Error mounting EFS volume to EC2 instance using ansible facts

[Anuj Dogra]

I have the following tasks in my ansible playbook to register the AZ for an AWS resource:

- name: Get current AZ from AWS.

  uri:

    url: http://169.254.169.254/latest/meta-data/placement/availability-zone

    return_content: yes

  register: aws_current_az

- name: Ensure EFS volume is mounted.

  mount:

    name: "{{ efs_mount_dir }}"

    src: "{{ aws_current_az.content }}.{{ efs_file_system_id }}.efs.{{ aws_region }}.amazonaws.com:/"

    fstype: nfs4

    opts: nfsvers=4.1

    state: mounted

However, I am encountering the following error when I check the diff on the ansible playbook:

FAILED! => {"failed": true, "msg": "the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'dict object' has no attribute 'content

The 'content' being registered in the first task, does not register in the second. 

This is causing my idempotency checks to fail. These tasks work fine when running, but only fail when checking the difference. Any idea why?

FYI: Using the following geerlingguy Ansible playbook: https://www.jeffgeerling.com/blog/2017/mount-aws-efs-filesystem-on-ec2-instance-ansible 

Thanks in advance.

[Goetz Leupold]

Did you debug the var: aws_current_az?
A possible problem could be, that is a list or not set correctly.

[Anuj Dogra]

Yeah, I tried that as well but still encountering the same error. I have a Jenkins job that checks idempotency with the Ansible playbook that is still failing even with the following:

- name: Ensure EFS volume is mounted.

  mount:

    name: "{{ efs_mount_dir }}"

    src: "{{ aws_current_az.content }}.{{ efs_file_system_id }}.efs.{{ aws_region }}.amazonaws.com:/"

    fstype: nfs4

    opts: nfsvers=4.1

    state: mounted

  changed_when: False

  ignore_errors: True

- debug: var=aws_current_az

[Stephen Granger]

There is a PR for an az facts module open at the moment which is able to return the available AZ's
https://github.com/ansible/ansible/pull/20690

It will allow you to test what az's might exist. Otherwise I'd follow up on what has already been said to see what keys have been included with the registered variable, aws_current_az

- name: Show contents of aws_current_az

  debug:

    var: aws_current_az

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