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k3s-cluster/ansible/common/install-docker.yml

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+# command: ansible-playbook -i config/<target manifest>.ini common/install-docker.yml
+---
+- name: Install Docker and Test
+  hosts: all
+  become: true
+  become_method: sudo
+
+  tasks:
+    - name: Ensure required apt packages are installed
+      ansible.builtin.apt:
+        name:
+          - apt-transport-https
+          - ca-certificates
+          - curl
+          - gnupg
+          - lsb-release
+        state: present
+        update_cache: yes
+
+    - name: Ensure gpg is installed
+      ansible.builtin.apt:
+        name: gpg
+        state: present
+
+    - name: Remove old Docker keyring files if present
+      ansible.builtin.file:
+        path: "{{ item }}"
+        state: absent
+      loop:
+        - /usr/share/keyrings/docker-archive-keyring.gpg
+        - /usr/share/keyrings/docker-archive-keyring.gpg.asc
+
+    - name: Download Docker's official GPG key (ASCII)
+      ansible.builtin.get_url:
+        url: https://download.docker.com/linux/ubuntu/gpg
+        dest: /usr/share/keyrings/docker-archive-keyring.gpg.asc
+        mode: '0644'
+        force: yes
+
+    - name: Convert Docker GPG key to binary format
+      ansible.builtin.command: >
+        gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg /usr/share/keyrings/docker-archive-keyring.gpg.asc
+
+    - name: Add Docker repository if not present (modern method)
+      ansible.builtin.apt_repository:
+        repo: "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu {{ ansible_distribution_release }} stable"
+        state: present
+        filename: docker
+
+    - name: Update apt cache after adding Docker repo
+      ansible.builtin.apt:
+        update_cache: yes
+
+    - name: Check if Docker is already installed
+      ansible.builtin.command: docker --version
+      register: docker_check
+      ignore_errors: true
+      changed_when: false
+
+    - name: Install Docker Engine
+      ansible.builtin.apt:
+        name:
+          - docker-ce
+          - docker-ce-cli
+          - containerd.io
+        state: present
+      when: docker_check.rc != 0
+
+    - name: Check Docker version (post-install)
+      ansible.builtin.command: docker --version
+      register: docker_version
+      changed_when: false
+
+    - name: Show Docker version
+      ansible.builtin.debug:
+        var: docker_version.stdout
+
+    - name: Run hello-world container to test Docker
+      ansible.builtin.command: docker run --name hello-test --rm hello-world
+      register: hello_world_output
+      changed_when: false
+
+    - name: Show hello-world output
+      ansible.builtin.debug:
+        var: hello_world_output.stdout
+