playbook_Dockerinstall.yml

- name: working on vm frosty
  hosts: vm
  become: true
  tasks: 
    - name: Install the packages dependencies
      ansible.builtin.apt:
        name: 
          - ca-certificates
          - curl
          - gnupg
          - lsb-release
        state: latest
        update_cache: true

    - name: check if dependencies are installed
      ansible.builtin.shell: dpkg -l 'ca-certificates' && dpkg -l 'curl' &&  dpkg -l 'gnupg' && dpkg -l 'lsb-release'
      register: certificates
      failed_when: certificates.stderr != ''
      changed_when: false

    - name: add keyrings directory
      ansible.builtin.file:
        path: /etc/apt/keyrings
        state: directory 

    - name: add docker apt key
      ansible.builtin.apt_key:
        url: https://download.docker.com/linux/ubuntu/gpg
        state: present
        keyring: /etc/apt/keyrings/docker.gpg

    - name: check if gpg key is installed
      ansible.builtin.shell: apt-key adv --list-public-keys --with-fingerprint --with-colons | grep docker
      register: dockergpg
      changed_when: false

    - name: Add specified repository into sources list
      ansible.builtin.apt_repository:
        repo: deb https://download.docker.com/linux/ubuntu focal state
        state: present

    - name: check added docker repository
      ansible.builtin.shell: cat "/etc/apt/sources.list.d/Docker.list"
      register: dockerrepo
      failed_when: dockerrepo.stderr != ''
      changed_when: false
    
    - name: apt-get update
      ansible.builtin.shell: sudo apt-get update
    
    - name: Install the package "docker"
      ansible.builtin.apt:
        name: 
          - docker-ce
          - docker-ce-cli 
          - containerd.io 
          - docker-compose-plugin
        state: latest
        # update_cache: true ist das äqivalent zu apt-get update 

    - name: check if docker components are installed
      ansible.builtin.shell: dpkg -l 'docker-ce' && dpkg -l 'docker-ce-cli' &&  dpkg -l 'containerd.io' && dpkg -l 'docker-compose-plugin'
      register: dockercomponents
      failed_when: dockercomponents.stderr != ''
      changed_when: false

    - name: Is docker running
      ansible.builtin.service:
        name: docker
        state: started

    - name: Add the user "snowman" to docker group
      ansible.builtin.user:
        name: snowman
        comment: user of the vm
        uid: 1000
        group: docker

    - name: check if user is added to docker group
      ansible.builtin.shell: id -nG snowman | grep -o docker
      register: dockeruser
      failed_when: dockeruser.stderr != ''
      changed_when: false

    - name: run Hello-world container
      community.docker.docker_container:
        name: hello-world_Ulli
        image: hello-world

    - name: check if hello-world container is running
      ansible.builtin.shell: docker ps | grep hello-world
      register: hello
      failed_when: hello.stderr != ''
      changed_when: false