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: kubeadm | Check apiserver key
  stat:
    path: "{{ kube_cert_dir }}/apiserver.key"
  register: apiserver_key_before
  delegate_to: "{{groups['kube-master']|first}}"
  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: >-
      kubernetes
      kubernetes.default
      kubernetes.default.svc
      kubernetes.default.svc.{{ dns_domain }}
      {{ kube_apiserver_ip }}
      localhost
      127.0.0.1
      {{ ' '.join(groups['kube-master']) }}
      {%- if loadbalancer_apiserver is defined %}
      {{ apiserver_loadbalancer_domain_name }}
      {%- endif %}
      {% for host in groups['kube-master'] -%}
      {%- if hostvars[host]['access_ip'] is defined -%}
      {{ hostvars[host]['access_ip'] }}
      {%- endif %}
      {{ hostvars[host]['ip'] | default(hostvars[host]['ansible_default_ipv4']['address']) }}
      {%- endfor %}
      {%- if supplementary_addresses_in_ssl_keys is defined -%}
      {% for addr in supplementary_addresses_in_ssl_keys %}
      {{ addr }}
      {%- endfor %}
      {%- endif %}      
  tags: facts

- name: kubeadm | Copy etcd cert dir under k8s cert dir
  command: "cp -TR {{ etcd_cert_dir }} {{ kube_config_dir }}/ssl/etcd"
  changed_when: false

- 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 600s 600s {{ bin_dir }}/kubeadm init --config={{ kube_config_dir }}/kubeadm-config.yaml --ignore-preflight-errors=all
  register: kubeadm_init
  # Retry is because upload config sometimes fails
  retries: 3
  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
  notify: Master | restart kubelet

- name: slurp kubeadm certs
  slurp:
    src: "{{ item }}"
  with_items:
    - "{{ kube_cert_dir }}/apiserver.crt"
    - "{{ kube_cert_dir }}/apiserver.key"
    - "{{ kube_cert_dir }}/apiserver-kubelet-client.crt"
    - "{{ kube_cert_dir }}/apiserver-kubelet-client.key"
    - "{{ kube_cert_dir }}/ca.crt"
    - "{{ kube_cert_dir }}/ca.key"
    - "{{ kube_cert_dir }}/front-proxy-ca.crt"
    - "{{ kube_cert_dir }}/front-proxy-ca.key"
    - "{{ kube_cert_dir }}/front-proxy-client.crt"
    - "{{ kube_cert_dir }}/front-proxy-client.key"
    - "{{ kube_cert_dir }}/sa.key"
    - "{{ kube_cert_dir }}/sa.pub"
  register: kubeadm_certs
  delegate_to: "{{ groups['kube-master']|first }}"
  run_once: true

- name: kubeadm | write out kubeadm certs
  copy:
    dest: "{{ item.item }}"
    content: "{{ item.content | b64decode }}"
    owner: root
    group: root
    mode: 0600
  no_log: true
  register: copy_kubeadm_certs
  with_items: "{{ kubeadm_certs.results }}"
  when: inventory_hostname != groups['kube-master']|first

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

- name: kubeadm | Init other uninitialized masters
  command: timeout -k 600s 600s {{ bin_dir }}/kubeadm init --config={{ kube_config_dir }}/kubeadm-config.yaml --ignore-preflight-errors=all
  register: kubeadm_init
  retries: 10
  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
  notify: Master | restart kubelet

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

- name: kubeadm | Check apiserver key again
  stat:
    path: "{{ kube_cert_dir }}/apiserver.key"
  register: apiserver_key_after
  delegate_to: "{{groups['kube-master']|first}}"
  run_once: true

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

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

- 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