How to I access JSON value from ansible output? - json

Question

I have this ansible playbook which will create and attach volumes to EC2 instances using ec2_vol module and I want to partition the same using parted module. Below is my ec2_vol module,
EC2_VOL Module:
ec2_vol:
aws_access_key: XXXXXXXX
aws_secret_key: XXXXXXXX
security_token: XXXXXXXX
instance: "{{ item.instance_id }}"
region: "{{ var_dict['REGION'] }}"
device_name: "{{ VOL_NAME }}"
volume_type: gp2
volume_size: '1000'
delete_on_termination: false
with_items: "{{ ec2_instances_list.instances}}"
register: ec2_volumes
- debug:
msg: "{{ ec2_volumes.results }}"
Result of ec2_volumes:
And the result that is printing from ec2_volumes.results. I want to loop through the device_name and partition the devices which is created
TASK [debug] *******************************************************************
ok: [localhost] => {
"msg": [
{
"_ansible_ignore_errors": null,
"_ansible_item_label": {
"ami_launch_index": 0,
"architecture": "x86_64",
"block_device_mappings": [
{
"device_name": "/dev/sda1",
"ebs": {
"attach_time": "2021-04-30T15:47:07+00:00",
"delete_on_termination": true,
"status": "attached",
"volume_id": "vol-XXXXXXXXXXXXXX"
}
},
{
"device_name": "/dev/sdb",
"ebs": {
"attach_time": "2021-04-30T15:47:07+00:00",
"delete_on_termination": false,
"status": "attached",
"volume_id": "vol-XXXXXXXXXXXXXXXX"
}
}
],
And here is my parted module code:
- name: Partition Additional volumes
parted:
device: "{{ item.block_device_mappings[0].device_name }}"
number: 1
part_type: 'primary'
state: present
when: ("{{ ec2_volumes.device_name }}" != "/dev/sda1")
with_items: "{{ ec2_volumes.results}}"
But still getting error that 'block_device_mappings' has no attribute.
fatal: [localhost]: FAILED! => {"msg": "'list object' has no attribute 'block_device_mappings'"}
What could be the cause? Can someone help me to resolve this issue?
Edit 1:
Facing another issue after updating the playbook in the parted module
- name: Partition Additional volumes
parted:
device: "{{ item._ansible_item_label.block_device_mappings[0].device_name }}"
number: 1
part_type: 'primary'
state: present
when: ("{{ ec2_volumes.device_name }}" != "/dev/sda1")
with_items: "{{ ec2_volumes.results}}"
fatal: [localhost]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'device_name'

Answer 1

The error is clear:
FAILED! => {"msg": "'list object' has no attribute 'block_device_mappings'"}
When you take a look at the list you'll see that block_device_mappings is an attribute of _ansible_item_label
"msg": [
{
"_ansible_ignore_errors": null,
"_ansible_item_label": {
"ami_launch_index": 0,
"architecture": "x86_64",
"block_device_mappings": [
...
Fix the reference
device: "{{ item._ansible_item_label.block_device_mappings[0].device_name }}"