openstack/openstack-manuals
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openstack-manuals/doc/install-guide/section_neutron-initial-networks.xml
Anne Gentle cfa87df9fa Minor edits to the install guide 
- Removed revision history grizzly and prior
- Edit for Neutron/OpenStack Networking

Change-Id: I4273eef0699056f10a75abe906ec2220edc7248b
2014-02-28 15:19:58 +01:00

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<?xml version="1.0" encoding="UTF-8"?>
<section xml:id="neutron-initial-networks"
xmlns="http://docbook.org/ns/docbook"
xmlns:xi="http://www.w3.org/2001/XInclude"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:html="http://www.w3.org/1999/xhtml" version="5.0">
<title>Create initial networks</title>
<note>
<para>In these sections, replace <replaceable>SPECIAL_OPTIONS</replaceable> with any options specific to your OpenStack Networking plug-in choices. See <link
linkend="install-neutron.configure-networks.plug-in-specific"
>here</link> to check if your plug-in requires any special options.</para>
</note>
<procedure>
<step>
<para>Create the <literal>ext-net</literal> external network. This
network represents a slice of the outside world. VMs are not directly
linked to this network; instead, they connect to internal networks.
Outgoing traffic is routed by OpenStack Networking to the external
network. Additionally, floating IP addresses from the subnet for
<literal>ext-net</literal> might be assigned to VMs so that the
external network can contact them. Neutron-based services route the
traffic appropriately.</para>
<screen><prompt>#</prompt> <userinput>neutron net-create ext-net --router:external=True <replaceable>SPECIAL_OPTIONS</replaceable></userinput></screen>
</step>
<step>
<para>Create the associated subnet with the same gateway and
CIDR as <replaceable>EXTERNAL_INTERFACE</replaceable>. It
does not have DHCP because it represents a slice of the
external world:</para>
<screen><prompt>#</prompt> <userinput>neutron subnet-create ext-net \
--allocation-pool start=<replaceable>FLOATING_IP_START</replaceable>,end=<replaceable>FLOATING_IP_END</replaceable> \
--gateway=<replaceable>EXTERNAL_INTERFACE_GATEWAY</replaceable> --enable_dhcp=False \
<replaceable>EXTERNAL_INTERFACE_CIDR</replaceable></userinput></screen>
</step>
<step>
<para>Create one or more initial tenants, for example:</para>
<screen><prompt>#</prompt> <userinput>keystone tenant-create --name <replaceable>DEMO_TENANT</replaceable></userinput></screen>
<para os="rhel;centos;fedora;opensuse;sles;ubuntu"> See <xref
linkend="keystone-users"/> for further details.</para>
<para os="debian"> See <xref linkend="keystone-install"/> for
further details.</para>
</step>
<step>
<para>Create the router attached to the external network. This
router routes traffic to the internal subnets as
appropriate. You can create it under a given tenant: Append
<literal>--tenant-id</literal> option with a value of
<replaceable>DEMO_TENANT_ID</replaceable> to the
command.</para>
<para>Use the following to quickly get the
<replaceable>DEMO_TENANT</replaceable> tenant-id:</para>
<screen><prompt>#</prompt> <userinput>keystone tenant-list | grep <replaceable>DEMO_TENANT</replaceable> | awk '{print $2;}'</userinput></screen>
<para>Then create the router:</para>
<screen><prompt>#</prompt> <userinput>neutron router-create ext-to-int --tenant-id <replaceable>DEMO_TENANT_ID</replaceable></userinput></screen>
</step>
<step>
<para>Connect the router to <literal>ext-net</literal> by
setting the gateway for the router as
<literal>ext-net</literal>:</para>
<screen><prompt>#</prompt> <userinput>neutron router-gateway-set <replaceable>EXT_TO_INT_ID</replaceable> <replaceable>EXT_NET_ID</replaceable></userinput></screen>
</step>
<step>
<para>Create an internal network for
<replaceable>DEMO_TENANT</replaceable> (and associated
subnet over an arbitrary internal IP range, such as,
<literal>10.5.5.0/24</literal>), and connect it to the
router by setting it as a port:</para>
<screen><prompt>#</prompt> <userinput>neutron net-create --tenant-id <replaceable>DEMO_TENANT_ID</replaceable> demo-net <replaceable>SPECIAL_OPTIONS</replaceable></userinput>
<prompt>#</prompt> <userinput>neutron subnet-create --tenant-id <replaceable>DEMO_TENANT_ID</replaceable> demo-net 10.5.5.0/24 --gateway 10.5.5.1</userinput>
<prompt>#</prompt> <userinput>neutron router-interface-add <replaceable>EXT_TO_INT_ID</replaceable> <replaceable>DEMO_NET_SUBNET_ID</replaceable></userinput></screen>
</step>
<step>
<para>Check the special options page for your plug-in for
remaining steps. Now, return to the general
<acronym>OVS</acronym> instructions.</para>
</step>
</procedure>
<section
xml:id="install-neutron.configure-networks.plug-in-specific">
<title>Plug-in-specific Neutron network options</title>
<section
xml:id="install-neutron.configure-networks.plug-in-specific.ovs">
<title>Open vSwitch Network configuration options</title>
<section
xml:id="install-neutron.configure-networks.plug-in-specific.ovs.gre">
<title>GRE tunneling network options</title>
<note>
<para>While this guide currently enables network
namespaces by default, you can disable them if you have
issues or your kernel does not support them. If you
disabled namespaces, you must perform some additional
configuration for the L3 agent.</para>
<para>After you create all the networks, tell the L3 agent
what the external network ID is, as well as the ID of
the router associated with this machine (because you are
not using namespaces, there can be only one router for
each machine). To do this, edit the
<filename>/etc/neutron/l3_agent.ini</filename>
file:</para>
<programlisting language="ini">gateway_external_network_id = <replaceable>EXT_NET_ID</replaceable>
router_id = <replaceable>EXT_TO_INT_ID</replaceable></programlisting>
<para>Then, restart the L3 agent:</para>
<screen><prompt>#</prompt> <userinput>service neutron-l3-agent restart</userinput></screen>
</note>
<para>When creating networks, you should use the
options:</para>
<screen><userinput>--provider:network_type gre --provider:segmentation_id SEG_ID</userinput></screen>
<para><replaceable>SEG_ID</replaceable> should be
<literal>2</literal> for the external network, and just
any unique number inside the tunnel range specified before
for any other network.</para>
<note>
<para>These options are not needed beyond the first
network, as OpenStack Networking services automatically
increment the segmentation ID and copy the network type
option for any additional networks.</para>
</note>
<para>Now, return to the general <link linkend="install-neutron.install-plugin-compute.ovs"></link><acronym>OVS</acronym>
instructions.</para>
</section>
<section
xml:id="install-neutron.configure-networks.plug-in-specific.ovs.vlan">
<title>VLAN network options</title>
<warning>
<para>Some NICs have Linux drivers that do not handle
VLANs properly. See the
<literal>ovs-vlan-bug-workaround</literal> and
<literal>ovs-vlan-test</literal> man pages for more
information. Additionally, you might try turning off
<literal>rx-vlan-offload</literal> and
<literal>tx-vlan-offload</literal> by using
<command>ethtool</command> on the
<replaceable>DATA_INTERFACE</replaceable>. Another
potential caveat to VLAN functionality is that VLAN tags
add an additional 4 bytes to the packet size. If your
NICs cannot handle large packets, make sure to set the
MTU to a value that is 4 bytes less than the normal
value on the
<replaceable>DATA_INTERFACE</replaceable>.</para>
<para>If you run OpenStack inside a virtualized
environment (for testing purposes), switching to the
<literal>virtio</literal> NIC type (or a similar
technology if you are not using KVM/QEMU to run your
host VMs) might solve the issue.</para>
</warning>
<para>When creating networks, use these options:</para>
<screen><userinput>--provider:network_type vlan --provider:physical_network physnet1 --provider:segmentation_id SEG_ID</userinput> </screen>
<para><replaceable>SEG_ID</replaceable> should be
<literal>2</literal> for the external network, and just
any unique number inside the vlan range specified above
for any other network.</para>
<note>
<para>These options are not needed beyond the first
network, as Neutron automatically increments the
segmentation ID and copies the network type and physical
network options for any additional networks. They are
only needed if you wish to modify those values in any
way.</para>
</note>
</section>
</section>
</section>
</section>
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