kubespray/roles/kubernetes/master/tasks/kubeadm-setup.yml

---
- name: kubeadm | Check if old apiserver cert exists on host
  stat:
    path: "{{ kube_cert_dir }}/apiserver.pem"
  register: old_apiserver_cert
  delegate_to: "{{ groups['kube-master'] | first }}"
  run_once: true

- name: kubeadm | Migrate old certs if necessary
  import_tasks: kubeadm-migrate-certs.yml
  when: old_apiserver_cert.stat.exists

- 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 serviceaccount key
  stat:
    path: "{{ kube_cert_dir }}/sa.key"
  register: sa_key_before
  run_once: true

- name: kubeadm | Check if kubeadm has already run
  stat:
    path: "/var/lib/kubelet/config.yaml"
  register: kubeadm_already_run

- name: kubeadm | Delete old admin.conf
  file:
    path: "{{ kube_config_dir }}/admin.conf"
    state: absent
  when:
    - not kubeadm_already_run.stat.exists

- name: kubeadm | Delete old static pods
  file:
    path: "{{ kube_config_dir }}/manifests/{{ item }}.manifest"
    state: absent
  with_items: ["kube-apiserver", "kube-controller-manager", "kube-scheduler", "kube-proxy"]
  when:
    - old_apiserver_cert.stat.exists

- name: kubeadm | Forcefully delete old static pods
  shell: "docker ps -f name=k8s_{{ item }} -q | xargs --no-run-if-empty docker rm -f"
  with_items: ["kube-apiserver", "kube-controller-manager", "kube-scheduler"]
  when:
    - old_apiserver_cert.stat.exists

- name: kubeadm | aggregate all SANs
  set_fact:
    apiserver_sans: "{{ (sans_base + groups['kube-master'] + 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-master'] | map('extract', hostvars, 'access_ip') | list | select('defined') | list }}"
    sans_ip: "{{ groups['kube-master'] | map('extract', hostvars, 'ip') | list | select('defined') | list }}"
    sans_address: "{{ groups['kube-master'] | 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-master'] | map('extract', hostvars, ['ansible_hostname']) | list | select('defined') | list }}"
    sans_fqdn: "{{ groups['kube-master'] | map('extract', hostvars, ['ansible_fqdn']) | list | select('defined') | list }}"
  tags: facts

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

- name: Write api audit policy yaml
  template:
    src: apiserver-audit-policy.yaml.j2
    dest: "{{ audit_policy_file }}"
  when: kubernetes_audit|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: kubeadm | set kubeadm version
  import_tasks: kubeadm-version.yml

- name: kubeadm | Certificate management with kubeadm
  import_tasks: kubeadm-certificate.yml
  when:
    - not upgrade_cluster_setup
    - kubeadm_already_run.stat.exists

- 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=addon/coredns
    {% if kubeadm_version is version('v1.14.0', '>=') %}
    {% if kubeadm_version is version('v1.15.0', '<') %}
    --experimental-upload-certs
    {% if kubeadm_certificate_key is defined %}
    --certificate-key={{ kubeadm_certificate_key }}
    {% endif %}
    {% else %}
    --upload-certs
    {% endif %}
    {% endif %}
  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-master']|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-master'][0]]['kubeadm_init'].stdout_lines | default([]) }}"
  when:
    - kubeadm_version is version('v1.14.0', '>=')
    - kubeadm_certificate_key is not defined
    - item | trim | 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 }}
  when:
    - inventory_hostname == groups['kube-master']|first
    - kubeadm_token is defined
  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"
  register: temp_token
  retries: 5
  delay: 5
  until: temp_token is succeeded
  delegate_to: "{{ groups['kube-master'] | 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 | Initialize other masters (experimental control plane)
  include: kubeadm-secondary-experimental.yml
  when: kubeadm_control_plane

- name: kubeadm | Initialize other masters (experimental control plane)
  include: kubeadm-secondary-legacy.yml
  when: not kubeadm_control_plane

- name: kubeadm | upgrade kubernetes cluster
  import_tasks: kubeadm-upgrade.yml
  when: upgrade_cluster_setup

- name: kubeadm | Check serviceaccount key again
  stat:
    path: "{{ kube_cert_dir }}/sa.key"
  register: sa_key_after
  run_once: true

- name: kubeadm | Set secret_changed if service account key was updated
  command: /bin/true
  notify: Master | set secret_changed
  when: sa_key_before.stat.checksum|default("") != sa_key_after.stat.checksum

- name: kubeadm | cleanup old certs if necessary
  import_tasks: kubeadm-cleanup-old-certs.yml
  when:
    - old_apiserver_cert.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 }} node-role.kubernetes.io/master:NoSchedule-"
  delegate_to: "{{ groups['kube-master'] | first }}"
  when: inventory_hostname in groups['kube-node']
  failed_when: false