- hosts: k8s
  - name: add Kubernetes apt-key
      apt_key:
        url: https://packages.cloud.google.com/apt/doc/apt-key.gpg
        state: present

    - name: add Kubernetes' APT repository
      apt_repository:
        repo: deb http://apt.kubernetes.io/ kubernetes-xenial main
        state: present
        filename: 'kubernetes'

    - name: install kubelet
      apt:
        name: kubelet={{ kube_version }}
        state: present
        update_cache: true

    - name: install kubeadm
      apt:
        name: kubeadm={{ kube_version }}
        state: present

- hosts: k8s-master
  become: yes
  tasks:
    - name: install kubectl
      apt:
        name: kubectl={{ kube_version }}
        state: present
        force: yes

    - name: initialize the cluster
      shell: kubeadm init --pod-network-cidr=10.244.0.0/16 >> cluster_initialized.txt
      args:
        chdir: $HOME
        creates: cluster_initialized.txt

    - name: create .kube directory
      become: yes
      become_user: ubuntu
      file:
        path: $HOME/.kube
        state: directory
        mode: 0755

    - name: copy admin.conf to user's kube config
      copy:
        src: /etc/kubernetes/admin.conf
        dest: /home/ubuntu/.kube/config
        remote_src: yes
        owner: ubuntu

    - name: install Pod network
      become: yes
      become_user: ubuntu
      shell: kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/a70459be0084506e4ec919aa1c114638878db11b/Documentation/kube-flannel.yml >> pod_network_setup.txt
      args:
        chdir: $HOME
        creates: pod_network_setup.txt

- hosts: k8s-master
  become: yes
  gather_facts: false
  tasks:
    - name: get join command
      shell: kubeadm token create --print-join-command
      register: join_command_raw

    - name: set join command
      set_fact:
        join_command: "{{ join_command_raw.stdout_lines[0] }}"


- hosts: k8s-workers
  become: yes
  tasks:
    - name: join cluster
      shell: "{{ hostvars['master'].join_command }} >> node_joined.txt"
      args:
        chdir: $HOME
        creates: node_joined.txt