geerlingguy.ansible-role-kubernetes/tasks/main.yml

---
- include_tasks: setup-RedHat.yml
  when: ansible_os_family == 'RedHat'

- include_tasks: setup-Debian.yml
  when: ansible_os_family == 'Debian'

- name: Ensure depdencies are installed.
  package: name=curl state=present

- name: Install Kubernetes packages.
  package:
    name: "{{ item.name | default(item) }}"
    state: "{{ item.state | default('present') }}"
  notify: restart kubelet
  with_items: "{{ kubernetes_packages }}"

- name: Allow kubelet to run with swap enabled (if configured).
  lineinfile:
    path: /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
    line: 'Environment="KUBELET_EXTRA_ARGS=--fail-swap-on=false"'
    regexp: 'Environment="KUBELET_EXTRA_ARGS=--fail-swap-on.+'
    insertafter: '^Environment='
    state: present
  when: kubernetes_allow_swap

- name: Ensure kubelet is started and enabled at boot.
  service:
    name: kubelet
    state: started
    enabled: yes

- name: Check if Kubernetes has already been initialized.
  stat:
    path: /etc/kubernetes/admin.conf
  register: kubernetes_init_stat

- name: Initialize the Kubernetes master with kubeadm init.
  command: >
    kubeadm init
    --pod-network-cidr=10.0.1.0/16
    --apiserver-advertise-address={{ ansible_default_ipv4.address }}
    --kubernetes-version stable-1.10
    --ignore-preflight-errors=all
  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
  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 https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
    - kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/k8s-manifests/kube-flannel-rbac.yml

# 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
  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