playbook.yml

---
- name: Build and run Python app container
  hosts: localhost
  connection: local

  vars:
    image_name: "cyrixrr/python-app"
    image_tag: "v2"
    listen_port: 8000 # Here we set our variables
    host_port: "{{ listen_port }}" # New variable – this is the port we check and remove other containers from

  collections:
    - community.docker # Here we gave acces to Docker modules

  tasks:

    - name: Build the Docker image
      community.docker.docker_image:
        name: "{{ image_name }}"
        tag: "{{ image_tag }}"
        build:
          path: "{{ playbook_dir }}"
        source: build #This would like this in shell "docker build -t cyrixrr/python-app:v2 .

    # ---------------- NEW BLOCK START ----------------
    - name: Get Docker host info (list of all containers) # New – we gather container info so we can check used ports
      community.docker.docker_host_info:
        containers: true
      register: host_info

    - name: Remove ANY container using the host port # New – this removes any container that is using listen_port
      community.docker.docker_container:
        name: "{{ (item.Names is string) | ternary(item.Names, (item.Names | first | regex_replace('^/', ''))) }}"
        state: absent
      loop: "{{ host_info.containers | default([]) }}"
      when: >
        item.Ports is defined and
        (
          item.Ports
          | selectattr('PublicPort','defined')
          | selectattr('PublicPort','equalto', host_port | int)
          | list | length
        ) > 0
      # This loop checks every container, and if it is using 8000 on the host,
      # we remove it. This makes the playbook idempotent and avoids port conflicts.
    # ---------------- NEW BLOCK END ------------------

    - name: Remove existing container if present
      community.docker.docker_container:
        name: python-app
        state: absent #That will make it idempotent as we spoke in cource

    - name: Run the Docker container
      community.docker.docker_container:
        name: python-app
        image: "{{ image_name }}:{{ image_tag }}"
        env:
          PORT: "{{ listen_port | string }}"
        published_ports:
          - "{{ host_port }}:{{ listen_port }}" # Updated to use host_port so we can remove others first
        state: started
        restart_policy: unless-stopped #All this would like this in shell "docker run -d --name python-app -e PORT=8000 -p 8000:8000 cyrixrr/python-app:v2"