f1324d73f1
Update the service names under neutron section. For suse based releases the packages are named as 'openstack-$project-*.service' Change-Id: I1b6ae0ae2ef39d50a89813930d4eda587c346808
576 lines
26 KiB
XML
576 lines
26 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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version="5.0"
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xml:id="neutron-network-node">
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<title>Install and configure network node</title>
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<para>The network node primarily handles internal and external routing
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and <glossterm>DHCP</glossterm> services for virtual networks.</para>
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<procedure>
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<title>To configure prerequisites</title>
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<para>Before you install and configure OpenStack Networking, you
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must configure certain kernel networking parameters.</para>
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<step>
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<para>Edit the <filename>/etc/sysctl.conf</filename> file to
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contain the following parameters:</para>
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<programlisting>net.ipv4.ip_forward=1
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net.ipv4.conf.all.rp_filter=0
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net.ipv4.conf.default.rp_filter=0</programlisting>
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</step>
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<step>
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<para>Implement the changes:</para>
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<screen><prompt>#</prompt> <userinput>sysctl -p</userinput></screen>
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</step>
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</procedure>
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<procedure os="ubuntu;rhel;centos;fedora;sles;opensuse">
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<title>To install the Networking components</title>
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<step>
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<screen os="ubuntu"><prompt>#</prompt> <userinput>apt-get install neutron-plugin-ml2 neutron-plugin-openvswitch-agent \
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neutron-l3-agent neutron-dhcp-agent neutron-metadata-agent</userinput></screen>
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<screen os="rhel;centos;fedora"><prompt>#</prompt> <userinput>yum install openstack-neutron openstack-neutron-ml2 openstack-neutron-openvswitch</userinput></screen>
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<screen os="sles;opensuse"><prompt>#</prompt> <userinput>zypper install --no-recommends openstack-neutron-openvswitch-agent openstack-neutron-l3-agent \
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openstack-neutron-dhcp-agent openstack-neutron-metadata-agent ipset</userinput></screen>
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<note os="sles;opensuse">
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<para>SUSE does not use a separate ML2 plug-in package.</para>
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</note>
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</step>
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</procedure>
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<procedure os="debian">
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<title>To install and configure the Networking components</title>
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<step>
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<screen><prompt>#</prompt> <userinput>apt-get install neutron-plugin-openvswitch-agent openvswitch-datapath-dkms \
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neutron-l3-agent neutron-dhcp-agent neutron-metadata-agent</userinput></screen>
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<note>
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<para>Debian does not use a separate ML2 plug-in package.</para>
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</note>
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</step>
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<step>
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<para>Respond to prompts for
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<link linkend="debconf-dbconfig-common">database management</link>,
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<link linkend="debconf-keystone_authtoken">Identity service
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credentials</link>,
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<link linkend="debconf-api-endpoints">service endpoint
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registration</link>, and
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<link linkend="debconf-rabbitmq">message queue
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credentials</link>.</para>
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</step>
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<step>
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<para>Select the ML2 plug-in:</para>
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<informalfigure>
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<mediaobject>
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<imageobject>
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<imagedata scale="50"
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fileref="figures/debconf-screenshots/neutron_1_plugin_selection.png"
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/>
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</imageobject>
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</mediaobject>
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</informalfigure>
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<note>
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<para>Selecting the ML2 plug-in also populates the
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<option>service_plugins</option> and
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<option>allow_overlapping_ips</option> options in the
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<filename>/etc/neutron/neutron.conf</filename> file with the
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appropriate values.</para>
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</note>
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</step>
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</procedure>
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<procedure os="ubuntu;rhel;centos;fedora;sles;opensuse">
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<title>To configure the Networking common components</title>
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<para>The Networking common component configuration includes the
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authentication mechanism, message queue, and plug-in.</para>
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<note>
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<para>Default configuration files vary by distribution. You might need
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to add these sections and options rather than modifying existing
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sections and options. Also, an ellipsis (...) in the configuration
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snippets indicates potential default configuration options that you
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should retain.</para>
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</note>
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<step>
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<para>Edit the <filename>/etc/neutron/neutron.conf</filename> file
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and complete the following actions:</para>
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<substeps>
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<step>
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<para>In the <literal>[database]</literal> section, comment out
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any <literal>connection</literal> options because network nodes
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do not directly access the database.</para>
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</step>
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<step>
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<para>In the <literal>[DEFAULT]</literal> and
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<literal>[oslo_messaging_rabbit]</literal> sections, configure
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<application>RabbitMQ</application> message queue access:</para>
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<programlisting language="ini">[DEFAULT]
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...
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rpc_backend = rabbit
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[oslo_messaging_rabbit]
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...
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rabbit_host = <replaceable>controller</replaceable>
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rabbit_userid = openstack
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rabbit_password = <replaceable>RABBIT_PASS</replaceable></programlisting>
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<para>Replace <replaceable>RABBIT_PASS</replaceable> with the
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password you chose for the <literal>openstack</literal> account
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in <application>RabbitMQ</application>.</para>
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</step>
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<step>
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<para>In the <literal>[DEFAULT]</literal> and
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<literal>[keystone_authtoken]</literal> sections,
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configure Identity service access:</para>
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<programlisting language="ini">[DEFAULT]
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...
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auth_strategy = keystone
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[keystone_authtoken]
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...
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auth_uri = http://<replaceable>controller</replaceable>:5000
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auth_url = http://<replaceable>controller</replaceable>:35357
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auth_plugin = password
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project_domain_id = default
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user_domain_id = default
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project_name = service
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username = neutron
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password = <replaceable>NEUTRON_PASS</replaceable></programlisting>
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<para>Replace <replaceable>NEUTRON_PASS</replaceable> with the
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password you chose or the <literal>neutron</literal> user in the
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Identity service.</para>
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<note>
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<para>Comment out or remove any other options in the
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<literal>[keystone_authtoken]</literal> section.</para>
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</note>
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</step>
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<step>
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<para>In the <literal>[DEFAULT]</literal> section,
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enable the Modular Layer 2 (ML2) plug-in,
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router service, and overlapping IP addresses:</para>
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<programlisting language="ini">[DEFAULT]
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...
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core_plugin = ml2
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service_plugins = router
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allow_overlapping_ips = True</programlisting>
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</step>
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<step>
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<para>(Optional) To assist with troubleshooting,
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enable verbose logging in the <literal>[DEFAULT]</literal>
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section:</para>
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<programlisting language="ini">[DEFAULT]
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...
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verbose = True</programlisting>
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</step>
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</substeps>
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</step>
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</procedure>
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<procedure>
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<title>To configure the Modular Layer 2 (ML2) plug-in</title>
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<para>The ML2 plug-in uses the
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<glossterm baseform="Open vSwitch">Open vSwitch (OVS)</glossterm>
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mechanism (agent) to build the virtual networking framework for
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instances.</para>
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<step>
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<para>Edit the
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<filename>/etc/neutron/plugins/ml2/ml2_conf.ini</filename>
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file and complete the following actions:</para>
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<substeps>
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<step os="ubuntu;rhel;centos;fedora;sles;opensuse">
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<para>In the <literal>[ml2]</literal> section, enable the
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<glossterm baseform="flat network">flat</glossterm>,
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<glossterm baseform="VLAN network">VLAN</glossterm>,
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<glossterm>generic routing encapsulation (GRE)</glossterm>, and
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<glossterm>virtual extensible LAN (VXLAN)</glossterm>
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network type drivers, GRE tenant networks, and the OVS
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mechanism driver:</para>
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<programlisting language="ini">[ml2]
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...
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type_drivers = flat,vlan,gre,vxlan
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tenant_network_types = gre
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mechanism_drivers = openvswitch</programlisting>
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</step>
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<step>
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<para>In the <literal>[ml2_type_flat]</literal> section,
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configure the external flat provider network:</para>
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<programlisting language="ini">[ml2_type_flat]
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...
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flat_networks = external</programlisting>
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</step>
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<step os="ubuntu;rhel;centos;fedora;sles;opensuse">
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<para>In the <literal>[ml2_type_gre]</literal> section,
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configure the tunnel identifier (id) range:</para>
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<programlisting language="ini">[ml2_type_gre]
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...
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tunnel_id_ranges = 1:1000</programlisting>
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</step>
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<step os="ubuntu;rhel;centos;fedora;sles;opensuse">
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<para>In the <literal>[securitygroup]</literal>
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section, enable security groups, enable
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<glossterm>ipset</glossterm>, and configure
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the OVS <glossterm>iptables</glossterm> firewall
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driver:</para>
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<programlisting language="ini">[securitygroup]
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...
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enable_security_group = True
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enable_ipset = True
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firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver</programlisting>
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</step>
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<step>
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<para>In the <literal>[ovs]</literal> section, enable tunnels,
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configure the local tunnel endpoint, and map the external flat
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provider network to the <literal>br-ex</literal> external
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network bridge:</para>
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<programlisting language="ini">[ovs]
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...
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local_ip = <replaceable>INSTANCE_TUNNELS_INTERFACE_IP_ADDRESS</replaceable>
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bridge_mappings = external:br-ex</programlisting>
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<para>Replace
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<replaceable>INSTANCE_TUNNELS_INTERFACE_IP_ADDRESS</replaceable>
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with the IP address of the instance
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tunnels network interface on your network node.</para>
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</step>
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<step>
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<para>In the <literal>[agent]</literal> section, enable GRE
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tunnels:</para>
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<programlisting language="ini">[agent]
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...
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tunnel_types = gre</programlisting>
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</step>
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</substeps>
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</step>
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</procedure>
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<procedure os="ubuntu;rhel;centos;fedora;sles;opensuse">
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<title>To configure the Layer-3 (L3) agent</title>
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<para>The <glossterm>Layer-3 (L3) agent</glossterm> provides
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routing services for virtual networks.</para>
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<step>
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<para>Edit the <filename>/etc/neutron/l3_agent.ini</filename>
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file and complete the following actions:</para>
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<substeps>
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<step>
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<para>In the <literal>[DEFAULT]</literal> section, configure
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the interface driver, external network bridge, and enable
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deletion of defunct router namespaces:</para>
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<programlisting language="ini">[DEFAULT]
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...
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interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver
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external_network_bridge =
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router_delete_namespaces = True</programlisting>
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<note>
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<para>The <literal>external_network_bridge</literal> option
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intentionally lacks a value to enable multiple external
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networks on a single agent.</para>
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</note>
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</step>
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<step>
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<para>(Optional) To assist with troubleshooting,
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enable verbose logging in the <literal>[DEFAULT]</literal>
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section:</para>
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<programlisting language="ini">[DEFAULT]
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...
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verbose = True</programlisting>
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</step>
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</substeps>
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</step>
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</procedure>
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<procedure>
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<title>To configure the DHCP agent</title>
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<para>The <glossterm>DHCP agent</glossterm> provides DHCP
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services for virtual networks.</para>
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<step os="ubuntu;rhel;centos;fedora;sles;opensuse">
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<para>Edit the
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<filename>/etc/neutron/dhcp_agent.ini</filename> file
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and complete the following actions:</para>
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<substeps>
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<step>
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<para>In the <literal>[DEFAULT]</literal> section, configure
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the interface and DHCP drivers and enable deletion of defunct
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DHCP namespaces:</para>
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<programlisting language="ini">[DEFAULT]
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...
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interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver
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dhcp_driver = neutron.agent.linux.dhcp.Dnsmasq
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dhcp_delete_namespaces = True</programlisting>
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</step>
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<step>
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<para>(Optional) To assist with troubleshooting,
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enable verbose logging in the <literal>[DEFAULT]</literal>
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section:</para>
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<programlisting language="ini">[DEFAULT]
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...
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verbose = True</programlisting>
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</step>
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</substeps>
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</step>
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<step>
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<para>(Optional)</para>
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<para>Tunneling protocols such as GRE include additional packet
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headers that increase overhead and decrease space available for the
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payload or user data. Without knowledge of the virtual network
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infrastructure, instances attempt to send packets using the default
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Ethernet <glossterm>maximum transmission unit (MTU)</glossterm> of
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1500 bytes. <glossterm>Internet protocol (IP)</glossterm> networks
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contain the <glossterm>path MTU discovery (PMTUD)</glossterm>
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mechanism to detect end-to-end MTU and adjust packet size
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accordingly. However, some operating systems and networks block or
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otherwise lack support for PMTUD causing performance degradation
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or connectivity failure.</para>
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<para>Ideally, you can prevent these problems by enabling
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<glossterm baseform="jumbo frame">jumbo frames</glossterm> on the
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physical network that contains your tenant virtual networks.
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Jumbo frames support MTUs up to approximately 9000 bytes which
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negates the impact of GRE overhead on virtual networks. However,
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many network devices lack support for jumbo frames and OpenStack
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administrators often lack control over network infrastructure.
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Given the latter complications, you can also prevent MTU problems
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by reducing the instance MTU to account for GRE overhead.
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Determining the proper MTU value often takes experimentation,
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but 1454 bytes works in most environments. You can configure the
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DHCP server that assigns IP addresses to your instances to also
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adjust the MTU.</para>
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<note>
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<para>Some cloud images ignore the DHCP MTU option in which case
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you should configure it using metadata, a script, or another suitable
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method.</para>
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</note>
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<substeps>
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<step>
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<para>Edit the <filename>/etc/neutron/dhcp_agent.ini</filename>
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file and complete the following action:</para>
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<substeps>
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<step>
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<para>In the <literal>[DEFAULT]</literal> section, enable the
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<glossterm>dnsmasq</glossterm> configuration file:</para>
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<programlisting language="ini">[DEFAULT]
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...
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dnsmasq_config_file = /etc/neutron/dnsmasq-neutron.conf</programlisting>
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</step>
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</substeps>
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</step>
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<step>
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<para>Create and edit the
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<filename>/etc/neutron/dnsmasq-neutron.conf</filename> file and
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complete the following action:</para>
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<substeps>
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<step>
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<para>Enable the DHCP MTU option (26) and configure it to
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1454 bytes:</para>
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<programlisting language="ini">dhcp-option-force=26,1454</programlisting>
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</step>
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</substeps>
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</step>
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<step>
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<para>Kill any existing
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<systemitem role="process">dnsmasq</systemitem> processes:</para>
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<screen><prompt>#</prompt> <userinput>pkill dnsmasq</userinput></screen>
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</step>
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</substeps>
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</step>
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</procedure>
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<procedure>
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<title>To configure the metadata agent</title>
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<para>The <glossterm baseform="Metadata agent">metadata agent</glossterm>
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provides configuration information such as credentials to
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instances.</para>
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<step>
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<para>Edit the <filename>/etc/neutron/metadata_agent.ini</filename>
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file and complete the following actions:</para>
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<substeps>
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<step>
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<para>In the <literal>[DEFAULT]</literal> section, configure
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access parameters:</para>
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<programlisting language="ini">[DEFAULT]
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...
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auth_uri = http://<replaceable>controller</replaceable>:5000
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auth_url = http://<replaceable>controller</replaceable>:35357
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auth_region = RegionOne
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auth_plugin = password
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project_domain_id = default
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user_domain_id = default
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project_name = service
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username = neutron
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password = <replaceable>NEUTRON_PASS</replaceable></programlisting>
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<para>Replace <replaceable>NEUTRON_PASS</replaceable> with the
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password you chose for the <literal>neutron</literal> user in
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the Identity service.</para>
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</step>
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<step>
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<para>In the <literal>[DEFAULT]</literal> section, configure the
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metadata host:</para>
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<programlisting language="ini">[DEFAULT]
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...
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nova_metadata_ip = <replaceable>controller</replaceable></programlisting>
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</step>
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<step>
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<para>In the <literal>[DEFAULT]</literal> section, configure the
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metadata proxy shared secret:</para>
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<programlisting language="ini">[DEFAULT]
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...
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metadata_proxy_shared_secret = <replaceable>METADATA_SECRET</replaceable></programlisting>
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<para>Replace <replaceable>METADATA_SECRET</replaceable> with a
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suitable secret for the metadata proxy.</para>
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</step>
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<step>
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<para>(Optional) To assist with troubleshooting,
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enable verbose logging in the <literal>[DEFAULT]</literal>
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section:</para>
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<programlisting language="ini">[DEFAULT]
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...
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verbose = True</programlisting>
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</step>
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</substeps>
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</step>
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<step>
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<para>On the <emphasis>controller</emphasis> node, edit the
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<filename>/etc/nova/nova.conf</filename> file and complete the
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following action:</para>
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<substeps>
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<step>
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<para>In the <literal>[neutron]</literal> section, enable the
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metadata proxy and configure the secret:</para>
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<programlisting language="ini">[neutron]
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...
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service_metadata_proxy = True
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metadata_proxy_shared_secret = <replaceable>METADATA_SECRET</replaceable></programlisting>
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<para>Replace <replaceable>METADATA_SECRET</replaceable> with
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the secret you chose for the metadata proxy.</para>
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</step>
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</substeps>
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</step>
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<step>
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<para>On the <emphasis>controller</emphasis> node, restart the
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Compute <glossterm>API</glossterm> service:</para>
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<screen os="rhel;centos;fedora;sles;opensuse"><prompt>#</prompt> <userinput>systemctl restart openstack-nova-api.service</userinput></screen>
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<screen os="ubuntu;debian"><prompt>#</prompt> <userinput>service nova-api restart</userinput></screen>
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</step>
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</procedure>
|
|
<procedure>
|
|
<title>To configure the Open vSwitch (OVS) service</title>
|
|
<para>The OVS service provides the underlying virtual networking
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framework for instances. The integration bridge
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<literal>br-int</literal> handles internal instance network
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traffic within OVS. The external bridge <literal>br-ex</literal>
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handles external instance network traffic within OVS. The
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external bridge requires a port on the physical external network
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interface to provide instances with external network access. In
|
|
essence, this port connects the virtual and physical external
|
|
networks in your environment.</para>
|
|
<step os="rhel;centos;fedora;sles;opensuse">
|
|
<para>Start the OVS service and configure it to start when the
|
|
system boots:</para>
|
|
<screen><prompt>#</prompt> <userinput>systemctl enable openvswitch.service</userinput>
|
|
<prompt>#</prompt> <userinput>systemctl start openvswitch.service</userinput></screen>
|
|
</step>
|
|
<step os="debian;ubuntu">
|
|
<para>Restart the OVS service:</para>
|
|
<screen><prompt>#</prompt> <userinput>service openvswitch-switch restart</userinput></screen>
|
|
</step>
|
|
<step>
|
|
<para>Add the external bridge:</para>
|
|
<screen><prompt>#</prompt> <userinput>ovs-vsctl add-br br-ex</userinput></screen>
|
|
</step>
|
|
<step>
|
|
<para>Add a port to the external bridge that connects to the
|
|
physical external network interface:</para>
|
|
<para>Replace <replaceable>INTERFACE_NAME</replaceable> with the
|
|
actual interface name. For example, <emphasis>eth2</emphasis>
|
|
or <emphasis>ens256</emphasis>.</para>
|
|
<screen><prompt>#</prompt> <userinput>ovs-vsctl add-port br-ex <replaceable>INTERFACE_NAME</replaceable></userinput></screen>
|
|
<note>
|
|
<para>Depending on your network interface driver, you may need
|
|
to disable <glossterm>generic receive offload
|
|
(GRO)</glossterm> to achieve suitable throughput between
|
|
your instances and the external network.</para>
|
|
<para>To temporarily disable GRO on the external network
|
|
interface while testing your environment:</para>
|
|
<screen><prompt>#</prompt> <userinput>ethtool -K <replaceable>INTERFACE_NAME</replaceable> gro off</userinput></screen>
|
|
</note>
|
|
</step>
|
|
</procedure>
|
|
<procedure>
|
|
<title>To finalize the installation</title>
|
|
<step os="rhel;centos;fedora">
|
|
<para>The Networking service initialization scripts expect a
|
|
symbolic link <filename>/etc/neutron/plugin.ini</filename>
|
|
pointing to the ML2 plug-in configuration file,
|
|
<filename>/etc/neutron/plugins/ml2/ml2_conf.ini</filename>.
|
|
If this symbolic link does not exist, create it using the
|
|
following command:</para>
|
|
<screen><prompt>#</prompt> <userinput>ln -s /etc/neutron/plugins/ml2/ml2_conf.ini /etc/neutron/plugin.ini</userinput></screen>
|
|
<para>Due to a packaging bug, the Open vSwitch agent initialization
|
|
script explicitly looks for the Open vSwitch plug-in configuration
|
|
file rather than a symbolic link
|
|
<filename>/etc/neutron/plugin.ini</filename> pointing to the ML2
|
|
plug-in configuration file. Run the following commands to resolve this
|
|
issue:</para>
|
|
<screen><prompt>#</prompt> <userinput>cp /usr/lib/systemd/system/neutron-openvswitch-agent.service \
|
|
/usr/lib/systemd/system/neutron-openvswitch-agent.service.orig</userinput>
|
|
<prompt>#</prompt> <userinput>sed -i 's,plugins/openvswitch/ovs_neutron_plugin.ini,plugin.ini,g' \
|
|
/usr/lib/systemd/system/neutron-openvswitch-agent.service</userinput></screen>
|
|
</step>
|
|
<step os="sles;opensuse">
|
|
<para>The Networking service initialization scripts expect the
|
|
variable <literal>NEUTRON_PLUGIN_CONF</literal> in the
|
|
<filename>/etc/sysconfig/neutron</filename> file to
|
|
reference the ML2 plug-in configuration file. Edit the
|
|
<filename>/etc/sysconfig/neutron</filename> file and add the
|
|
following:</para>
|
|
<programlisting>NEUTRON_PLUGIN_CONF="/etc/neutron/plugins/ml2/ml2_conf.ini"</programlisting>
|
|
</step>
|
|
<step os="rhel;centos;fedora">
|
|
<para>Start the Networking services and configure them to start
|
|
when the system boots:</para>
|
|
<screen><prompt>#</prompt> <userinput>systemctl enable neutron-openvswitch-agent.service neutron-l3-agent.service \
|
|
neutron-dhcp-agent.service neutron-metadata-agent.service \
|
|
neutron-ovs-cleanup.service</userinput>
|
|
<prompt>#</prompt> <userinput>systemctl start neutron-openvswitch-agent.service neutron-l3-agent.service \
|
|
neutron-dhcp-agent.service neutron-metadata-agent.service</userinput></screen>
|
|
<note>
|
|
<para>Do not explicitly start the
|
|
<systemitem class="service">neutron-ovs-cleanup</systemitem>
|
|
service.</para>
|
|
</note>
|
|
</step>
|
|
<step os="sles;opensuse">
|
|
<para>Start the Networking services and configure them to start
|
|
when the system boots:</para>
|
|
<screen><prompt>#</prompt> <userinput>systemctl enable openstack-neutron-openvswitch-agent.service openstack-neutron-l3-agent.service \
|
|
openstack-neutron-dhcp-agent.service openstack-neutron-metadata-agent.service \
|
|
openstack-neutron-ovs-cleanup.service</userinput>
|
|
<prompt>#</prompt> <userinput>systemctl start openstack-neutron-openvswitch-agent.service openstack-neutron-l3-agent.service \
|
|
openstack-neutron-dhcp-agent.service openstack-neutron-metadata-agent.service</userinput></screen>
|
|
<note>
|
|
<para>Do not explicitly start the
|
|
<systemitem class="service">neutron-ovs-cleanup</systemitem>
|
|
service.</para>
|
|
</note>
|
|
</step>
|
|
<step os="ubuntu;debian">
|
|
<para>Restart the Networking services:</para>
|
|
<screen><prompt>#</prompt> <userinput>service neutron-plugin-openvswitch-agent restart</userinput>
|
|
<prompt>#</prompt> <userinput>service neutron-l3-agent restart</userinput>
|
|
<prompt>#</prompt> <userinput>service neutron-dhcp-agent restart</userinput>
|
|
<prompt>#</prompt> <userinput>service neutron-metadata-agent restart</userinput></screen>
|
|
</step>
|
|
</procedure>
|
|
<procedure>
|
|
<title>Verify operation</title>
|
|
<note>
|
|
<para>Perform these commands on the controller node.</para>
|
|
</note>
|
|
<step>
|
|
<para>Source the <literal>admin</literal> credentials to gain access to
|
|
admin-only CLI commands:</para>
|
|
<screen><prompt>$</prompt> <userinput>source admin-openrc.sh</userinput></screen>
|
|
</step>
|
|
<step>
|
|
<para>List agents to verify successful launch of the
|
|
neutron agents:</para>
|
|
<screen><prompt>$</prompt> <userinput>neutron agent-list</userinput>
|
|
<computeroutput>+--------------------------------------+--------------------+---------+-------+----------------+---------------------------+
|
|
| id | agent_type | host | alive | admin_state_up | binary |
|
|
+--------------------------------------+--------------------+---------+-------+----------------+---------------------------+
|
|
| 30275801-e17a-41e4-8f53-9db63544f689 | Metadata agent | network | :-) | True | neutron-metadata-agent |
|
|
| 4bd8c50e-7bad-4f3b-955d-67658a491a15 | Open vSwitch agent | network | :-) | True | neutron-openvswitch-agent |
|
|
| 756e5bba-b70f-4715-b80e-e37f59803d20 | L3 agent | network | :-) | True | neutron-l3-agent |
|
|
| 9c45473c-6d6d-4f94-8df1-ebd0b6838d5f | DHCP agent | network | :-) | True | neutron-dhcp-agent |
|
|
+--------------------------------------+--------------------+---------+-------+----------------+---------------------------+</computeroutput></screen>
|
|
</step>
|
|
</procedure>
|
|
</section>
|