498dfed60a
1. Files converted: - common/section_compute-configure-console.xml - common/section_compute-configure-vnc.xml - common/section_compute-configure-spice.xml 2. Moved cli_nova_evacuate.rst to the common-rst folder Change-Id: I4963d799ae4f6f5528885aa15c90eeb56ad3322e Implements: blueprint reorganise-user-guides
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==================
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Evacuate instances
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==================
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If a cloud compute node fails due to a hardware malfunction or another
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reason, you can evacuate instances to make them available again. You
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can optionally include the target host on the :command:`evacuate`
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command. If you omit the host, the scheduler determines the target
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host.
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To preserve user data on server disk, you must configure shared
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storage on the target host. Also, you must validate that the current
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VM host is down; otherwise, the evacuation fails with an error.
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#. To list hosts and find a different host for the evacuated instance, run::
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$ nova host-list
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#. Evacuate the instance. You can pass the instance password to the
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command by using the :option:`--password PWD` option. If you do not
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specify a password, one is generated and printed after the command
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finishes successfully. The following command evacuates a server
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without shared storage from a host that is down to the specified
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HOST_B::
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$ nova evacuate EVACUATED_SERVER_NAME HOST_B
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The instance is booted from a new disk, but preserves its
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configuration including its ID, name, uid, IP address, and so on.
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The command returns a password::
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+-----------+--------------+
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| Property | Value |
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+-----------+--------------+
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| adminPass | kRAJpErnT4xZ |
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+-----------+--------------+
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#. To preserve the user disk data on the evacuated server, deploy
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OpenStack Compute with a shared file system. To configure your
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system, see `Configure migrations
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<http://docs.openstack.org/admin-guide-cloud/content/section_configuring-compute-migrations.html>`_
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in OpenStack Cloud Administrator Guide. In the following example,
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the password remains unchanged::
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$ nova evacuate EVACUATED_SERVER_NAME HOST_B --on-shared-storage
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