Lab 3 - Declarative - Create VS, Pool and Members using an iApp
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You will create a playbook to deploy VS, Pools and associated Members using iApps.

Task 1 - Create service playbook using iApp
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

#. Create a playbook ``iapp.yaml``.

   - Type ``nano playbooks/iapp.yaml``
   - Type the following into the ``playbooks/iapp.yaml`` file.

   .. code:: yaml

      ---

      - name: "Declarative: Deploy / teardown web app"
        hosts: bigips
        gather_facts: False
        connection: local

        vars:
          service_name: ""
          service_ip: ""
          service_group: ""
          state: "present"

        environment: "{{ bigip_env }}"

        tasks:
          - import_tasks: getsl.yaml
            when: state == "absent"

          - name: Check if {{ service_name }} is deployed
            meta: end_play
            when: 'state == "absent" and service_name not in (service_list.content|from_json)["items"]'

          - name: Build POST body
            template: src=f5.http.j2 dest=./f5.http.yaml

          - name: Adjust an iApp
            uri:
              url: "https://{{ inventory_hostname }}/mgmt/tm/cloud/services/iapp/{{ service_name }}"
              method: "{{ (state == 'present') | ternary('POST', 'DELETE') }}"
              body: "{{ (lookup('template','f5.http.yaml') | from_yaml) }}"
              body_format: json
              user: "{{ bigip_user }}"
              password: "{{ bigip_pass }}"
              validate_certs: no


   - :guilabel:`Ctrl-x` to save file.

#. Run this playbook.

   - Type ``ansible-playbook playbooks/iapp.yaml -e @creds.yaml --ask-vault-pass -e service_name="app4" -e service_ip="10.1.10.40" -e service_group="appservers"``

     If successful, you should see similar results

     .. image:: ../images/image011.png
        :height: 180px

     .. HINT:: Due to our lab environment, you may encounter a timeout issue.  
        If so, please run playbook a 2nd time and it should complete correctly.

#. Verify results in BIG-IP GUI.

   .. HINT:: You should see app4 deployed with 1 pool member.  App should be 
      accessible on https://10.1.10.40.

#. Run this playbook to teardown.
#. Verify that app4 iapp should be deleted in BIG-IP GUI.

   - Type ``ansible-playbook playbooks/iapp.yaml -e @creds.yaml --ask-vault-pass -e service_name="app4" -e service_ip="10.1.10.40" -e service_group="appservers" -e state="absent"``

   .. NOTE:: **F5 iApps**, automate the configuration of advanced L4-L7 
      functionality. Deploying an iApp from an Ansible playbook means the
      Ansible admin can deliver advanced L4-L7 services without the requirement
      for F5 domain-specific knowledge.  You take the JSON payload and convert
      to YAML using online tools like http://www.json2yaml.com.