Example of ec2_elb usage re: Issue #3849 (ansible)

upgrade_foo.yml

---
# Deploys a new version of foo
- name: Deploy new version of foo
  hosts: tag_type_appserver:&tag_stage_prod
  user: ubuntu
  sudo: true
  gather_facts: false
  serial: 1

  vars_prompt:
    - name: "foo_version"
      prompt: "Version of foo to be installed?"

  tasks:
    - name: Now processing this instance
      debug: msg='{{ ec2_tag_Name }}'

    - name: Deregister instance from ELB
      local_action:
        module: ec2_elb
        region: us-east-1
        ec2_elbs:
          - APP-ELB
        instance_id: '{{ ec2_id }}'
        state: absent
      sudo: false

    - name: Wait for 1 minutes for requests to stop coming in
      pause: minutes=1

    - name: Remove foo
      apt: pkg=foo state=absent

    - name: Update cache and install specified version of foo
      apt: pkg=foo="{{ foo_version }}" update_cache=yes state=present

    - name: Register instance with ELB
      local_action:
        module: ec2_elb
        region: us-east-1
        ec2_elbs: '{{ ec2_elbs }}'
        instance_id: '{{ ec2_id }}'
        state: present
      sudo: false

    - name: Wait for 30 seconds for instance to register/requests to start coming in
      pause: seconds=30