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Tom Eastep 2009-07-05 09:09:58 -07:00
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docs/OpenVZ.xml
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@ -18,7 +18,7 @@
<pubdate><?dbtimestamp format="Y/m/d"?></pubdate>
<copyright>
<year>2008</year>
<year>2009</year>
<holder>Thomas M. Eastep</holder>
</copyright>
@ -42,9 +42,10 @@
<trademark><ulink
url="http://www.parallels.com">Parallels</ulink></trademark> (formerly
<trademark>SWSoft</trademark>). Virtual servers take the form of
<firstterm>containers</firstterm> which are created via
<firstterm>templates</firstterm>. Templates are available for a wide
variety of distributions and architectures.</para>
<firstterm>containers</firstterm> (the OpenVZ documentation calls these
<firstterm>Virtual Environments</firstterm> or <firstterm>VEs</firstterm>)
which are created via <firstterm>templates</firstterm>. Templates are
available for a wide variety of distributions and architectures.</para>
<para>OpenVZ requires a patched kernel. Beginning with Lenny,
<trademark>Debian</trademark> supplies OpenVZ kernels through the standard
@ -70,10 +71,10 @@
interface
(<filename>/proc/sys/net/ipv4/conf/<replaceable>interface</replaceable>/proxy_arp</filename>).</para>
<para>OpenVZ creates virtual interfaces in the host with very odd
configurations.</para>
<para>OpenVZ creates a point-to-point virtual interface in the host with
a rather odd configuration.</para>
<para>Example:</para>
<para>Example (Single VE with IP address 206.124.146.178):</para>
<programlisting>gateway:~# <command>ip addr ls dev venet0</command>
10: venet0: &lt;BROADCAST,POINTOPOINT,NOARP,UP,LOWER_UP&gt; mtu 1500 qdisc noqueue state UNKNOWN
@ -85,8 +86,8 @@ gateway:~# </programlisting>
<para>The interface has no IP configuration yet it has a route to
206.124.146.178!</para>
<para>From within the container with IP address 206.124.146.178, we have
the following:</para>
<para>From within the VE with IP address 206.124.146.178, we have the
following:</para>
<programlisting>server:~ # <command>ip addr ls</command>
1: lo: &lt;LOOPBACK,UP,LOWER_UP&gt; mtu 16436 qdisc noqueue state UNKNOWN
@ -169,36 +170,57 @@ vz venet0 - </programlisting>
<programlisting>#SOURCE DEST PROVIDER PRIORITY
- 206.124.146.178 main 1000</programlisting>
</section>
<section>
<title>RFC 1918 Addresses in a Container</title>
<para>You can assign an RFC 1918 address to a VE and use masquerade/SNAT
to provide Internet access to the container. This is just a normal
simple Shorewall configuration as shown in the <ulink
url="two-interface.htm">Two-interface Quick Start Guide</ulink>. In this
configuration the firewall's internal interface is <filename
class="devicefile">venet0</filename>.</para>
</section>
</section>
<section>
<title>Shorewall in an OpenVZ Container</title>
<title>Shorewall in an OpenVZ Virtual Environment</title>
<para>If you have optained an OpenVZ container from a service provider,
you may find it difficult to configure any type of firewall within the
container. There are two container parameters that control iptables
behavior within the container:</para>
<para>If you have obtained an OpenVZ VE from a service provider, you may
find it difficult to configure any type of firewall within your VE. There
are two VE parameters that control iptables behavior within the
container:</para>
<variablelist>
<varlistentry>
<term>--iptables <replaceable>name </replaceable></term>
<listitem>
<para>Restrict access to iptables modules inside a container (by
default all iptables modules that are loaded in the host system are
accessible inside a container).</para>
<para>Restrict access to iptables modules inside a container (The
OpenVZ claims that by default all iptables modules that are loaded
in the host system are accessible inside a container; I haven't
tried that).</para>
<para>You can use the following values for name: iptable_filter,
iptable_mangle, ipt_limit, ipt_multiport, ipt_tos, ipt_TOS,
ipt_REJECT, ipt_TCPMSS, ipt_tcpmss, ipt_ttl, ipt_LOG, ipt_length,
ip_conntrack, ip_conntrack_ftp, ip_conntrack_irc, ipt_conntrack,
ipt_state, ipt_helper, iptable_nat, ip_nat_ftp, ip_nat_irc,
ipt_REDIRECT, xt_mac, ipt_owner.</para>
<para>You can use the following values for
<replaceable>name</replaceable>: <option>iptable_filter</option>,
<option>iptable_mangle</option>, <option>ipt_limit</option>,
<option>ipt_multiport</option>, <option>ipt_tos</option>,
<option>ipt_TOS</option>, <option>ipt_REJECT</option>,
<option>ipt_TCPMSS</option>, <option>ipt_tcpmss</option>,
<option>ipt_ttl</option>, <option>ipt_LOG</option>,
<option>ipt_length</option>, <option>ip_conntrack</option>,
<option>ip_conntrack_ftp</option>,
<option>ip_conntrack_irc</option>, <option>ipt_conntrack</option>,
<option>ipt_state</option>, <option>ipt_helper</option>,
<option>iptable_nat</option>, <option>ip_nat_ftp</option>,
<option>ip_nat_irc</option>, <option>ipt_REDIRECT</option>,
<option>xt_mac</option>, <option>ipt_owner</option>.</para>
<para>If your provider is using this option, you may be in deep
trouble using Shorewall. Look at the output of <command>shorewall
show capabilities</command> and weep. Then try to get your provider
to remove this restriction on your container.</para>
trouble trying to use Shorewall in your container. Look at the
output of <command>shorewall show capabilities</command> and weep.
Then try to get your provider to remove this restriction on your
container.</para>
</listitem>
</varlistentry>