Ansible: EC2 provisioning and Iterations - jinja2

Question

I am trying to start a bunch of EC2 instances, then install something on them based on the IP given by AWS. With only one EC2, I can add the host and proceed without any issue,but when I chain them using with_dict, I can't achieve it anymore...
The following runs as I want, but I can't understand how to deal with the registered variable ec2_infos I got from the provisioning...
- name: Create Test EC2 instances
ec2:
group: default
image: ami-40d28157
instance_type: '{{item.value.type}}'
instance_tags:
Name: "{{ tag+'-'+item.value.name }}"
key_name: privatekey
region: us-west-1
vpc_subnet_id: subnet-REDACTD
wait: yes
with_dict: '{{ec2_stack}}'
register: ec2_infos
With a dictionary like
ec2_stack:
serv1:
type: t2.micro
name: server1
serv2:
type: t2.small
name: server2
ec2_infos is structures like:
"ec2_infos": {
"changed": true,
"msg": "All items completed",
"results": [
{
"_ansible_item_result": true,
"_ansible_no_log": false,
"_ansible_parsed": true,
"changed": true,
"instance_ids": [
"i-0fewq09812ddq6"
],
"instances": [
{
"ami_launch_index": "0",
"architecture": "x86_64",
"block_device_mapping": {
"/dev/sda1": {
"delete_on_termination": true,
"status": "attached",
"volume_id": "vol-0987654"
}
},
"dns_name": "",
"ebs_optimized": false,
"groups": {
"sg-qdwdww": "default"
},
"hypervisor": "xen",
"id": "i-083665656521dwq6",
"image_id": "ami-40d28157",
"launch_time": "2016-11-24T20:38:53.000Z",
"placement": "us-west-1d",
"private_ip": "x.x.x.x",
"public_dns_name": "",
"public_ip": null,
"ramdisk": null,
"region": "us-east-1",
"root_device_name": "/dev/sda1",
"root_device_type": "ebs",
"state": "running",
"state_code": 16,
"tags": {
"Name": "server1",
"Team": "blah"
},
"tenancy": "default","tenancy": "default",
"virtualization_type": "hvm"
}
],
"invocation": {
"module_args": {
"assign_public_ip": false,
"exact_count": null,
"group": [
"default"
],
"group_id": null,
"id": null,
"image": "ami-40d28157",
"instance_ids": null,
"instance_initiated_shutdown_behavior": null,
"instance_profile_name": null,
"instance_tags": {
"Name": "server1",
"Team": "blah"
},
"instance_type": "t2.micro",
"kernel": null,
"volumes": null,
"vpc_subnet_id": "subnet-abcdfed",
"wait": true,
"wait_timeout": "300",
"zone": null
},
"module_name": "ec2"
},
"item": {
"key": "serv1",
"value": {
"name": "server1",
"type": "t2.micro"
}
},
"tagged_instances": []
},
{
"_ansible_item_result": true,
"_ansible_no_log": false,
"_ansible_parsed": true,
"changed": true,
"instance_ids": [
"i-0971278624334fd"
],
"instances": [
{
"ami_launch_index": "0",
"architecture": "x86_64",
"block_device_mapping": {
"/dev/sda1": {
"delete_on_termination": true,
"status": "attached",
"volume_id": "vol-9999999"
}
},
"dns_name": "",
"ebs_optimized": false,
"groups": {
"sg-redactd": "default"
},
"launch_time": "2016-11-24T20:39:21.000Z",
"private_ip": "y.y.y.y",
"public_dns_name": "",
"public_ip": null,
"ramdisk": null,
"state": "running",
"state_code": 16,
"tags": {
"Name": "serv2",
"Team": "blah"
},
"tenancy": "default",
"virtualization_type": "hvm"
}
],
"invocation": {
"module_args": {
"assign_public_ip": false,
"wait_timeout": "300",
"zone": null
},
"module_name": "ec2"
},
"item": {
"key": "server2",
"value": {
"name": "serv2",
"type": "t2.small"
}
},
"tagged_instances": []
}
]
}
I tried with_items and with_subelements in different ways, but I can't manage to get every IPs of the new EC2. I don't even need to sort them just extract them from the instances part and feed them to add_host so I can proceed.
Anybody knows a clean way to do so, or would be kind enough to explain to me how to deal with a registered variable after a loop properly ?

Answer 1

Answer from the comments:
ec2_infos.results | map(attribute='instances') | sum(start=[]) | map(attribute='private_ip') | list