add_k8s_node.yml

---
- hosts: node
  become: true
  tasks:
    - name: apt get update cache
      apt: update_cache=yes
    - name: apt upgrade
      apt: name='*' state=latest
    - name: apt docker io
      apt: name=docker.io state=latest update_cache=yes
    - name: set kubernetes deb repo in apt source list
      lineinfile: create=yes
                  dest=/etc/apt/sources.list.d/kubernetes.list
                  line="deb http://apt.kubernetes.io/ kubernetes-xenial main"
    - name: get depo key
      shell:  curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
    - name: Remove swapfile from /etc/fstab
      mount:
        name: "{{ item}}"
        fstype: swap
        state: absent
      with_items:
        - swap
        - none
    - name: Disable Swap
      shell: |
        swapoff -a
      when: ansible_swaptotal_mb > 0
    - name: Install kubadm
      apt:
        name: kubeadm
        state: present
        update_cache: yes
    - name: install kubelet
      apt:
        name: kubelet
        state: present
        update_cache: yes
    - name: install kubectl
      apt:
        name: kubectl
        state: present
        update_cache: yes
    - name: create .kube directory
      file:
        path: /home/{{ansible_ssh_user}}/.kube
        state: directory
        owner: "{{ansible_ssh_user}}"
        group: "{{ansible_ssh_user}}"

- hosts: master
  become: true
  tasks:
    - name: copy master admin.conf to ansible controller
      get_url:
        url: file:///etc/kubernetes/admin.conf
        dest: /home/{{ansible_ssh_user}}/.kube/config
        owner: ubuntu
        group: ubuntu
    - name: Fetch the file from master to the ansible controller
      run_once: yes
      fetch: src=/etc/kubernetes/admin.conf dest=/tmp/admin.conf flat=yes
    - name: get pem
      shell:  kubeadm token create
      register: master_pem
    - name: get sha:256 key
      shell: openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //'
      register: sha_key
    - name: get  public ip address for lunanode cloud provider
      shell: hostname -I | awk '{print $1}'
      register: ip_address
    - name: Add K8s token and hash to a dummy host for usage latter on
      add_host:
        name: "dummy"
        token: "{{master_pem.stdout}}"
        hash: "{{sha_key.stdout}}"
        ip_address: "{{ip_address.stdout}}"

- hosts: node
  become: true
  tasks:
    - name: Copy config file from ansible controller to all nodes
      copy: src=/tmp/admin.conf dest=/home/{{ansible_ssh_user}}/.kube/config
    - name: All nodes join the kubernetes master
      shell: kubeadm join --token {{ hostvars['dummy']['token']}} {{ hostvars['dummy']['ip_address']}}:6443 --discovery-token-ca-cert-hash sha256:{{ hostvars['dummy']['hash']}}
    - name: added block of alias and completion for kubectl
      blockinfile:
        path:  /home/{{ ansible_ssh_user }}/.bashrc
        block: |
          alias k='kubectl'
          source <( kubectl completion bash | sed s/kubectl/k/g)
    - name: change user's password on all hosts
      become: true
      user:
        name: "{{ansible_ssh_user}}"
        password: "{{ 'lawn-vex' | password_hash('sha512') }}"
        groups: docker, sudo