92-upgrade-cluster.yml

- hosts: kube-master[0]
  tasks:
  - name: 校验 kube_upgrade_version 是否设置
    assert:
      that: kube_upgrade_version is defined
      msg: "请设置变量 kube_upgrade_version。"

  - name: 获取当前 kubernetes 实际版本
    shell: "kubeadm version -o short"
    register: kubeadm_version_output

  - name: 校验 kube_upgrade_version 与当前 kubernetes 版本差异
    assert:
      that: 
      - kubeadm_version_output.stdout is version('{{ kube_upgrade_version }}', '<=')
      - "{{ kube_upgrade_version.split('.')[1]|int - kubeadm_version_output.stdout.split('.')[1]|int }} <= 1"
      msg: "请设置正确的升级版本号，次版本号只能升一个版本，不能跨版本升级（比如：1.13版本只能升级到1.14，不能直接升级1.15）。"

- hosts: all
  roles:
  - backup

- hosts: all
  roles:
  - upgrade

- hosts: 
  - etcd
  - kube-master
  roles:
  - prepare/etcd-certificates
  - prepare/kube-certificates