Launch multiple volumes with ec2 instance using ansible - amazon-web-services

Question

I am provisioning an ec2 instance with number of volumes attached to it. Following is my playbook to do the same.
---
- hosts: localhost
connection: local
gather_facts: false
vars:
instance_type: 't2.micro'
region: 'my-region'
aws_zone: 'myzone'
security_group: my-sg
image: ami-sample
keypair: my-keypair
vpc_subnet_id: my-subnet
tasks:
- name: Launch instance
ec2:
image: "{{ image }}"
instance_type: "{{ instance_type }}"
keypair: "{{ keypair}}"
instance_tags: '{"Environment":"test","Name":"test-provisioning"}'
region: "{{region}}"
aws_zone: "{{ region }}{{ aws_zone }}"
group: "{{ security_group }}"
vpc_subnet_id: "{{vpc_subnet_id}}"
wait: true
volumes:
- device_name: "{{ item }}"
with_items:
- /dev/sdb
- /dev/sdc
volume_type: gp2
volume_size: 100
delete_on_termination: true
encrypted: true
register: ec2_info
But getting following error
fatal: [localhost]: FAILED! => {"failed": true, "msg": "the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'item' is undefined
If I replace the {{item}} with /dev/sdb the instance gets launched with the specific volume easily. But I want to create more than one volume with the specified list of items - /dev/sdb, /dev/sdc etc
Any possible way to achieve this?

Answer 1

You can't use with_items with vars and parameters – it's just for tasks.
You need to construct your volumes list in advance:
- name: Populate volumes list
set_fact:
vol:
device_name: "{{ item }}"
volume_type: gp2
volume_size: 100
delete_on_termination: true
encrypted: true
with_items:
- /dev/sdb
- /dev/sdc
register: volumes
And then exec ec2 module with:
volumes: "{{ volumes.results | map(attribute='ansible_facts.vol') | list }}"
Update: another approach without set_fact:
Define a variable – kind of template dictionary for volume (without device_name):
vol_default:
volume_type: gp2
volume_size: 100
delete_on_termination: true
encrypted: true
Then in your ec2 module you can use:
volumes: "{{ [{'device_name': '/dev/sdb'},{'device_name': '/dev/sdc'}] | map('combine',vol_default) | list }}"