upgrade.yml

- hosts: all
  vars:
    kube_version: 1.20.2

  tasks:
    - name: apt-get update
      apt:
        update_cache: yes
        autoclean: yes
        autoremove: yes
    - name: Upgrade Kubernetes (kubelet, kubeadm, kubectl)
      apt:
        pkg:
          - kubeadm={{ kube_version }}-00
          - kubelet={{ kube_version }}-00
          - kubectl={{ kube_version }}-00
        dpkg_options: force-downgrade
        force: yes

    - name: Upgrade one node
      command: "kubeadm upgrade apply v{{ kube_version }} --ignore-preflight-errors=ControlPlaneNodesReady --yes"
      # For the other control plane nodes
      # Same as the first control plane node but use:
      # kubeadm upgrade node
      # instead of:
      # kubeadm upgrade apply
      # https://v1-16.docs.kubernetes.io/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade/
      when: inventory_hostname == play_hosts[0]

    - name: Reinstall Flannel (For Kubernetes v1.17+)
      # https://stackoverflow.com/questions/49112336/container-runtime-network-not-ready-cni-config-uninitialized
      command: kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
      when: inventory_hostname == play_hosts[0]

    - name: Upgrade other nodes
      command: "kubeadm upgrade node"
      when: inventory_hostname != play_hosts[0]

- hosts: master
  tasks:
    - name: Uncordon Hosts
      shell: "kubectl uncordon {{ item }}"
      with_items:
        - "{{ groups['all'] }}"
      tags: uncordon