141 lines
7.9 KiB
XML
141 lines
7.9 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<chapter 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="ch_hypervisors">
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<title>Hypervisors</title>
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<para>This section assumes you have a working installation of OpenStack Compute and want to
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select a particular hypervisor or run with multiple hypervisors. Before you try to get a VM
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running within OpenStack Compute, be sure you have installed a hypervisor and used the
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hypervisor's documentation to run a test VM and get it working.</para>
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<section xml:id="selecting-a-hypervisor">
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<title>Selecting a Hypervisor</title>
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<para>OpenStack Compute supports many hypervisors, an array of which must provide a bit of
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difficulty in selecting a hypervisor unless you are already familiar with one. You
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cannot configure more than one virtualization type on the compute nodes, so the
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hypervisor selection is for the entire installation. These links provide additional
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information for choosing a hypervisor. Refer to <link
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xlink:href="http://wiki.openstack.org/HypervisorSupportMatrix"
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>http://wiki.openstack.org/HypervisorSupportMatrix</link> for a detailed list of
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features and support across the hypervisors. </para>
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<para>Here is a list of the supported hypervisors with links to a relevant web site for
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configuration and use:</para>
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<itemizedlist>
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<listitem><para><link xlink:href="http://www.linux-kvm.org/page/Main_Page">KVM</link> - Kernel-based Virtual
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Machine. The virtual disk formats that it supports it inherits from QEMU since
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it uses a modified QEMU program to launch the virtual machine. The supported
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formats include raw images, the qcow2, and VMware formats. </para></listitem>
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<listitem><para><link xlink:href="http://lxc.sourceforge.net/">LXC</link> - Linux Containers (through
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libvirt), use to run Linux-based virtual machines.</para></listitem>
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<listitem><para><link xlink:href="http://wiki.qemu.org/Manual">QEMU</link> - Quick EMUlator, generally only
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used for development purposes.</para></listitem>
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<listitem><para><link xlink:href="http://user-mode-linux.sourceforge.net/">UML</link> - User Mode Linux,
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generally only used for development purposes. </para></listitem>
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<listitem><para><link xlink:href="http://www.vmware.com/products/vsphere-hypervisor/support.html">VMWare
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ESX/ESXi</link> 4.1 update 1, runs VMWare-based Linux and Windows images
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through a connection with the ESX server.</para></listitem>
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<listitem><para><link xlink:href="http://www.xen.org/support/documentation.html">Xen</link> - XenServer 5.5,
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Xen Cloud Platform (XCP), use to run Linux or Windows virtual machines. You must
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install the nova-compute service on DomU. </para></listitem></itemizedlist>
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</section>
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<section xml:id="hypervisor-configuration-basics"><title>Hypervisor Configuration Basics</title>
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<para>The node where the nova-compute service is installed and running is the machine that
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runs all the virtual machines, referred to as the compute node in this guide. </para>
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<para>By default, the selected hypervisor is KVM. To change to another hypervisor, change
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the --libvirt_type flag in nova.conf and restart the nova-compute service. </para>
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<para>Here are the nova.conf flags that are used to configure the compute node.</para>
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<table rules="all">
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<caption>Description of nova.conf flags for the compute node</caption>
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<thead>
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<tr>
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<td>Flag</td>
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<td>Default</td>
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<td>Description</td>
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</tr>
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</thead>
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<tbody>
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<tr><td>--connection_type</td>
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<td>default: 'libvirt'</td>
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<td>libvirt, xenapi, or fake; Value that indicates the virtualization
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connection type</td></tr>
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<tr>
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<td>--compute_manager</td>
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<td>default: 'nova.compute.manager.ComputeManager'</td>
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<td>String value; Manager to use for nova-compute</td>
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</tr>
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<tr>
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<td>--compute_driver</td>
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<td>default: 'nova.virt.connection.get_connection'</td>
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<td>String value; Driver to use for controlling virtualization</td>
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</tr>
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<tr>
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<td>--images_path</td>
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<td>default: '$state_path/images'</td>
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<td>Directory; Location where decrypted images are stored on disk (when not
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using Glance)</td>
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</tr>
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<tr>
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<td>--instances_path</td>
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<td>default: '$state_path/instances'</td>
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<td>Directory; Location where instances are stored on disk (when not using
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Glance)</td>
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</tr>
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<tr>
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<td>--libvirt_type</td>
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<td>default: 'kvm'</td>
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<td>String; Libvirt domain type (valid options are: kvm, qemu, uml, xen) </td>
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</tr>
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<tr>
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<td>--allow_project_net_traffic</td>
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<td>default: 'true'</td>
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<td>True or false; Indicates whether to allow in-project network traffic </td>
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</tr>
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<tr>
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<td>--firewall_driver</td>
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<td>default: 'nova.virt.libvirt_conn.IptablesFirewallDriver'</td>
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<td>String; Firewall driver for instances, defaults to iptables</td>
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</tr>
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<tr>
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<td>--injected_network_template</td>
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<td>default: ''</td>
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<td>Directory and file name; Template file for injected network
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information</td>
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</tr>
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<tr>
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<td>--libvirt_uri</td>
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<td>default: empty string</td>
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<td>String; Override the default libvirt URI (which is dependent on libvirt_type)</td>
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</tr>
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<tr>
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<td>--libvirt_xml_template</td>
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<td>default: ''</td>
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<td>Directory and file name; Libvirt XML template</td>
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</tr>
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<tr>
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<td>--use_cow_images</td>
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<td>default: 'true'</td>
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<td>True or false; Indicates whether to use cow images</td>
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</tr>
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<tr>
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<td>--rescue_image_id</td>
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<td>default: 'ami-rescue'</td>
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<td>String; AMI image to use for rescue</td>
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</tr>
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<tr>
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<td>--rescue_kernel_id</td>
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<td>default: 'aki-rescue'</td>
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<td>String; AKI image to use for rescue</td>
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</tr>
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<tr>
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<td>--rescue_ramdisk_id</td>
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<td>default: 'ari-rescue'</td>
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<td>String; ARI image to use for rescue</td>
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</tr>
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</tbody></table>
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</section>
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</chapter>
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