How to do it…

Let's start by creating an ELB. We will need to add the ELB to a security group. We also need to provide the region and subnet in which we want to create the ELB. We will make this ELB serve HTTP requests on port 80 and route the requests to port 80 of the instance:

- name: Create ELB in public subnet
  ec2_elb_lb:
    state: present
    name: "{{ elb_name }}"
    security_group_ids: "{{ my_first_sg.group_id }}"
    region: "{{ aws_region }}"
    subnets: "{{ my_public_subnet.subnet.id }}"
    aws_access_key: "{{ access_key }}"
    aws_secret_key: "{{ secret_key }}"
    purge_subnets: yes
    listeners:
    - protocol: http
      load_balancer_port: 80
      instance_port: 80
  register: my_first_elb
  tags:
    - elb
    - recipe8

Once our ELB is set up, we need to identify the instances that we are going to attach to the ELB. One way to do so is by filtering the instance with a tag:

- name: Get all ec2 instances with given tags
  ec2_instance_facts:
    aws_access_key: "{{ access_key }}"
    aws_secret_key: "{{ secret_key }}"
    aws_region: "{{ aws_region }}"
    filters:
      "tag:Name": Public Instance
  register: ec2_instances_public
  tags:
    - elb
    - recipe8

Now that we have the instance(s) that we want to attach with the ELB, let's go ahead and attach them for real. The variable ec2_instances_public holds the details of the instances which we got by using the filter:

- name: Register all public instances with elb created
  ec2_elb:
    instance_id: "{{ item.id }}"
    ec2_elbs: "{{ my_first_elb.elb.name }}"
    state: present
    aws_access_key: "{{ access_key }}"
    aws_secret_key: "{{ secret_key }}"
    aws_region: "{{ aws_region }}" 
  with_items:
    - "{{ ec2_instances_public.instances }}"
  ignore_errors: yes
  tags:
    - elb
    - recipe8

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Ansible 2 Cloud Automation Cookbook

How to do it…