kubespray/extra_playbooks/upgrade-only-k8s.yml

---
### NOTE: This playbook cannot be used to deploy any new nodes to the cluster.
### Additional information:
### * Will not upgrade etcd
### * Will not upgrade network plugins
### * Will not upgrade Docker
### * Will not pre-download containers or kubeadm
### * Currently does not support Vault deployment.
###
### In most cases, you probably want to use upgrade-cluster.yml playbook and
### not this one.

- name: Setup ssh config to use the bastion
  hosts: localhost
  gather_facts: False
  roles:
    - { role: kubespray-defaults}
    - { role: bastion-ssh-config, tags: ["localhost", "bastion"]}

- name: Bootstrap hosts OS for Ansible
  hosts: k8s_cluster:etcd:calico_rr
  any_errors_fatal: "{{ any_errors_fatal | default(true) }}"
  gather_facts: false
  vars:
    # Need to disable pipelining for bootstrap-os as some systems have requiretty in sudoers set, which makes pipelining
    # fail. bootstrap-os fixes this on these systems, so in later plays it can be enabled.
    ansible_ssh_pipelining: false
  roles:
    - { role: kubespray-defaults}
    - { role: bootstrap-os, tags: bootstrap-os}

- name: Preinstall
  hosts: k8s_cluster:etcd:calico_rr
  any_errors_fatal: "{{ any_errors_fatal | default(true) }}"
  roles:
    - { role: kubespray-defaults}
    - { role: kubernetes/preinstall, tags: preinstall }

- name: Handle upgrades to master components first to maintain backwards compat.
  hosts: kube_control_plane
  any_errors_fatal: "{{ any_errors_fatal | default(true) }}"
  serial: 1
  roles:
    - { role: kubespray-defaults}
    - { role: upgrade/pre-upgrade, tags: pre-upgrade }
    - { role: kubernetes/node, tags: node }
    - { role: kubernetes/control-plane, tags: master, upgrade_cluster_setup: true }
    - { role: kubernetes/client, tags: client }
    - { role: kubernetes-apps/cluster_roles, tags: cluster-roles }
    - { role: upgrade/post-upgrade, tags: post-upgrade }

- name: Finally handle worker upgrades, based on given batch size
  hosts: kube_node:!kube_control_plane
  any_errors_fatal: "{{ any_errors_fatal | default(true) }}"
  serial: "{{ serial | default('20%') }}"
  roles:
    - { role: kubespray-defaults}
    - { role: upgrade/pre-upgrade, tags: pre-upgrade }
    - { role: kubernetes/node, tags: node }
    - { role: upgrade/post-upgrade, tags: post-upgrade }
    - { role: kubespray-defaults}