kubespray/roles/etcd/tasks/check_certs.yml

---
- name: "Check_certs | Register certs that have already been generated on first etcd node"
  find:
    paths: "{{ etcd_cert_dir }}"
    patterns: "ca.pem,node*.pem,member*.pem,admin*.pem"
    get_checksum: true
  delegate_to: "{{ groups['etcd'][0] }}"
  register: etcdcert_master
  run_once: true

- name: "Check_certs | Set default value for 'sync_certs', 'gen_certs' and 'etcd_secret_changed' to false"
  set_fact:
    sync_certs: false
    gen_certs: false
    etcd_secret_changed: false

- name: "Check certs | Register ca and etcd admin/member certs on etcd hosts"
  stat:
    path: "{{ etcd_cert_dir }}/{{ item }}"
    get_attributes: false
    get_checksum: true
    get_mime: false
  register: etcd_member_certs
  when: ('etcd' in group_names)
  with_items:
    - ca.pem
    - member-{{ inventory_hostname }}.pem
    - member-{{ inventory_hostname }}-key.pem
    - admin-{{ inventory_hostname }}.pem
    - admin-{{ inventory_hostname }}-key.pem

- name: "Check certs | Register ca and etcd node certs on kubernetes hosts"
  stat:
    path: "{{ etcd_cert_dir }}/{{ item }}"
  register: etcd_node_certs
  when: ('k8s_cluster' in group_names)
  with_items:
    - ca.pem
    - node-{{ inventory_hostname }}.pem
    - node-{{ inventory_hostname }}-key.pem

- name: "Check_certs | Set 'gen_certs' to true if expected certificates are not on the first etcd node(1/2)"
  set_fact:
    gen_certs: true
  when: force_etcd_cert_refresh or not item in etcdcert_master.files | map(attribute='path') | list
  run_once: true
  with_items: "{{ expected_files }}"
  vars:
    expected_files: >-
      ['{{ etcd_cert_dir }}/ca.pem',
      {% set etcd_members = groups['etcd'] %}
      {% for host in etcd_members %}
        '{{ etcd_cert_dir }}/admin-{{ host }}.pem',
        '{{ etcd_cert_dir }}/admin-{{ host }}-key.pem',
        '{{ etcd_cert_dir }}/member-{{ host }}.pem',
        '{{ etcd_cert_dir }}/member-{{ host }}-key.pem',
      {% endfor %}
      {% set k8s_nodes = groups['kube_control_plane'] %}
      {% for host in k8s_nodes %}
        '{{ etcd_cert_dir }}/node-{{ host }}.pem',
        '{{ etcd_cert_dir }}/node-{{ host }}-key.pem'
        {% if not loop.last %}{{ ',' }}{% endif %}
      {% endfor %}]

- name: "Check_certs | Set 'gen_certs' to true if expected certificates are not on the first etcd node(2/2)"
  set_fact:
    gen_certs: true
  run_once: true
  with_items: "{{ expected_files }}"
  vars:
    expected_files: >-
      ['{{ etcd_cert_dir }}/ca.pem',
      {% set etcd_members = groups['etcd'] %}
      {% for host in etcd_members %}
        '{{ etcd_cert_dir }}/admin-{{ host }}.pem',
        '{{ etcd_cert_dir }}/admin-{{ host }}-key.pem',
        '{{ etcd_cert_dir }}/member-{{ host }}.pem',
        '{{ etcd_cert_dir }}/member-{{ host }}-key.pem',
      {% endfor %}
      {% set k8s_nodes = groups['k8s_cluster'] | unique | sort %}
      {% for host in k8s_nodes %}
        '{{ etcd_cert_dir }}/node-{{ host }}.pem',
        '{{ etcd_cert_dir }}/node-{{ host }}-key.pem'
        {% if not loop.last %}{{ ',' }}{% endif %}
      {% endfor %}]
  when:
    - kube_network_plugin in ["calico", "flannel", "cilium"] or cilium_deploy_additionally | default(false) | bool
    - kube_network_plugin != "calico" or calico_datastore == "etcd"
    - force_etcd_cert_refresh or not item in etcdcert_master.files | map(attribute='path') | list

- name: "Check_certs | Set 'gen_*_certs' groups to track which nodes needs to have certs generated on first etcd node"
  vars:
    existing_certs: etcdcert_master.files | map(attribute='path')
  ansible.builtin.group_by:
    key: "gen_{{ item.node_type }}_certs_{{ force_etcd_cert_refresh or item.certs is not subset(existing_certs) }}"
  loop: "{{ cert_files | dict2items(key_name='node_type', value_name='certs') }}"

- name: "Check_certs | Set 'etcd_member_requires_sync' to true if ca or member/admin cert and key don't exist on etcd member or checksum doesn't match"
  set_fact:
    etcd_member_requires_sync: true
  when:
    - ('etcd' in group_names)
    - (not etcd_member_certs.results[0].stat.exists | default(false)) or
      (not etcd_member_certs.results[1].stat.exists | default(false)) or
      (not etcd_member_certs.results[2].stat.exists | default(false)) or
      (not etcd_member_certs.results[3].stat.exists | default(false)) or
      (not etcd_member_certs.results[4].stat.exists | default(false)) or
      (etcd_member_certs.results[0].stat.checksum | default('') != etcdcert_master.files | selectattr("path", "equalto", etcd_member_certs.results[0].stat.path) | map(attribute="checksum") | first | default('')) or
      (etcd_member_certs.results[1].stat.checksum | default('') != etcdcert_master.files | selectattr("path", "equalto", etcd_member_certs.results[1].stat.path) | map(attribute="checksum") | first | default('')) or
      (etcd_member_certs.results[2].stat.checksum | default('') != etcdcert_master.files | selectattr("path", "equalto", etcd_member_certs.results[2].stat.path) | map(attribute="checksum") | first | default('')) or
      (etcd_member_certs.results[3].stat.checksum | default('') != etcdcert_master.files | selectattr("path", "equalto", etcd_member_certs.results[3].stat.path) | map(attribute="checksum") | first | default('')) or
      (etcd_member_certs.results[4].stat.checksum | default('') != etcdcert_master.files | selectattr("path", "equalto", etcd_member_certs.results[4].stat.path) | map(attribute="checksum") | first | default(''))

- name: "Check_certs | Set 'kubernetes_host_requires_sync' to true if ca or node cert and key don't exist on kubernetes host or checksum doesn't match"
  set_fact:
    kubernetes_host_requires_sync: true
  when:
    - ('k8s_cluster' in group_names) and
      inventory_hostname not in groups['etcd']
    - (not etcd_node_certs.results[0].stat.exists | default(false)) or
      (not etcd_node_certs.results[1].stat.exists | default(false)) or
      (not etcd_node_certs.results[2].stat.exists | default(false)) or
      (etcd_node_certs.results[0].stat.checksum | default('') != etcdcert_master.files | selectattr("path", "equalto", etcd_node_certs.results[0].stat.path) | map(attribute="checksum") | first | default('')) or
      (etcd_node_certs.results[1].stat.checksum | default('') != etcdcert_master.files | selectattr("path", "equalto", etcd_node_certs.results[1].stat.path) | map(attribute="checksum") | first | default('')) or
      (etcd_node_certs.results[2].stat.checksum | default('') != etcdcert_master.files | selectattr("path", "equalto", etcd_node_certs.results[2].stat.path) | map(attribute="checksum") | first | default(''))

- name: "Check_certs | Set 'sync_certs' to true"
  set_fact:
    sync_certs: true
  when:
    - etcd_member_requires_sync | default(false) or
      kubernetes_host_requires_sync | default(false) or
      'gen_master_certs_True' in group_names or
      'gen_node_certs_True' in group_names