Get Ansible to work on bare Ubuntu 16.04 without python 2.7

ansible-bootstrap-ubuntu-16.04.yml

# Add this snippet to the top of your playbook. 
# It will install python2 if missing (but checks first so no expensive repeated apt updates)
# gwillem@gmail.com

- hosts: all
  gather_facts: False
  
  tasks:
  - name: install python 2
    raw: test -e /usr/bin/python || (apt -y update && apt install -y python-minimal)

Thanks a lot 😄

@DanLipsitt you can make a role for it however you will need to diasable fact gathering for every playbook you use it in, and use the setup module afther to gather facts.

Great work all. Just on the question of notifying Ansible when a change has occurred, I found the following worked correctly for me without having to resort to string comparison.

- name: Install Python
  hosts: all
  gather_facts: false
  tasks:
    - name: Install Python 2.x
      raw: test -e /usr/bin/python || (apt update && apt install -y python-simplejson)
      register: test
      changed_when: test.stdout

Using Ansible 2.4.2.0 (macOS) against Ubuntu 16.04.3 (running on Digital Ocean).

Anyone have a good solution for proxies? (Raw doesn't use the environment.) I can use this.

  - name: Install python2 for ansible
    raw: export http_proxy=http://proxy.example.com:8000/; export https_proxy=http://proxy.example.com:8000/; test -e /usr/bin/python || (apt-get -y update && apt-get install -y python-minimal)
    args:
      executable: /bin/bash
    register: test
    changed_when: test.stdout

But I'd like to make the proxies optional.

@tlc, you could almost certainly use jinja expressions in what you pass to raw:

raw: |
  {% if foo %}
  http_proxy={{foo}}
  {% endif %}
  etc....

I use the following snippet, which can work across different distributions and only expects python to be installed, which is mostly the case with default ubuntu boxes:

  pre_tasks:
    - raw: which /usr/bin/python || which /usr/bin/python3
      register: py_interpreter
      changed_when: py_interpreter.stdout != ""
    - set_fact:
        ansible_python_interpreter: "{{ py_interpreter.stdout }}"
    - name: Gathering Facts
      setup: #aka gather_facts

Thanks @dpetukhov

ansible -i /path/to/inventory all -m raw -a "apt -y update && apt install -y python"

I needed to install also pyton-setuptools to avoid the error

raw: test -e /usr/bin/python || (apt -y update && apt install -y python-minimal python-setuptools)

I don't know if that is possible but if CentOS or RHEL comes without python, I did this:

raw: test -e /usr/bin/python || (yum -y update && yum install -y python) || (apt -y update && apt install -y python-minimal)

gather_facts: False pre_tasks: - name: Install python for Ansible raw: test -e /usr/bin/python || (apt -y update && apt install -y python-minimal) changed_when: False - setup: # aka gather_facts

works for me, thanks.

Thanks, a great help

does anyone know how to install python if the target machine has no internet access? Let's say I have python package located on my control machine, is there any way to copy the python package to target machine?

FWIW, I've got an ansible role based upon this thread that works for EL/RedHat/Debian/Ubuntu/FreeBSD. I just published it to ansible- galaxy. Would love for some feedback.

@staekblw

does anyone know how to install python if the target machine has no internet access? Let's say I have python package located on my control machine, is there any way to copy the python package to target machine?

I hope you've found a solution by now, but if not my suggestion would be to use 'local_action' and perform an scp or sftp command.

Lil' update, on ubuntu 18.04 installing python-minimal will prompt interactively for some libssl installation, which then sits there forever. Using test -e /usr/bin/python || (apt -y update && UCF_FORCE_CONFOLD=1 DEBIAN_FRONTEND=noninteractive apt-get -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" -qq -y install python-minimal) fixes this behavior.
Inspired by https://bugs.launchpad.net/ubuntu/+source/ansible/+bug/1833013/comments/6

Why is the raw command necessary for this? I've been having trouble running this lately (likely due to @mahlingam's comment above), and I found that this seems to work for me:

- hosts: all
  become: true
  become_user: root
  become_method: sudo
  gather_facts: no
  pre_tasks:
    - name: Install python for Ansible
      apt:
        update_cache: yes
        name:
          - python-minimal
    - setup: # aka gather_facts
  tasks:
    ...

Just wondering if there's a reason not to do this

Just wondering if there's a reason not to do this

Yep, I think it's simply that a target server without python installed, is unable to run normal ansible task steps. Using 'raw' side-steps the need for python.

PS I think bootstrapping a Python 2 installation is now likely to be unnecessary, since Ansible 2.8+ will auto-detect a suitable Python interpreter to use anyway.

https://docs.ansible.com/ansible/latest/reference_appendices/interpreter_discovery.html

If anyone is looking for a solution for Ubuntu 20.04 - change python-minimal to python2-minimal.