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47 lines
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========================================
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Configure high availability of instances
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========================================
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As of September 2016, the OpenStack High Availability community is
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designing and developing an official and unified way to provide high
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availability for instances. That is, we are developing automatic
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recovery from failures of hardware or hypervisor-related software on
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the compute node, or other failures which could prevent instances from
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functioning correctly - issues with a cinder volume I/O path, for example.
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More details are available in the `user story
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<http://specs.openstack.org/openstack/openstack-user-stories/user-stories/proposed/ha_vm.html>`_
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co-authored by OpenStack's HA community and `Product Working Group
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<https://wiki.openstack.org/wiki/ProductTeam>`_ (PWG), who have
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identified this feature as missing functionality in OpenStack which
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should be addressed with high priority.
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Existing solutions
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------------------
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The architectural challenges of instance HA and several currently
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existing solutions were presented in `a talk at the Austin summit
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<https://www.openstack.org/videos/video/high-availability-for-pets-and-hypervisors-state-of-the-nation>`_,
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for which `slides are also available
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<http://aspiers.github.io/openstack-summit-2016-austin-compute-ha/>`_.
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The code for three of these solutions can be found online:
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* `a mistral-based auto-recovery workflow
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<https://github.com/gryf/mistral-evacuate>`_, by Intel
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* `masakari <https://launchpad.net/masakari>`_, by NTT
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* `OCF RAs
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<http://aspiers.github.io/openstack-summit-2016-austin-compute-ha/#/ocf-pros-cons>`_,
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as used by Red Hat and SUSE
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Current upstream work
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---------------------
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Work is in progress on a unified approach, which combines the best
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aspects of existing upstream solutions. More details are available on
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`the HA VMs user story wiki
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<https://wiki.openstack.org/wiki/ProductTeam/User_Stories/HA_VMs>`_.
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To get involved with this work, please see the section on the
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:doc:`ha-community`.
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