- name: Install Kubernetes
  hosts: kubernetes
  become: true

  tasks:
    - name: Disable swap
      command: swapoff -a

    - name: Comment out swap entries in /etc/fstab
      replace:
        path: /etc/fstab
        regexp: '^([^#].*\sswap\s.*)$'
        replace: '#\1'

    - name: Remove conflicting packages
      apt:
        name:
          - docker.io
          - docker-compose
          - docker-compose-v2
          - docker-doc
          - podman-docker
          - containerd
          - runc
        state: absent
        purge: true
        autoremove: true

    - name: Update and upgrade apt packages
      apt:
        update_cache: true
        upgrade: dist

    - name: Install prerequisites
      apt:
        name:
          - ca-certificates
          - curl
          - apt-transport-https
          - gpg
        state: present

    - name: Create /etc/apt/keyrings directory
      file:
        path: /etc/apt/keyrings
        state: directory
        mode: '0755'

    - name: Download Docker GPG key
      get_url:
        url: https://download.docker.com/linux/ubuntu/gpg
        dest: /etc/apt/keyrings/docker.asc
        mode: '0644'

    - name: Get Ubuntu codename
      shell: ". /etc/os-release && echo \"${UBUNTU_CODENAME:-$VERSION_CODENAME}\""
      register: ubuntu_codename
      changed_when: false

    - name: Add Docker apt repository
      copy:
        dest: /etc/apt/sources.list.d/docker.sources
        content: |
          Types: deb
          URIs: https://download.docker.com/linux/ubuntu
          Suites: {{ ubuntu_codename.stdout }}
          Components: stable
          Signed-By: /etc/apt/keyrings/docker.asc

    - name: Download Kubernetes GPG key
      shell: >
        curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.35/deb/Release.key |
        gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
      args:
        creates: /etc/apt/keyrings/kubernetes-apt-keyring.gpg

    - name: Add Kubernetes apt repository
      copy:
        dest: /etc/apt/sources.list.d/kubernetes.list
        content: "deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.35/deb/ /\n"

    - name: Update apt cache
      apt:
        update_cache: true

    - name: Install Docker and Kubernetes packages
      apt:
        name:
          - docker-ce
          - docker-ce-cli
          - containerd.io
          - docker-buildx-plugin
          - docker-compose-plugin
          - kubelet
          - kubeadm
          - kubectl
        state: present

    - name: Hold kubelet, kubeadm, kubectl at current version
      dpkg_selections:
        name: "{{ item }}"
        selection: hold
      loop:
        - kubelet
        - kubeadm
        - kubectl

    - name: Generate default containerd config
      shell: containerd config default > /etc/containerd/config.toml
      args:
        creates: /etc/containerd/config.toml

    - name: Restart containerd
      systemd:
        name: containerd
        state: restarted

    - name: Enable and start Docker
      systemd:
        name: docker
        enabled: true
        state: started

    - name: Enable and start kubelet
      systemd:
        name: kubelet
        enabled: true
        state: started

    - name: Run hello-world Docker test
      command: docker run hello-world
      changed_when: false