80 lines
2.5 KiB
ReStructuredText
80 lines
2.5 KiB
ReStructuredText
=================
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Migrate instances
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=================
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When you want to move an instance from one compute host to another, you can use
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the :command:`openstack server migrate` command. The scheduler chooses the
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destination compute host based on its settings. This process does not assume
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that the instance has shared storage available on the target host. If you are
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using SSH tunneling, you must ensure that each node is configured with SSH key
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authentication so that the Compute service can use SSH to move disks to other
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nodes. For more information, see :ref:`cli-os-migrate-cfg-ssh`.
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#. To list the VMs you want to migrate, run:
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.. code-block:: console
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$ openstack server list
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#. Use the :command:`openstack server migrate` command.
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.. code-block:: console
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$ openstack server migrate --live TARGET_HOST VM_INSTANCE
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#. To migrate an instance and watch the status, use this example script:
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.. code-block:: bash
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#!/bin/bash
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# Provide usage
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usage() {
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echo "Usage: $0 VM_ID"
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exit 1
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}
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[[ $# -eq 0 ]] && usage
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# Migrate the VM to an alternate hypervisor
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echo -n "Migrating instance to alternate host"
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VM_ID=$1
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openstack server migrate $VM_ID
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VM_OUTPUT=$(openstack server show $VM_ID)
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VM_STATUS=$(echo "$VM_OUTPUT" | grep status | awk '{print $4}')
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while [[ "$VM_STATUS" != "VERIFY_RESIZE" ]]; do
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echo -n "."
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sleep 2
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VM_OUTPUT=$(openstack server show $VM_ID)
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VM_STATUS=$(echo "$VM_OUTPUT" | grep status | awk '{print $4}')
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done
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nova resize-confirm $VM_ID
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echo " instance migrated and resized."
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echo;
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# Show the details for the VM
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echo "Updated instance details:"
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openstack server show $VM_ID
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# Pause to allow users to examine VM details
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read -p "Pausing, press <enter> to exit."
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.. note::
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If you see the following error, it means you are either running the command
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with the wrong credentials, such as a non-admin user, or the ``policy.json``
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file prevents migration for your user::
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ERROR (Forbidden): Policy doesn't allow compute_extension:admin_actions:migrate to be performed. (HTTP 403)``
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.. note::
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If you see the following error, similar to this message, SSH tunneling was
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not set up between the compute nodes::
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ProcessExecutionError: Unexpected error while running command.
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Stderr: u Host key verification failed.\r\n
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The instance is booted from a new host, but preserves its configuration
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including instance ID, name, IP address, any metadata, and other properties.
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