How to launch multiple EC2 hosts using ansible

[Love]

Dear Experts,

How to launch multiple EC2 instances using ansible?

I want to create an environment in AWS using below playbook but I see only one instance is being created when I execute below playbook.

Could you please help with missing code/syntax here?

Note: I'm using free account with AWS.

---

- name: Create sandbox instances

  hosts: localhost

  gather_facts: True

  vars:

    aws_access_key: aabbccddeeffgghh

    aws_secret_key: aabbccddeeffgghhiijjkkllmmnnoopp

    key_name: mykeypair

    count: 5

    exact_count: 'count_tag'

    instance_type: 't2.micro'

    security_group: my_securitygroup

    group: default

    image: ami-00125160

    ec2_url: https://ec2.us-west-2.amazonaws.com

  tasks:

    - name: Launch instance

      ec2:

         aws_access_key: "{{ aws_access_key }}"

         aws_secret_key: "{{ aws_secret_key }}"

         key_name: "{{ key_name }}"

         group: "{{ security_group }}"

         instance_type: "{{ instance_type }}"

         count_tag: "{{ exact_count }}"

         image: "{{ image }}"

         wait: true

         ec2_url: "{{ ec2_url }}"

         vpc_subnet_id: subnet-edcf00db

         assign_public_ip: yes

      register: ec2

    - name: Add new instance to host group

      add_host:

        hostname: "{{ item.public_ip }}"

        groupname: launched

      with_items: "{{ ec2.instances }}"

    - name: Wait for SSH to come up

      wait_for:

        host: "{{ item.public_dns_name }}"

        port: 22

        delay: 60

   timeout: 320

        state: started

      with_items: "{{ ec2.instances }}"

[Will McDonald]

I think this is because you've defined the desired count in your vars but not actually in the invocation of the ec2 module.

Something like this should work as you expect:

- name: create webserver instances
  hosts: localhost
  connection: local
  gather_facts: false

  vars:
    ec2_instance_count: 2
    ec2_instance_tag:
      name: webserver

  tasks:
    - name: provision ec2 webserver instances

      ec2:
        aws_access_key: "{{ aws_access_key }}"
        aws_secret_key: "{{ aws_secret_key }}"

        count_tag: "{{ ec2_instance_tag }}"
        ec2_url: "{{ ec2_url }}"
        exact_count: "{{ ec2_instance_count }}"
        groups: "{{ ec2_security_group }}"
        key_name: "{{ ec2_key_name }}"
        image: "{{ ec2_image }}"
        instance_tags: "{{ ec2_instance_tag }}"
        instance_type: "{{ ec2_instance_type }}"
        region: "{{ ec2_region }}"
        wait: true
      register: ec2

Cheers,

Will.

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[Saikrishna]

Hi Will,

Updated changes but see an error, could you please let me know what is missing? Inserted code for your reference.

fatal: [localhost]: FAILED! => {"changed": false, "msg": "argument instance_tags is of type <type 'str'> and we were unable to convert to dict: dictionary requested, could not parse JSON or key=value"}

---

- name: Create a sandbox instance

  hosts: localhost

  connection: local

  gather_facts: True

  vars:

    aws_access_key: aabbccdd

    aws_secret_key: aabbccddeeffgghhiijjkk

    key_name: mykeypair

    ec2_instance_count: 5

    ec2_instance_tag:

     name:webserver

    instance_type: 't2.micro'

#    instance_type: 'c4.2xlarge'

    security_group: my_securitygroup

    group: default

    image: ami-00000000

#    region: us-west-2a

    ec2_url: https://ec2.us-west-2.amazonaws.com

  tasks:

    - name: Launch instance

      ec2:

         aws_access_key: "{{ aws_access_key }}"

         aws_secret_key: "{{ aws_secret_key }}"

         count_tag: "{{ ec2_instance_tag }}"

         ec2_url: "{{ ec2_url }}"

         exact_count: "{{ ec2_instance_count }}"

         group: "{{ security_group }}"

         key_name: "{{ key_name }}"

         image: "{{ image }}"

         instance_type: "{{ instance_type }}"

         instance_tags: "{{ ec2_instance_tag }}"

         wait: true

#         region: "{{ region }}"

         vpc_subnet_id: subnet-buiuuyyt

#         vpc_id: vpc-iuuytgfxds

         assign_public_ip: yes

      register: ec2

    - name: Add new instance to host group

      add_host:

        hostname: "{{ item.public_ip }}"

        groupname: launched

      with_items: "{{ ec2.instances }}"

    - name: Wait for SSH to come up

      wait_for:

        host: "{{ item.public_dns_name }}"

        port: 22

        delay: 60

        timeout: 320

        state: started

      with_items: "{{ ec2.instances }}"

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[Will McDonald]

Your ec2_instance_tag 'name:webserver' is being evaluated as a string because there's no space, it needs to be a YAML dictionary.

If you read the docs on the module (ansible-doc ec2), they state:

- instance_tags
        a hash/dictionary of tags to add to the new instance or for starting/stopping instance by tag; '{"key":"value"}' and
        '{"key":"value","key":"value"}'
        [Default: None]
        version_added: 1.0

And if you pay attention to: http://docs.ansible.com/ansible/latest/reference_appendices/YAMLSyntax.html

A dictionary is represented in a simple key: value form (the colon must be followed by a space):

You have:

    ec2_instance_tag:
     name:webserver

This should be:

    ec2_instance_tag:
     name: webserver
          ^

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[Love]

That worked, thank you Will.

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