5.9.2. Evacuating all instances on a host

Procedure

1. Log onto the failed Compute node as an administrator.

2. Disable the Compute node:

   (overcloud)[stack@director ~]$ openstack compute service set \
   <host> <service> --disable

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   • Replace <host> with the name of the Compute node to evacuate the instances from.
   • Replace <service> with the name of the service to disable, for example nova-compute.

3. Evacuate all instances on a specified Compute node:

   (overcloud)[stack@director ~]$ nova host-evacuate [--target_host <dest>] [--force] <host>

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   • Replace <dest> with the name of the destination Compute node to evacuate the instances to. If you do not specify the destination, the Compute scheduler selects one for you. You can find possible Compute nodes by using the following command:

     (overcloud)[stack@director ~]$ openstack hypervisor list

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   • Replace <host> with the name of the Compute node to evacuate the instances from.