cadd25e9bc
Import the following documents from the admin guide [1]: - cli-manage-flavors.rst - cli-nova-evacuate.rst - cli-nova-manage-projects-security.rst - cli-nova-manage-services.rst - cli-nova-numa-libvirt.rst - cli-nova-specify-host.rst - cli-set-quotas.rst - cli-set-compute-quotas.rst - cli-os-migrate.rst - cli-os-migrate-cfg-ssh.rst - ts-no-emulator-x86-64.rst - ts-multipath-warn.rst - ts-failed-connect-vol-FC-SAN.rst - ts-failed-attach-vol-no-sysfsutils.rst - ts-failed-attach-vol-after-detach.rst - ts-vol-attach-miss-sg-scan.rst These were missed in the original import [2]. All 'ts-' files are merged into a single 'support-compute' document, which is already in-tree. [1] https://github.com/openstack/openstack-manuals/tree/stable/ocata/doc/admin-guide/source [2] https://review.openstack.org/#/c/477497/ Change-Id: Ifa0039e270e54ea2fb58ab18ce6724e5e8e061a1 Closes-Bug: #1708666
50 lines
1.9 KiB
ReStructuredText
50 lines
1.9 KiB
ReStructuredText
==================
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Evacuate instances
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==================
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If a hardware malfunction or other error causes a cloud compute node to fail,
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you can evacuate instances to make them available again. You can optionally
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include the target host on the :command:`nova evacuate` command. If you omit
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the host, the scheduler chooses the target host.
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To preserve user data on the server disk, configure shared storage on the
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target host. When you evacuate the instance, Compute detects whether shared
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storage is available on the target host. Also, you must validate that the
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current VM host is not operational. Otherwise, the evacuation fails.
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#. To find a host for the evacuated instance, list all hosts:
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.. code-block:: console
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$ openstack host list
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#. Evacuate the instance. You can use the ``--password PWD`` option to pass the
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instance password to the command. If you do not specify a password, the
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command generates and prints one after it finishes successfully. The
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following command evacuates a server from a failed host to ``HOST_B``.
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.. code-block:: console
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$ nova evacuate EVACUATED_SERVER_NAME HOST_B
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The command rebuilds the instance from the original image or volume and
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returns a password. The command preserves the original configuration, which
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includes the instance ID, name, uid, IP address, and so on.
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.. code-block:: console
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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 Compute with
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a shared file system. To configure your system, see
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:ref:`section_configuring-compute-migrations`. The following example does
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not change the password.
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.. code-block:: console
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$ nova evacuate EVACUATED_SERVER_NAME HOST_B --on-shared-storage
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