150 lines
8.6 KiB
XML
150 lines
8.6 KiB
XML
<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="nova-compute">
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<title>Configuring a Compute Node</title>
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<para>After configuring the Compute Services on the controller node, configure a second system to
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be a Compute node. The Compute node receives requests from the controller node and hosts virtual
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machine instances. You can run all services on a single node, but this guide uses separate
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systems. This makes it easy to scale horizontally by adding additional Compute nodes following
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the instructions in this section.</para>
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<para>The Compute Service relies on a hypervisor to run virtual machine
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instances. OpenStack can use various hypervisors, but this guide uses
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KVM.</para>
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<procedure>
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<title>Configure a Compute Node</title>
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<step><para>Begin by configuring the system using the instructions in
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<xref linkend="ch_basics"/>. Note the following differences from the
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controller node:</para>
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<itemizedlist>
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<listitem>
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<para>Use different IP addresses when configuring
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<filename>eth0</filename>. This guide uses
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<literal>192.168.0.11</literal> for the internal network. Change
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or configure <literal>eth1</literal> to manual rather than
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static.</para>
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</listitem>
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<listitem>
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<para>Set the hostname to <literal>compute1</literal>. Ensure that the
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IP addresses and hostnames for both nodes are listed in the
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<filename>/etc/hosts</filename> file on each system.</para>
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</listitem>
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<listitem>
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<para>Follow the instructions in
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<xref linkend="basics-ntp"/> to synchronize from the controller node.</para>
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</listitem>
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<listitem>
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<para>Install the MySQL client libraries. You do not need to install the MySQL database
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server or start the MySQL service.</para>
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</listitem>
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<listitem>
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<para>Enable the OpenStack packages for the distribution you are using, see <xref linkend="basics-packages"/>.</para>
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</listitem>
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</itemizedlist>
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</step>
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<step><para>After configuring the operating system, install the appropriate
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packages for the compute service.</para>
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<screen os="ubuntu;debian"><prompt>#</prompt> <userinput>apt-get install nova-compute-kvm python-novaclient python-guestfs</userinput></screen>
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<para os="ubuntu;debian">Select "Yes" when asked to create a supermin appliance during install.</para>
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<screen os="centos;rhel;fedora"><prompt>#</prompt> <userinput>yum install openstack-nova-compute</userinput></screen>
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<screen os="opensuse;sles"><prompt>#</prompt> <userinput>zypper install openstack-nova-compute kvm openstack-utils</userinput></screen>
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</step>
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<step os="ubuntu">
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<para>Due to <link xlink:href="https://bugs.launchpad.net/ubuntu/+source/linux/+bug/759725">this bug</link>
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that is marked "Won't Fix", guestfs is restricted.
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Run the following command to relax the restriction:</para>
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<screen><prompt>#</prompt> <userinput>chmod 0644 /boot/vmlinuz*</userinput></screen>
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</step>
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<step os="rhel;centos;fedora"><para>Either copy and modify the file <filename>/etc/nova/nova.conf</filename> from the
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<replaceable>controller</replaceable> node, or run the same configuration commands.</para>
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<screen os="fedora;rhel;centos;opensuse;sles"><prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf \
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database connection mysql://nova:<replaceable>NOVA_DBPASS</replaceable>@controller/nova</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf DEFAULT auth_strategy keystone</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf DEFAULT auth_host <replaceable>controller</replaceable></userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf DEFAULT admin_user nova</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf DEFAULT admin_tenant_name service</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf DEFAULT admin_password <replaceable>NOVA_DBPASS</replaceable></userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf \
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database connection mysql://nova:<replaceable>NOVA_DBPASS</replaceable>@controller/nova</userinput>
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</screen>
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<para os="ubuntu;debian">Edit <filename>/etc/nova/nova.conf</filename> and add to the appropriate sections.</para>
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<programlisting os="ubuntu;debian" language="ini">...
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[DEFAULT]
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...
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auth_strategy=keystone
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...
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[database]
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# The SQLAlchemy connection string used to connect to the database
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connection = mysql://nova:NOVA_DBPASS@controller/nova
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</programlisting>
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<screen os="fedora;rhel;centos"><prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf \
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DEFAULT rpc_backend nova.openstack.common.rpc.impl_qpid</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf DEFAULT qpid_hostname <replaceable>controller</replaceable></userinput></screen>
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<para os="ubuntu;debian">
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Configure the Compute Service to use the RabbitMQ
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message broker by setting the following configuration keys. They are found in
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the <literal>DEFAULT</literal> configuration group of the
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<filename>/etc/nova/nova.conf</filename> file.</para>
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<programlisting os="ubuntu;debian" language="ini">rpc_backend = nova.rpc.impl_kombu
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rabbit_host = controller</programlisting>
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</step>
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<step os="ubuntu;debian">
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<para>Remove the SQLite Database created by the packages</para>
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<screen><prompt>#</prompt> <userinput>rm /var/lib/nova/nova.sqlite</userinput></screen>
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</step>
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<step><para>Set the configuration keys <literal>my_ip</literal>,
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<literal>vncserver_listen</literal>, and
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<literal>vncserver_proxyclient_address</literal> to the IP address of the
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compute node on the internal network.</para>
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<screen os="fedora;rhel;centos;opensuse;sles"><prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf DEFAULT my_ip 192.168.0.11</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf DEFAULT vncserver_listen 192.168.0.11</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf DEFAULT vncserver_proxyclient_address 192.168.0.11</userinput></screen>
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<para os="ubuntu;debian">Edit <filename>/etc/nova/nova.conf</filename> and add to the <literal>[DEFAULT]</literal> section.</para>
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<programlisting os="ubuntu;debian" language="ini">[DEFAULT]
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...
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my_ip=192.168.0.11
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vncserver_listen=0.0.0.0
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vncserver_proxyclient_address=192.168.0.11</programlisting>
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</step>
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<step><para>Specify the host running the Image Service.<phrase os="ubuntu;debian"> Edit <filename>/etc/nova/nova.conf</filename> and add to the <literal>[DEFAULT]</literal> section.</phrase></para>
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<screen os="fedora;rhel;centos;opensuse;sles"><prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf DEFAULT glance_host <replaceable>controller</replaceable></userinput></screen>
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<programlisting os="ubuntu;debian" language="ini">[DEFAULT]
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...
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glance_host=<replaceable>controller</replaceable></programlisting>
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</step>
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<step><para>Copy the file <filename>/etc/nova/api-paste.ini</filename> from the
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<replaceable>controller</replaceable> node, or edit the file to add the credentials in the
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<literal>[filter:authtoken]</literal> section.</para>
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<programlisting language="ini">[filter:authtoken]
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paste.filter_factory=keystoneclient.middleware.auth_token:filter_factory
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auth_host=controller
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auth_port = 35357
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auth_protocol = http
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admin_user=nova
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admin_tenant_name=service
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admin_password=<replaceable>NOVA_DBPASS</replaceable>
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</programlisting>
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<note os="fedora;rhel;centos;opensuse;sles"><para>Ensure that <filename>api_paste_config=/etc/nova/api-paste.ini</filename> is set in
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<filename>/etc/nova/nova.conf</filename>.</para></note>
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</step>
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<step>
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<para os="fedora;rhel;centos;opensuse;sles">Start the Compute service and configure it to start when the system boots.</para>
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<para os="ubuntu;debian">Restart the Compute service.</para>
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<screen os="ubuntu;debian"><prompt>#</prompt> <userinput>service nova-compute restart</userinput></screen>
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<screen os="centos;rhel;fedora;opensuse;sles"><prompt>#</prompt> <userinput>service openstack-nova-compute start</userinput>
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<prompt>#</prompt> <userinput>chkconfig openstack-nova-compute on</userinput></screen>
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</step>
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</procedure>
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</section>
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