how to handle repeated module parameters?

[Tomas Karasek]

Hello,

I am testing OpenStack modules and I wonder if it's possible to somehow "pre-define" a dictionary for a resource to avoid repeating parameter declarations. I have:

---
  - quantum_network:
      auth_url: "{{ lookup('env', 'OS_AUTH_URL') }}"
      login_username: "{{ lookup('env', 'OS_USERNAME') }}"
      login_password: "{{ lookup('env', 'OS_PASSWORD') }}"
      login_tenant_name: "{{ lookup('env', 'OS_TENANT_ID') }}"

      name: "{{ network_name }}"

  - quantum_subnet:
      auth_url: "{{ lookup('env', 'OS_AUTH_URL') }}"
      login_username: "{{ lookup('env', 'OS_USERNAME') }}"
      login_password: "{{ lookup('env', 'OS_PASSWORD') }}"
      login_tenant_name: "{{ lookup('env', 'OS_TENANT_ID') }}"

      cidr: "{{ subnet_cidr }}"
      name: "{{ subnet_name }}"
[end of YAML]

All the OpenStack modules have the 4 authentication parameters, and I would like to somehow remove the duplicity of declaring them every time again.

If it would be some OOP oriented programming language, I would create an abstract class and inherit. If it would be python, I would create a base dict and then copy it and extend it. I am not sure how to achieve this in Ansible and YAML.

Is there a way to declare the auth values only one time?

Thanks.

Cheers,
Tomas

[James Cammarata]

Hi Tomas, 

Starting in 1.8 (the current devel branch) you should not need to specify these params if they are already environment variables - the module code should pick them up from the environment for you. There have been other recent improvements in the various OpenStack modules, so I would recommend checking out the development branch if you have not done so already.

Thanks!

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[Michael Hoglan]

How about moving the common authentication values into their own key in the dictionary

- name: Test variable composition

  hosts: localhost

  gather_facts: false

  vars:

    common:

      var1: var1

      shell: "{{ lookup('env', 'SHELL') }}"

    test1:

      a: 1

      b: 2

      common: "{{ common }}"

    test2:

      a: 3

      b: 4

      common: "{{ common }}"

  tasks:

     - debug: var=common

     - debug: var=test1

     - debug: var=test2

Output

(ansible)[ec2-user@ip-10-0-0-226 playbooks]$ ansible-playbook -i launched test_output.yml 

PLAY [Test variable composition] ********************************************** 

TASK: [debug var=common] ****************************************************** 

ok: [localhost] => {

    "common": {

        "shell": "/bin/bash", 

        "var1": "var1"

    }

}

TASK: [debug var=test1] ******************************************************* 

ok: [localhost] => {

    "test1": {

        "a": 1, 

        "b": 2, 

        "common": {

            "shell": "/bin/bash", 

            "var1": "var1"

        }

    }

}

TASK: [debug var=test2] ******************************************************* 

ok: [localhost] => {

    "test2": {

        "a": 3, 

        "b": 4, 

        "common": {

            "shell": "/bin/bash", 

            "var1": "var1"

        }

    }

}

PLAY RECAP ******************************************************************** 

localhost                  : ok=3    changed=0    unreachable=0    failed=0 

Thanks!

Michael

[Michael DeHaan]

Michael,

You can't make up syntax and just have it automatically passed to the modules, the original poster is asking about passing parameters repeatedly to OpenStack.

Thomas,

To at least clean up your playbook, define a variable:

vars:

      auth_url: "{{ lookup('env', 'OS_AUTH_URL') }}"

Etc.  Then you don't need to repeat the unseemly lookup string each time.

--Michael

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