Use Ansible to control k8s running on CentOS 7 (Multiple ansible python interpreters in a playbook)

 1 Env

• Ansible controller: Ansible 2.10
• Managed node: CentOS 7, K8S control plane node

2 Python version conflicts between yum and k8s modules

• The yum module only works with Python 2 which is the default Python on CentOS 7.
• the k8s module only works with Python 3

3 Solution

Use  Python 2 as the default ansible python interpreter, while using Python 3 only for k8s tasks.

3.1 Ansible controller 

ansible-galaxy collection install community.kubernetes

3.2 Managed node

On the managed node, install python3 and OpenShift python module which is required by the Ansible k8s module.

# yum install python3

# pip3 install openshift

3.3 Example playbook

e.g.

---

- hosts: k8s_control_plane

  tasks:

     - name: install httpd

       yum: 

          name: httpd

          state: present

     - name: Ensure mynamespace exists

       vars:

          ansible_python_interpreter: /usr/bin/python3

       community.kubernetes.k8s:

         api_version: v1

         kind: Namespace

         name: mynamespace

         state: present