 or any later version published by the Free Software Foundation; with
|
|
no Invariant Sections, with no Front-Cover, and with no Back-Cover
|
|
Texts. A copy of the license is included in the section entitled
|
|
<quote><ulink url="GnuCopyright.htm">GNU Free Documentation
|
|
License</ulink></quote>.</para>
|
|
</legalnotice>
|
|
</articleinfo>
|
|
|
|
<section>
|
|
<title>Introduction</title>
|
|
|
|
<para>Kernel-mode Virtual Machines (<ulink
|
|
url="http://kvm.qumranet.com/">http://kvm.qumranet.com/</ulink>) is a
|
|
virtualization platform that leverages the virtualization capabilities
|
|
available with current microprocessors from both
|
|
<trademark>Intel</trademark> and <trademark>AMD</trademark>. For an
|
|
overview of KVM, please see my <ulink
|
|
url="http://www.shorewall.net/Linuxfest-2008.pdf">2008 Linuxfest Northwest
|
|
presentation</ulink>.</para>
|
|
|
|
<para>I use KVM to implement a number of virtual machines running various
|
|
Linux Distributions. The following diagram shows the entire
|
|
network.</para>
|
|
|
|
<graphic align="center" fileref="images/Network2008.png" />
|
|
|
|
<para>My personal laptop (Ursa) hosts the virtual machines. As shown in
|
|
the diagram, Ursa has routes to the internet through both the
|
|
<trademark>Linksys</trademark> WRT300N and through my Shorewall firewall.
|
|
This allows me to test the <ulink url="MultiISP.html">Shorewall Multi-ISP
|
|
feature</ulink>, even though I only have a single internet
|
|
connection</para>
|
|
|
|
<para>The Linux Bridges shown in the diagram are, of course, actually
|
|
within their associated system (Firewall or Ursa) but I've pictured them
|
|
separately.</para>
|
|
</section>
|
|
|
|
<section>
|
|
<title>Networking Configuration</title>
|
|
|
|
<para>I use a network configuration where each VM has it's own VNET and
|
|
tap device and the tap devices are all configured as ports on a Linux
|
|
Bridge. For clarity, I've only shown four of the virtual machines
|
|
available on the system.</para>
|
|
|
|
<graphic align="center" fileref="images/KVM1.png" />
|
|
|
|
<para>I run a DHCP server on the host to assign IP addresses to the VMs
|
|
and I also run dmsmasq to act as a nameserver for the VMs. The latter is
|
|
important when I take the laptop on the road. I'm currently running a
|
|
separate ISC DHCP server but I have it on my todo list to configure
|
|
dnsmasq as a DHCP server, thus eliminating one process on the
|
|
system.</para>
|
|
|
|
<para>The bridge is configured using the script described in my Linuxfest
|
|
presentation linked above. The script may be found at <ulink
|
|
url="http://www.shorewall.net/pub/shorewall/contrib/kvm/kvm">http://www.shorewall.net/pub/shorewall/contrib/kvm/kvm</ulink>.</para>
|
|
|
|
<para>With this configuration, and with only a single network interface on
|
|
the laptop, this is just a simple <ulink
|
|
url="two-interface.xml">two-interface masquerading setup</ulink> where the
|
|
local network interface is <filename class="devicefile">br0</filename>. As
|
|
with all bridges, <filename class="devicefile">br0</filename> must be
|
|
configured with the <option>routeback</option> option in <ulink
|
|
url="manpages/shorewall-interfaces.html">shorewall-interfaces</ulink>(5).</para>
|
|
</section>
|
|
</article> |