play-vm-migration-02-migrate-backend-box.yml

---
- name: "Pick appropriate groups for localhost"
  hosts: localhost
  connection: local
  gather_facts: false
  tasks:
    - import_tasks: tasks/localhost-group-placement.yml
  tags: always

- name: "Unmount temp volume from the new machine"
  hosts: "backend:&next:&{{ copr_instance }}"
  remote_user: root
  tags: unmount_temp_storage
  tasks:
    - import_tasks: tasks/assert-instance-id.yml
      vars:
        instance_id: "{{ backend.new_instance_id }}"

    - name: stop services touching the result directory
      import_tasks: tasks/stop-backend-services.yml

    - name: assert that we are not umounting volume group or raid
      shell: mount | grep {{ backend_storage_mount }} | grep -e md -e mapper && exit 1 || true
      changed_when: false

    - name: umount the temporary mountpoint
      ansible.posix.mount:
        path: "{{ backend_storage_mount }}"
        state: unmounted

# =========================

- name: "Detach the temporary volume from the new instance"
  hosts: localhost
  connection: local
  tags: detach_temp_storage
  tasks:
    - name: detach the temp volumes from the new instance
      amazon.aws.ec2_vol:
        profile: fedora-copr
        instance: None  # None here means detach.
        id: "{{ backend.temp_volume }}"

# =========================

- name: "evacuate the old machine"
  hosts: "backend:&old:&{{ copr_instance }}"
  remote_user: root
  tasks:
    - import_tasks: tasks/assert-instance-id.yml
      vars:
        instance_id: "{{ backend.old_instance_id }}"

    - name: assert we are umounting volume group
      shell: mount | grep {{ backend_storage_mount }} | grep mapper
      changed_when: false

    - name: stop all services on the old machine
      import_tasks: tasks/stop-backend-services.yml
      vars:
        stop_all_services: true

    - name: umount the result dir
      ansible.posix.mount:
        path: "{{ backend_storage_mount }}"
        state: unmounted

    - name: deactivate volume group hosting the results
      community.general.lvg:
        state: inactive
        vg: copr-backend-data

    - name: stop mds - this task sleeps 30m - check and kill manually
      shell: |
        mdadm --stop "/dev/md/{{ item }}"
        sync
      loop:
        - "2ndraid{% if copr_instance == 'dev' %}-dev{% endif %}_0"
        - copr-backend-data_0

    - pause:
        prompt: "Please check /proc/mdstat and hit ENTER"

# =========================

- name: "detach volumes from the old instance"
  hosts: localhost
  connection: local
  tasks:
    - name: requesting copr backend volume snapshots
      include_tasks: tasks/create-snapshots-backend.yml
      vars:
        snapshot_suffix: "clean"

    # NEVER EVER EVER use state=absent, that deletes the volume
    - name: detach volumes from the old instance
      amazon.aws.ec2_vol:
        profile: fedora-copr
        state: present
        # None here means "detach"
        instance: None
        id: "{{ item.value }}"
      loop: "{{ backend.volumes | dict2items }}"
  tags:
    - detach_old_instance

# =========================

- name: "Attach resources to the new instance"
  hosts: localhost
  connection: local
  tags: move_stuff_to_new_instance

  tasks:
    - name: disassociate the elastic IP from the old device
      community.aws.ec2_eip:
        profile: fedora-copr
        device_id: "{{ backend.old_network_id }}"
        ip: "{{ backend.elastic_ip }}"
        in_vpc: true
        state: absent

    - name: associate the elastic IP with a new device
      community.aws.ec2_eip:
        profile: fedora-copr
        device_id: "{{ backend.new_network_id }}"
        ip: "{{ backend.elastic_ip }}"
        in_vpc: true
        state: present

    - name: attach volumes to the new instance
      amazon.aws.ec2_vol:
        profile: fedora-copr
        instance: "{{ backend.new_instance_id }}"
        id: "{{ item.value }}"
        device_name: "{{ item.key }}"
        state: present
      loop: "{{ backend.volumes | dict2items }}"

    - name: reassign ipv6 address
      import_tasks: tasks/reassign-ipv6.yml
      vars:
        ipv6: "{{ backend.ipv6 }}"
        old_eni: "{{ backend.old_network_id }}"
        new_eni: "{{ backend.new_network_id }}"