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 | Check service account key
  stat:
    path: "{{ kube_cert_dir }}/sa.key"
  register: sa_key_before
  delegate_to: "{{groups['kube-master']|first}}"
  run_once: true

- name: kubeadm | Check if kubeadm has already run
  stat:
    path: "{{ kube_cert_dir }}/ca.key"
  register: kubeadm_ca

- name: kubeadm | Delete old admin.conf
  file:
    path: "{{ kube_config_dir }}/admin.conf"
    state: absent
  when: not kubeadm_ca.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: kubeadm | Create kubeadm config
  template:
    src: kubeadm-config.yaml.j2
    dest: "{{ kube_config_dir }}/kubeadm-config.yaml"
  register: kubeadm_config

- name: kubeadm | Initialize first master
  command: timeout -k 240s 240s {{ bin_dir }}/kubeadm init --config={{ kube_config_dir }}/kubeadm-config.yaml --skip-preflight-checks
  register: kubeadm_init
  # Retry is because upload config sometimes fails
  retries: 3
  when: inventory_hostname == groups['kube-master']|first and not kubeadm_ca.stat.exists
  failed_when: kubeadm_init.rc != 0 and "field is immutable" not in kubeadm_init.stderr
  notify: Master | restart kubelet

- name: kubeadm | Upgrade first master
  command: >-
    timeout -k 240s 240s
    {{ bin_dir }}/kubeadm
    upgrade apply -y {{ kube_version }}
    --config={{ kube_config_dir }}/kubeadm-config.yaml
    --skip-preflight-checks
    --allow-experimental-upgrades
    --allow-release-candidate-upgrades
  register: kubeadm_upgrade
  # Retry is because upload config sometimes fails
  retries: 3
  when: inventory_hostname == groups['kube-master']|first and (kubeadm_config.changed and kubeadm_ca.stat.exists)
  failed_when: kubeadm_upgrade.rc != 0 and "field is immutable" not in kubeadm_upgrade.stderr
  notify: Master | restart kubelet

# FIXME(mattymo): remove when https://github.com/kubernetes/kubeadm/issues/433 is fixed
- name: kubeadm | Enable kube-proxy
  command: "{{ bin_dir }}/kubeadm alpha phase addon kube-proxy --config={{ kube_config_dir }}/kubeadm-config.yaml"
  when: inventory_hostname == groups['kube-master']|first
  changed_when: false

- 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: 0700
  no_log: true
  register: copy_kubeadm_certs
  with_items: "{{ kubeadm_certs.results }}"
  when: inventory_hostname != groups['kube-master']|first

- name: kubeadm | Init other uninitialized masters
  command: timeout -k 240s 240s {{ bin_dir }}/kubeadm init --config={{ kube_config_dir }}/kubeadm-config.yaml --skip-preflight-checks
  register: kubeadm_init
  when: inventory_hostname != groups['kube-master']|first and not kubeadm_ca.stat.exists
  failed_when: kubeadm_init.rc != 0 and "field is immutable" not in kubeadm_init.stderr
  notify: Master | restart kubelet

- name: kubeadm | Upgrade other masters
  command: >-
    timeout -k 240s 240s
    {{ bin_dir }}/kubeadm
    upgrade apply -y {{ kube_version }}
    --config={{ kube_config_dir }}/kubeadm-config.yaml
    --skip-preflight-checks
    --allow-experimental-upgrades
    --allow-release-candidate-upgrades
  register: kubeadm_upgrade
  when: inventory_hostname != groups['kube-master']|first and (kubeadm_config.changed and kubeadm_ca.stat.exists)
  failed_when: kubeadm_upgrade.rc != 0 and "field is immutable" not in kubeadm_upgrade.stderr
  notify: Master | restart kubelet

- name: kubeadm | Check service account key again
  stat:
    path: "{{ kube_cert_dir }}/sa.key"
  register: sa_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: sa_key_before.stat.checksum|default("") != sa_key_after.stat.checksum

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