Ansible Tower – Running Python Script in Background via Playbook

ansibleansible-playbookansible-towerpython

Here I am trying to invoke a python script through ansible playbook. When I run the playbook containing below mentioned code, it is successfully invoking the script. But ansible script continues to run till the Python script finishes all its Task.

- hosts: localhost
  gather_facts: false
  vars:
    username: 'User'
    password: '1234@345'
  tasks:

    - name: Invoking Python script
      script: data_pull_push.py 
      args:
        executable: python

The python script "data_pull_push.py" is getting data from a Url and posting it to another Url. It has too many data. So it takes really long time to retrieve and post all the data. So I want the Ansible playbook to trigger the Python script in it and close the playbook. Python script should be running in Background.

And this Ansible playbook and python script is kept in git and will be running the playbook in Ansible tower. I am not getting any idea how to use that in Ansible. If anyone knows Please let me know.

Best Answer

You should use Asynchronous Actions and Polling Ansible feature.

So your task should looks like:

- name: Long async task
  command: python data_pull_push.py
  async: <timeout value>
  poll: 0

Related Solutions

Ansible playbook to upload and execute a python script

I have used a similar playbook which works as expected:

# playbook.yml
---
- hosts: ${target}
  sudo: yes

  tasks:
  - name: Copy file
    copy: src=../files/test.py dest=/opt/test.py owner=howardsandford group=admin mode=755

  - name: Execute script
    command: /opt/test.py

And test.py:

#!/usr/bin/python

# write to a file
f = open('/tmp/test_from_python','w')
f.write('hi there\n')

Running the playboook:

ansible-playbook playbook.yml --extra-vars "target=the_host_to_run_script_on"

Shows:

PLAY [the_host_to_run_script_on] ***************************************************************

GATHERING FACTS ***************************************************************
ok: [the_host_to_run_script_on]

TASK: [Copy file] *************************************************************
changed: [the_host_to_run_script_on]

TASK: [Execute script] ********************************************************
changed: [the_host_to_run_script_on]

PLAY RECAP ********************************************************************
the_host_to_run_script_on  : ok=3    changed=2    unreachable=0    failed=0

And on the remote host:

$ cat /tmp/test_from_python
hi there

Several differences between our setup:

I don't have single quotes around the copy and command parameters
The shebang sets the python interpreter rather than specifying /usr/bin/python from the command line
I set the owner of the script to my own username and primary group that is in sudoers, rather than root

Hopefully this can point you in the right direction of where the differences might be.

Python – Calling CGI python script as root from a web form

If you don't want to request root access each time you need to install this: https://github.com/quick2wire/quick2wire-gpio-admin

Best Answer

Related Solutions

Ansible playbook to upload and execute a python script

Python – Calling CGI python script as root from a web form

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