Reviewing playbook and role
Let's jump right into examining the role we created, named instance-migrate. The completed role and file, named main.yml, located in the instance-migrate/tasks directory, looks like this:
---
- name: Retrieve hypervisor list
shell: openstack --os-cloud="{{ CLOUD_NAME }}"
hypervisor list | awk 'NR > 3' | awk '$4 != "{{ desthype }}" { print $4 }'
register: hypelist
- name: Collect pre-migration instance details
shell: openstack --os-cloud="{{ CLOUD_NAME }}"
server list --name "{{ instance }}" --long | awk 'NR > 3' | awk '{ print $16 }'
register: preinststat
- name: Disable unselected hypervisors
command: nova "{{ AUTH_S }}"
service-disable "{{ item }}" nova-compute --reason '{{ migreason }}'
with_items: "{{hypelist.stdout_lines}}"
- name: Migrate instance
command: openstack --os-cloud="{{ CLOUD_NAME }}"
server...
