20f780cd61
There are several instances of "Compute Service" and "compute service" in the upstream documentation. As was recently clarified in the docs mailing list, these should be "Compute service/s". This patch corrects all untagged instances inside normal <para> blocks. Change-Id: Idcd7aafa0ce463e70635cb1c883a2476c1d97b5e Partial-Bug: #1217503
243 lines
14 KiB
XML
243 lines
14 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" version="5.0"
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xml:id="nova-compute">
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<title>Configure a compute node</title>
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<para>After you configure the Compute service on the controller
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node, you must configure another system as a compute node. The
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compute node receives requests from the controller node and hosts
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virtual machine instances. You can run all services on a single
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node, but the examples in this guide use separate systems. This
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makes it easy to scale horizontally by adding additional Compute
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nodes following the instructions in this section.</para>
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<para>The Compute service relies on a hypervisor to run virtual
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machine instances. OpenStack can use various hypervisors, but this
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guide uses KVM.</para>
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<procedure>
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<step>
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<para>Configure the system. Use the instructions in <xref
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linkend="ch_basics"/>, but note the following differences
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from the controller node:</para>
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<itemizedlist>
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<listitem>
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<para>Use different IP addresses when you configure
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<filename>eth0</filename>. This guide uses
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<literal>192.168.0.11</literal> for the internal
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network. Do not configure <literal>eth1</literal> with a
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static IP address. The networking component of OpenStack
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assigns and configures an IP address.</para>
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</listitem>
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<listitem>
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<para>Set the host name to <literal>compute1</literal>. To
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verify, use the <code>uname -n</code> parameter. Ensure
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that the IP addresses and host names for both nodes are
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listed in the <filename>/etc/hosts</filename> file on each
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system.</para>
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</listitem>
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<listitem>
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<para>Synchronize from the controller node. Follow the
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instructions in <xref linkend="basics-ntp"/>.</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
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install the MySQL database server or start the MySQL
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service.</para>
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</listitem>
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<listitem>
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<para>Enable the OpenStack packages for the distribution
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that you are using. See <xref linkend="basics-packages"
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/>.</para>
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</listitem>
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</itemizedlist>
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</step>
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<step>
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<para>After you configure the operating system, install the
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appropriate packages for the Compute service.</para>
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<para os="ubuntu;debian">Run this command:</para>
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<screen os="ubuntu;debian"><prompt>#</prompt> <userinput>apt-get install nova-compute-kvm python-guestfs</userinput></screen>
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<para os="ubuntu;debian">When prompted to create a
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<literal>supermin</literal> appliance, respond
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<userinput>yes</userinput>.</para>
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<note os="debian">
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<para>To use the meta-packages and install other components on
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your compute node, such as OVS Networking and Ceilometer
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agents, run this command:</para>
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<screen><prompt>#</prompt> <userinput>apt-get install openstack-compute-node</userinput></screen>
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<para>The controller node has the
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<package>openstack-proxy-node</package> and
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<package>openstack-toaster</package> meta-packages that
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install <package>openstack-proxy-node</package> and
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<package>openstack-toaster</package> at the same
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time.</para>
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</note>
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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="debian">
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<para>Respond to the prompts for <link
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linkend="debconf-dbconfig-common">database
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management</link>, <link linkend="debconf-keystone_authtoken"
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><literal>[keystone_authtoken]</literal> settings</link>,
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<link linkend="debconf-rabbitqm">RabbitMQ
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credentials</link>, and <link linkend="debconf-api-endpoints"
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>API endpoint</link> registration.</para>
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</step>
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<step os="ubuntu">
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<para>For security reasons, the Linux kernel is not readable by
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normal users which restricts hypervisor services such as qemu
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and libguestfs. For details, see <link
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xlink:href="https://bugs.launchpad.net/ubuntu/+source/linux/+bug/759725"
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>this bug</link>. To make the current kernel readable, run:
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<screen><prompt>#</prompt> <userinput>dpkg-statoverride --update --add root root 0644 /boot/vmlinuz-$(uname -r)</userinput></screen>
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To also enable this override for all future kernel updates, create the
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file <filename>/etc/kernel/postinst.d/statoverride</filename>
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containing:<programlisting language="bash">#!/bin/sh
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version="$1"
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# passing the kernel version is required
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[ -z "${version}" ] && exit 0
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dpkg-statoverride --update --add root root 0644 /boot/vmlinuz-${version}</programlisting>
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Remember to make the file executable:
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<screen><prompt>#</prompt> <userinput>chmod +x /etc/kernel/postinst.d/statoverride</userinput></screen>
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</para>
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</step>
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<step>
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<para os="fedora;rhel;centos;opensuse;sles">Edit the
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<filename>/etc/nova/nova.conf</filename> configuration file:
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</para>
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<screen os="fedora;rhel;centos;opensuse;sles"><prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf 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 keystone_authtoken auth_uri http://<replaceable>controller</replaceable>:5000</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf keystone_authtoken auth_host <replaceable>controller</replaceable></userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf keystone_authtoken auth_protocol http</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf keystone_authtoken auth_port 35357</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf keystone_authtoken admin_user nova</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf keystone_authtoken admin_tenant_name service</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf keystone_authtoken admin_password <replaceable>NOVA_PASS</replaceable></userinput></screen>
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<para os="ubuntu;debian">Edit the
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<filename>/etc/nova/nova.conf</filename> configuration file and add these
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lines 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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[keystone_authtoken]
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auth_uri = http://<replaceable>controller</replaceable>:5000
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auth_host = <replaceable>controller</replaceable>
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auth_port = 35357
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auth_protocol = http
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admin_tenant_name = service
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admin_user = nova
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admin_password = <replaceable>NOVA_PASS</replaceable></programlisting>
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</step>
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<step os="fedora;rhel;centos;ubuntu;opensuse;sles">
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<para os="fedora;rhel;centos">Configure the Compute service to use the
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Qpid message broker by setting these configuration keys:</para>
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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">Configure the Compute service to use
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the RabbitMQ message broker by setting these configuration
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keys in the <literal>[DEFAULT]</literal> configuration group of
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the <filename>/etc/nova/nova.conf</filename> file:</para>
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<programlisting os="ubuntu" language="ini">rpc_backend = nova.rpc.impl_kombu
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rabbit_host = controller
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rabbit_password = <replaceable>RABBIT_PASS</replaceable></programlisting>
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<para os="opensuse;sles">Configure the Compute service to use the RabbitMQ message broker
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by setting these configuration keys:</para>
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<screen os="opensuse;sles"><prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf \
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DEFAULT rpc_backend nova.rpc.impl_kombu</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf DEFAULT rabbit_host controller</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf DEFAULT rabbit_password <replaceable>RABBIT_PASS</replaceable></userinput></screen>
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</step>
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<step>
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<para>Configure Compute to provide remote console access to instances.</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 vnc_enabled True</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf DEFAULT vncserver_listen 0.0.0.0</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf DEFAULT vncserver_proxyclient_address 192.168.0.11</userinput>
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<prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf \
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DEFAULT novncproxy_base_url http://<replaceable>controller</replaceable>:6080/vnc_auto.html</userinput></screen>
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<para os="ubuntu;debian">Edit
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<filename>/etc/nova/nova.conf</filename> and add the following
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keys under the
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<literal>[DEFAULT]</literal>
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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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vnc_enabled=True
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vncserver_listen=0.0.0.0
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vncserver_proxyclient_address=192.168.0.11
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novncproxy_base_url=http://<replaceable>controller</replaceable>:6080/vnc_auto.html</programlisting>
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</step>
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<step>
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<para>Specify the host that runs the Image Service.<phrase
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os="ubuntu;debian"> Edit
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<filename>/etc/nova/nova.conf</filename> file and add
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these lines to the <literal>[DEFAULT]</literal>
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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>
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<para>If you install Compute on a virtual machine for testing
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purposes, you must determine whether your hypervisor and/or CPU
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support nested hardware acceleration using the following
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command:</para>
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<screen><prompt>#</prompt> <userinput>egrep -c '(vmx|svm)' /proc/cpuinfo</userinput></screen>
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<para>If this command returns a value of
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<emphasis>one or greater</emphasis>, your hypervisor and/or CPU
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support nested hardware acceleration which requires no
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additional configuration.</para>
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<para os="ubuntu;debian">If this command returns a value of
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<emphasis>zero</emphasis>, your hypervisor and/or CPU do not
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support nested hardware acceleration and
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<literal>libvirt</literal> must use QEMU instead of KVM. Edit
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the <literal>[libvirt]</literal> section in the
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<filename>/etc/nova/nova-compute.conf</filename> file to modify
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this key:</para>
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<programlisting os="ubuntu;debian" language="ini">[libvirt]
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...
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virt_type = qemu</programlisting>
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<para os="rhel;centos;fedora;sles;opensuse">If this command returns
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a value of <emphasis>zero</emphasis>, your hypervisor and/or CPU
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do not support nested hardware acceleration and
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<literal>libvirt</literal> must use QEMU instead of KVM.
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Configure <literal>libvirt</literal> to use QEMU:</para>
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<screen os="rhel;centos;fedora;sles;opensuse"><prompt>#</prompt> <userinput>openstack-config --set /etc/nova/nova.conf libvirt virt_type qemu</userinput></screen>
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</step>
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<step>
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<para os="fedora;rhel;centos;opensuse;sles">Start the Compute
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service and configure it to start when the system
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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="fedora;rhel;centos"><prompt>#</prompt> <userinput>service libvirtd start</userinput>
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<prompt>#</prompt> <userinput>service messagebus start</userinput>
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<prompt>#</prompt> <userinput>chkconfig libvirtd on</userinput>
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<prompt>#</prompt> <userinput>chkconfig messagebus on</userinput>
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<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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<screen os="opensuse;sles"><prompt>#</prompt> <userinput>service libvirtd start</userinput>
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<prompt>#</prompt> <userinput>chkconfig libvirtd on</userinput>
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<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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<step os="ubuntu">
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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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</procedure>
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</section>
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