Auto-incrementing Integer Assignment to hostnames

[ra...@leaninfotech.net]

Hi ,

  I am trying to provision my aws infrastructure using ansible and i wanted to see if there is a way to include an Auto-incrementing Integer Assignment to Hostvars. For ex:


lets say if i have something like this

- ec2:
    key_name: mykey
    instance_type: t2.micro
    image: ami-123456
    wait: yes
    group: webserver
    count: 3
    vpc_subnet_id: subnet-29e63245
    assign_public_ip: yes



can it create instances with below names ?

  dev-web-01
  dev-web-02
  dev-web-03


Thanks in advance for any help.

[Barry Kaplan]

I too wanted this. In the end I had to do without. It would be awesome if a count variable was exposed for use.

[benno joy]

one way to do this would be:

- ec2:

    key_name: mykey

    instance_type: t2.micro

    image: ami-123456

    wait: yes

    group: webserver

    exact_count: 1

    count_tags:

      Name: "{{ 'dev-web-' + item }}" 

    instance_tags:

      Name: "{{ 'dev-web-' + item }}" 

    vpc_subnet_id: subnet-29e63245

    assign_public_ip: yes

  with_sequence: count=3

On Mon, May 25, 2015 at 7:45 AM, Barry Kaplan <mem...@gmail.com> wrote:

I too wanted this. In the end I had to do without. It would be awesome if a count variable was exposed for use.

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[Barry Kaplan]

Hmm, that might work. I need to spread the instances over the availability zones so I have been setting up something like:

    instances:
      - {subnet: "{{vpc_subnet.private.a}}", count: 3 }
      - {subnet: "{{vpc_subnet.private.b}}", count: 3 }
      - {subnet: "{{vpc_subnet.private.c}}", count: 3 }
      - {subnet: "{{vpc_subnet.private.d}}", count: 1 }


    - name: Create instances
      ec2:
        image: "{{ubuntu_image.ami}}"
        region: "{{ec2_region}}"
        vpc_subnet_id: "{{item.subnet.id}}"
        instance_type: "{{api_proxy_instance_type}}"
        assign_public_ip: false
        group: "{{security_groups}}"
        instance_tags:
          Name: "{{env_prefix}}{{instance_name}}"
          api_proxy: group
          subnet: "{{item.subnet.id}}"
          env: "{{env}}"
          managed_by: ansible
        exact_count: "{{item.count}}"
        count_tag:
          api_proxy: group
          subnet: "{{item.subnet.id}}"
        key_name: "{{aws_key_name}}"
        wait: yes
      register: ec2_proxy
      with_items: instances

I looks like using with sequence and (item % 4) to select the availability zone would then leave the {{item}} to be used a suffix.

I will have to try this. Thanks Benno!