[config-ref] Added Config Options and Known Issues for Xen+Libvirt
In particular I added the following: - The recommended libvirt version = 1.3.2 or newer - Additional config options: New section on libguestfs file injection - New Known issues: Live migration and live migration monitoring - Use sentence-case capitalization in headlines - Consistently spell libvirt in lowercase Change-Id: Ied485cec8033612b237f2f8e5f19e742b2a6ac7a Closes-Bug: #1548403
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Lars Kurth
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===============
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Xen via Libvirt
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Xen via libvirt
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===============
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OpenStack Compute supports the Xen Project Hypervisor (or Xen). Xen can be
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@ -11,22 +11,23 @@ This section describes how to set up OpenStack Compute with Xen and libvirt.
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For information on how to set up Xen with XAPI refer to
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:doc:`hypervisor-xen-api`.
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Installing Xen with Libvirt
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Installing Xen with libvirt
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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At this stage we recommend using the baseline that we use for the
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`Xen Project OpenStack CI Loop <http://wiki.xenproject.org/wiki/
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OpenStack_CI_Loop_for_Xen-Libvirt>`_, which contains the most recent
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stability fixes to both Xen and Libvirt.
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stability fixes to both Xen and libvirt.
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`Xen 4.5.1 <http://www.xenproject.org/downloads/xen-archives/xen-45-series/
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xen-451.html>`_ (or newer) and `Libvirt 1.2.15 <http://libvirt.org/sources/>`_
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(or newer) contain the most recent OpenStack improvements for Xen.
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xen-451.html>`_ (or newer) and `libvirt 1.2.15 <http://libvirt.org/sources/>`_
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(or newer) contain the minimum required OpenStack improvements for Xen.
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Although libvirt 1.2.15 works with Xen, libvirt 1.3.2 or newer is recommended.
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The necessary Xen changes have also been backported to the Xen 4.4.3 stable
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branch (not yet released at this stage). Please check with the Linux and
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FreeBSD distros you are intending to use as `Dom 0 <http://wiki.xenproject.org/
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wiki/Category:Host_Install>`_, whether the relevant version of Xen and
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Libvirt are available as installable packages.
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branch. Please check with the Linux and FreeBSD distros you are intending to
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use as `Dom 0 <http://wiki.xenproject.org/wiki/Category:Host_Install>`_,
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whether the relevant version of Xen and libvirt are available as installable
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packages.
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The latest releases of Xen and libvirt packages that fulfil the above
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minimum requirements for the various openSUSE distributions can always be
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@ -34,7 +35,7 @@ found and installed from the `Open Build Service <https://build.opensuse.org/
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project/show/Virtualization>`_ Virtualization project.
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To install these latest packages, add the Virtualization repository to your
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software management stack and get the newest packages from there.
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More information about the latest Xen and Libvirt packages are available
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More information about the latest Xen and libvirt packages are available
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`here <https://build.opensuse.org/package/show/Virtualization/xen>`__ and
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`here <https://build.opensuse.org/package/show/Virtualization/libvirt>`__.
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@ -52,7 +53,7 @@ For further information and latest developments, you may want to consult
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the Xen Project's `mailing lists for OpenStack related issues and questions
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<http://lists.xenproject.org/cgi-bin/mailman/listinfo/wg-openstack>`_.
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Configuring Xen with Libvirt
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Configuring Xen with libvirt
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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To enable Xen via libvirt, ensure the following options are set in
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@ -70,7 +71,7 @@ Additional configuration options
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Use the following as a guideline for configuring Xen for use in OpenStack:
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#. **Dom0 Memory**: Set it between 1GB and 4GB by adding the following
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#. **Dom0 memory**: Set it between 1GB and 4GB by adding the following
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parameter to the Xen Boot Options in the `grub.conf <http://
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xenbits.xen.org/docs/unstable/misc/xen-command-line.html>`_ file.
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@ -150,13 +151,13 @@ Use the following as a guideline for configuring Xen for use in OpenStack:
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The default for virtualization mode in nova is PV mode.
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#. **Image Formats**: Xen supports raw, qcow2 and vhd image formats.
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#. **Image formats**: Xen supports raw, qcow2 and vhd image formats.
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For more information on image formats, refer to the `OpenStack Virtual
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Image Guide <http://docs.openstack.org/image-guide/introduction.html>`__
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and the `Storage Options Guide on the Xen Project Wiki
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<http://wiki.xenproject.org/wiki/Storage_options>`_.
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#. **Image Metadata**: In addition to the ``vm_mode`` property discussed
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#. **Image metadata**: In addition to the ``vm_mode`` property discussed
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above, the ``hypervisor_type`` property is another important component
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of the image metadata, especially if your cloud contains mixed hypervisor
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compute nodes. Setting the ``hypervisor_type`` property allows the nova
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@ -178,13 +179,23 @@ Use the following as a guideline for configuring Xen for use in OpenStack:
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`OpenStack Virtual Image Guide <http://docs.openstack.org/image-guide/
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image-metadata.html>`__.
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#. **Libguestfs file injection**: OpenStack compute nodes can use `libguestfs
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<http://libguestfs.org/>`_ to inject files into an instance's image prior
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to launching the instance. libguestfs uses libvirt's QEMU driver to start a
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qemu process, which is then used to inject files into the image. When using
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libguestfs for file injection, the compute node must have the libvirt qemu
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driver installed, in addition to the Xen driver. In RPM based distributions,
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the qemu driver is provided by the ``libvirt-daemon-qemu`` package. In
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Debian and Ubuntu, the qemu driver is provided by the ``libvirt-bin``
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package.
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To customize the libvirt driver, use the configuration option settings
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documented in :ref:`nova-xen`.
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Troubleshoot Xen with Libvirt
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Troubleshoot Xen with libvirt
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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**Important Log Files**: When an instance fails to start, or when you come
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**Important log files**: When an instance fails to start, or when you come
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across other issues, you should first consult the following log files:
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* ``/var/log/nova/compute.log``
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@ -207,9 +218,27 @@ Reporting_Bugs_against_Xen>`_ against Xen.
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Known issues
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~~~~~~~~~~~~
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Xen via libvirt is currently only supported with nova-network.
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Fixes for a number of bugs are currently being worked on to make sure
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that Xen via libvirt will also work with Networking service.
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* **Networking**: Xen via libvirt is currently only supported with
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nova-network. Fixes for a number of bugs are currently being worked on to
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make sure that Xen via libvirt will also work with OpenStack Networking
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(neutron).
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* **Live migration**: Live migration is supported in the libvirt libxl driver
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since version 1.2.5. However, there were a number of issues when used with
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OpenStack, in particular with libvirt migration protocol compatibility. It
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is worth mentioning that libvirt 1.3.0 addresses most of these issues.
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We do however recommend using libvirt 1.3.2, which is fully supported and
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tested as part of the Xen Project CI loop. It addresses live migration
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monitoring related issues and adds support for peer-to-peer migration mode,
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which nova relies on.
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* **Live migration monitoring**: On compute nodes running Kilo or later, live
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migration monitoring relies on libvirt APIs that are only implemented from
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libvirt version 1.3.1 onwards. When attempting to live migrate, the migration
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monitoring thread would crash and leave the instance state as "MIGRATING". If
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you experience such an issue and you are running on a version released before
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libvirt 1.3.1, make sure you backport libvirt commits ad71665 and b7b4391
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from upstream.
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Additional information and resources
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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