kubespray/roles/kubernetes/control-plane/tasks/kubeadm-setup.yml

---
- name: Install OIDC certificate
  copy:
    content: "{{ kube_oidc_ca_cert | b64decode }}"
    dest: "{{ kube_oidc_ca_file }}"
    owner: root
    group: root
    mode: "0644"
  when:
    - kube_oidc_auth
    - kube_oidc_ca_cert is defined

- name: kubeadm | Check if kubeadm has already run
  stat:
    path: "/var/lib/kubelet/config.yaml"
    get_attributes: no
    get_checksum: no
    get_mime: no
  register: kubeadm_already_run

- name: kubeadm | Backup kubeadm certs / kubeconfig
  import_tasks: kubeadm-backup.yml
  when:
    - kubeadm_already_run.stat.exists

- name: kubeadm | aggregate all SANs
  set_fact:
    apiserver_sans: "{{ (sans_base + groups['kube_control_plane'] + sans_lb + sans_lb_ip + sans_supp + sans_access_ip + sans_ip + sans_address + sans_override + sans_hostname + sans_fqdn) | unique }}"
  vars:
    sans_base:
      - "kubernetes"
      - "kubernetes.default"
      - "kubernetes.default.svc"
      - "kubernetes.default.svc.{{ dns_domain }}"
      - "{{ kube_apiserver_ip }}"
      - "localhost"
      - "127.0.0.1"
    sans_lb: "{{ [apiserver_loadbalancer_domain_name] if apiserver_loadbalancer_domain_name is defined else [] }}"
    sans_lb_ip: "{{ [loadbalancer_apiserver.address] if loadbalancer_apiserver is defined and loadbalancer_apiserver.address is defined else [] }}"
    sans_supp: "{{ supplementary_addresses_in_ssl_keys if supplementary_addresses_in_ssl_keys is defined else [] }}"
    sans_access_ip: "{{ groups['kube_control_plane'] | map('extract', hostvars, 'access_ip') | list | select('defined') | list }}"
    sans_ip: "{{ groups['kube_control_plane'] | map('extract', hostvars, 'ip') | list | select('defined') | list }}"
    sans_address: "{{ groups['kube_control_plane'] | map('extract', hostvars, ['ansible_default_ipv4', 'address']) | list | select('defined') | list }}"
    sans_override: "{{ [kube_override_hostname] if kube_override_hostname else [] }}"
    sans_hostname: "{{ groups['kube_control_plane'] | map('extract', hostvars, ['ansible_hostname']) | list | select('defined') | list }}"
    sans_fqdn: "{{ groups['kube_control_plane'] | map('extract', hostvars, ['ansible_fqdn']) | list | select('defined') | list }}"
  tags: facts

- name: Create audit-policy directory
  file:
    path: "{{ audit_policy_file | dirname }}"
    state: directory
    mode: 0640
  when: kubernetes_audit|default(false) or kubernetes_audit_webhook|default(false)

- name: Write api audit policy yaml
  template:
    src: apiserver-audit-policy.yaml.j2
    dest: "{{ audit_policy_file }}"
    mode: 0640
  when: kubernetes_audit|default(false) or kubernetes_audit_webhook|default(false)

- name: Write api audit webhook config yaml
  template:
    src: apiserver-audit-webhook-config.yaml.j2
    dest: "{{ audit_webhook_config_file }}"
    mode: 0640
  when: kubernetes_audit_webhook|default(false)

# Nginx LB(default), If kubeadm_config_api_fqdn is defined, use other LB by kubeadm controlPlaneEndpoint.
- name: set kubeadm_config_api_fqdn define
  set_fact:
    kubeadm_config_api_fqdn: "{{ apiserver_loadbalancer_domain_name|default('lb-apiserver.kubernetes.local') }}"
  when: loadbalancer_apiserver is defined

- name: Set kubeadm api version to v1beta2
  set_fact:
    kubeadmConfig_api_version: v1beta2

- name: kubeadm | Create kubeadm config
  template:
    src: "kubeadm-config.{{ kubeadmConfig_api_version }}.yaml.j2"
    dest: "{{ kube_config_dir }}/kubeadm-config.yaml"
    mode: 0640

- name: kubeadm | Check if apiserver.crt contains all needed SANs
  shell: |
    set -o pipefail
    for IP in {{ apiserver_ips | join(' ') }}; do
      openssl x509 -noout -in "{{ kube_cert_dir }}/apiserver.crt" -checkip $IP | grep -q 'does match certificate' || echo 'NEED-RENEW'
    done
    for HOST in {{ apiserver_hosts | join(' ') }}; do
      openssl x509 -noout -in "{{ kube_cert_dir }}/apiserver.crt" -checkhost $HOST | grep -q 'does match certificate' || echo 'NEED-RENEW'
    done    
  vars:
    apiserver_ips: "{{ apiserver_sans|map('ipaddr')|reject('equalto', False)|list }}"
    apiserver_hosts: "{{ apiserver_sans|difference(apiserver_ips) }}"
  args:
    executable: /bin/bash
  register: apiserver_sans_check
  changed_when: "'NEED-RENEW' in apiserver_sans_check.stdout"
  when:
    - kubeadm_already_run.stat.exists

- name: kubeadm | regenerate apiserver cert 1/2
  file:
    state: absent
    path: "{{ kube_cert_dir }}/{{ item }}"
  with_items:
    - apiserver.crt
    - apiserver.key
  when:
    - kubeadm_already_run.stat.exists
    - apiserver_sans_check.changed

- name: kubeadm | regenerate apiserver cert 2/2
  command: >-
    {{ bin_dir }}/kubeadm
    init phase certs apiserver
    --config={{ kube_config_dir }}/kubeadm-config.yaml    
  when:
    - kubeadm_already_run.stat.exists
    - apiserver_sans_check.changed

- name: kubeadm | Initialize first master
  command: >-
    timeout -k 300s 300s
    {{ bin_dir }}/kubeadm init
    --config={{ kube_config_dir }}/kubeadm-config.yaml
    --ignore-preflight-errors=all
    --skip-phases={{ kubeadm_init_phases_skip | join(',') }}
    --upload-certs    
  register: kubeadm_init
  # Retry is because upload config sometimes fails
  retries: 3
  until: kubeadm_init is succeeded or "field is immutable" in kubeadm_init.stderr
  when: inventory_hostname == groups['kube_control_plane']|first and not kubeadm_already_run.stat.exists
  failed_when: kubeadm_init.rc != 0 and "field is immutable" not in kubeadm_init.stderr
  environment:
    PATH: "{{ bin_dir }}:{{ ansible_env.PATH }}"
  notify: Master | restart kubelet

- name: set kubeadm certificate key
  set_fact:
    kubeadm_certificate_key: "{{ item | regex_search('--certificate-key ([^ ]+)','\\1') | first }}"
  with_items: "{{ hostvars[groups['kube_control_plane'][0]]['kubeadm_init'].stdout_lines | default([]) }}"
  when:
    - kubeadm_certificate_key is not defined
    - (item | trim) is match('.*--certificate-key.*')

- name: Create hardcoded kubeadm token for joining nodes with 24h expiration (if defined)
  shell: >-
    {{ bin_dir }}/kubeadm --kubeconfig /etc/kubernetes/admin.conf token delete {{ kubeadm_token }} || :;
    {{ bin_dir }}/kubeadm --kubeconfig /etc/kubernetes/admin.conf token create {{ kubeadm_token }}    
  changed_when: false
  when:
    - inventory_hostname == groups['kube_control_plane']|first
    - kubeadm_token is defined
    - kubeadm_refresh_token
  tags:
    - kubeadm_token

- name: Create kubeadm token for joining nodes with 24h expiration (default)
  command: "{{ bin_dir }}/kubeadm --kubeconfig /etc/kubernetes/admin.conf token create"
  changed_when: false
  register: temp_token
  retries: 5
  delay: 5
  until: temp_token is succeeded
  delegate_to: "{{ groups['kube_control_plane'] | first }}"
  when: kubeadm_token is not defined
  tags:
    - kubeadm_token

- name: Set kubeadm_token
  set_fact:
    kubeadm_token: "{{ temp_token.stdout }}"
  when: temp_token.stdout is defined
  tags:
    - kubeadm_token

- name: kubeadm | Join other masters
  include_tasks: kubeadm-secondary.yml

- name: kubeadm | upgrade kubernetes cluster
  include_tasks: kubeadm-upgrade.yml
  when:
    - upgrade_cluster_setup
    - kubeadm_already_run.stat.exists

# FIXME(mattymo): from docs: If you don't want to taint your control-plane node, set this field to an empty slice, i.e. `taints: {}` in the YAML file.
- name: kubeadm | Remove taint for master with node role
  command: "{{ bin_dir }}/kubectl --kubeconfig {{ kube_config_dir }}/admin.conf taint node {{ inventory_hostname }} {{ item }}"
  delegate_to: "{{ groups['kube_control_plane'] | first }}"
  with_items:
    - "node-role.kubernetes.io/master:NoSchedule-"
    - "node-role.kubernetes.io/control-plane:NoSchedule-"
  when: inventory_hostname in groups['kube_node']
  failed_when: false