Use Ansible set_fact from ec2 results. - amazon-web-services

Question

I've seen several examples but setting the IP from the results of launching ec2 intances are failing. anyone have an idea why ?
Iam using ansible 2.0.1.0
The task to launch 3 instances in 3 different subnets works corectly as follows.
tasks:
- name: elastic instance provisioning
local_action:
module: ec2
region: "{{ region }}"
key_name: "{{ key }}"
instance_type: "{{ instance_type }}"
image: "{{ image }}"
user_data: "{{ lookup('file', '/etc/ansible/host_vars/elasticsearch/user_data') }}"
key_name: "{{ key }}"
wait: yes
count: 1
group: ["{{ main_sg }}", "{{ jenkins_sg}}"]
instance_tags:
Name: elastic-test-cluster
class: database
environment: staging
vpc_subnet_id: "{{ item }}"
assign_public_ip: no
with_items:
- "{{ private_subnet_1 }}"
- "{{ private_subnet_2 }}"
- "{{ private_subnet_3 }}"
register: ec2
- debug: msg="{{ ec2.results[0].instances[0].private_ip }}"
I can debug and get expected result
TASK [debug]
ok: [localhost] => {
"msg": "10.1.100.190"
}
But this next part in the playbook fails.
- name: Add Ip for each Server
set_fact:
instance_private_ip0: "{{ ec2.results[0].instances[0].private_ip }}"
instance_private_ip1: "{{ ec2.results[1].instances[1].private_ip }}"
instance_private_ip2: "{{ ec2.results[2].instances[2].private_ip }}"
register: result
- debug: var=result
The Results from the debug is the following. Not sure what to make of it.
fatal: [localhost]: FAILED! => {"failed": true, "msg": "list object has no element 1"}

Answer 1

You can also loop over the results of the previous task:
- name: Add Ip for each Server
set_fact:
instance_private_ip{{ item.0 }}: "{{ item.1.instances[0].private_ip }}"
with_indexed_items: "{{ ec2.results }}"
Don't be confused here about item.0 and item.1. The with_indexed_items loop provides two items per iteration. item.0 is the index (0, 1, 2, ...) and item.1 is the actual content.