72 lines
4.0 KiB
XML
72 lines
4.0 KiB
XML
<section xmlns="http://docbook.org/ns/docbook" xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0"
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xml:id="section_configuring-compute-to-use-ipv6-addresses">
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<title>Configure Compute to use IPv6 addresses</title>
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<para>If you are using OpenStack Compute with
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<systemitem>nova-network</systemitem>, you can put Compute into dual-stack
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mode, so that it uses both IPv4 and IPv6 addresses for communication. In
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dual-stack mode, instances can acquire their IPv6 global unicast address
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by using a stateless address auto-configuration mechanism [RFC 4862/2462].
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IPv4/IPv6 dual-stack mode works with both <literal>VlanManager</literal>
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and <literal>FlatDHCPManager</literal> networking modes.
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</para>
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<para>In <literal>VlanManager</literal> networking mode, each project uses a
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different 64-bit global routing prefix. In
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<literal>FlatDHCPManager</literal> mode, all instances use one 64-bit
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global routing prefix.
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</para>
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<para>This configuration was tested with virtual machine images that have an
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IPv6 stateless address auto-configuration capability. This capability is
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required for any VM to run with an IPv6 address. You must use an EUI-64
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address for stateless address auto-configuration. Each node that executes
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a <literal>nova-*</literal> service must have
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<literal>python-netaddr</literal> and <literal>radvd</literal> installed.
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</para>
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<procedure>
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<title>Switch into IPv4/IPv6 dual-stack mode</title>
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<step>
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<para>For every node running a <literal>nova-*</literal> service,
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install <systemitem>python-netaddr</systemitem>:
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</para>
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<screen><prompt>#</prompt> <userinput>apt-get install python-netaddr</userinput></screen>
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</step>
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<step>
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<para>For every node running <literal>nova-network</literal>, install
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<literal>radvd</literal> and configure IPv6 networking:
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</para>
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<screen><prompt>#</prompt> <userinput>apt-get install radvd</userinput>
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<prompt>#</prompt> <userinput>echo 1 > /proc/sys/net/ipv6/conf/all/forwarding</userinput>
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<prompt>#</prompt> <userinput>echo 0 > /proc/sys/net/ipv6/conf/all/accept_ra</userinput></screen>
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</step>
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<step>
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<para>On all nodes, edit the <filename>nova.conf</filename> file and
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specify <literal>use_ipv6 = True</literal>.</para>
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</step>
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<step>
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<para>Restart all <literal>nova-*</literal> services.</para>
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</step>
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</procedure>
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<note>
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<para>You can add a fixed range for IPv6 addresses to the <command>nova network-create</command>
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command. Specify <option>public</option> or <option>private</option> after the
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<parameter>network-create</parameter> parameter.
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</para>
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<screen><prompt>$</prompt> <userinput>nova network-create public --fixed-range-v4 <replaceable>FIXED_RANGE_V4</replaceable> --vlan <replaceable>VLAN_ID</replaceable> --vpn <replaceable>VPN_START</replaceable> --fixed-range-v6 <replaceable>FIXED_RANGE_V6</replaceable></userinput></screen>
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<para>You can set the IPv6 global routing prefix by using the
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<parameter>--fixed_range_v6</parameter> parameter. The default value for
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the parameter is <literal>fd00::/48</literal>.
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</para>
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<para>When you use <literal>FlatDHCPManager</literal>, the command
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uses the original <parameter>--fixed_range_v6</parameter> value. For
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example:
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</para>
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<screen><prompt>$</prompt> <userinput>nova network-create public --fixed-range-v4 10.0.2.0/24 --fixed-range-v6 fd00:1::/48</userinput></screen>
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<para>When you use <literal>VlanManager</literal>, the command increments
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the subnet ID to create subnet prefixes. Guest VMs use this prefix to
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generate their IPv6 global unicast address. For example:
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</para>
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<screen><prompt>$</prompt> <userinput>nova network-create public --fixed-range-v4 10.0.1.0/24 --vlan 100 --vpn 1000 --fixed-range-v6 fd00:1::/48</userinput></screen>
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</note>
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<xi:include href="../../common/tables/nova-ipv6.xml"/>
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</section>
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