geerlingguy.ansible-role-kubernetes/tasks/master-setup.yml

---
- name: Initialize Kubernetes master with kubeadm init.
  command: >
    kubeadm init
    --pod-network-cidr={{ kubernetes_pod_network_cidr }}
    --apiserver-advertise-address={{ kubernetes_apiserver_advertise_address | default(ansible_default_ipv4.address) }}
    --kubernetes-version {{ kubernetes_version_kubeadm }}
    --ignore-preflight-errors={{ kubernetes_ignore_preflight_errors }}
    {{ kubernetes_kubeadm_init_extra_opts }}    

  register: kubeadmin_init
  failed_when: false
  when: kubernetes_init_stat.stat.exists == false

- name: Print the init output to screen.
  debug:
    var: kubeadmin_init.stdout
    verbosity: 2
  when: kubernetes_init_stat.stat.exists == false

- name: Ensure .kube directory exists.
  file:
    path: ~/.kube
    state: directory

- name: Symlink the kubectl admin.conf to ~/.kube/conf.
  file:
    src: /etc/kubernetes/admin.conf
    dest: ~/.kube/config
    state: link

- name: Configure Flannel networking.
  command: "{{ item }}"
  with_items:
    - kubectl apply -f {{ kubernetes_flannel_manifest_file_rbac }}
    - kubectl apply -f {{ kubernetes_flannel_manifest_file }}
  register: flannel_result
  changed_when: "'created' in flannel_result.stdout"

# TODO: Check if taint exists with something like `kubectl describe nodes`
# instead of using kubernetes_init_stat.stat.exists check.
- name: Allow pods on master node (if configured).
  command: "kubectl taint nodes --all node-role.kubernetes.io/master-"
  when:
    - kubernetes_allow_pods_on_master
    - kubernetes_init_stat.stat.exists == false

- name: Check if Kubernetes Dashboard UI service already exists.
  shell: kubectl get services --namespace kube-system | grep -q kubernetes-dashboard
  changed_when: false
  failed_when: false
  register: kubernetes_dashboard_service
  when: kubernetes_enable_web_ui

- name: Enable the Kubernetes Web Dashboard UI (if configured).
  command: "kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml"
  when:
    - kubernetes_enable_web_ui
    - kubernetes_dashboard_service is failed