digitalocean-kubernetes-1-10-cluster-using-kubeadm-on-ubuntu-16-04

a-k8s-cluster-on-DO-with-ansible.sh

brew upgrade ansible
mkdir -p /Users/richardsonlima/k8s-digitalocean-ansible/kube-cluster
ssh-add ~/.ssh/id_rsa # avoiding ssh key phrase dialog
ansible-playbook -i hosts ~/k8s-digitalocean-ansible/kube-cluster/initial.yml
ansible-playbook -i hosts ~/k8s-digitalocean-ansible/kube-cluster/kube-dependencies.yml
ansible-playbook -i hosts ~/k8s-digitalocean-ansible/kube-cluster/master.yml
ansible-playbook -i hosts ~/k8s-digitalocean-ansible/kube-cluster/workers.yml
kubectl get nodes
kubectl get po --all-namespaces

# on master
kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml --namespace=kube-system

READMORE: https://github.com/hobby-kube/guide

hosts

[masters]
k8s-master-01 ansible_host=138.68.105.215 ansible_user=root

[workers]
k8s-worker-01 ansible_host=207.154.253.20 ansible_user=root
k8s-worker-02 ansible_host=165.227.166.1 ansible_user=root

[all:vars]
ansible_python_interpreter=/usr/bin/python3

initial.yml

- hosts: all
  become: yes
  tasks:
    - name: create the 'richardson' user
      user: name=richardson append=yes state=present createhome=yes shell=/bin/bash

    - name: allow 'richardson' to have passwordless sudo
      lineinfile:
        dest: /etc/sudoers
        line: 'richardson ALL=(ALL) NOPASSWD: ALL'
        validate: 'visudo -cf %s'

    - name: set up authorized keys for the richardson user
      authorized_key: user=richardson key="{{item}}"
      with_file:
        - ~/.ssh/id_rsa.pub

kube-dependencies.yml

- hosts: all
  become: yes
  tasks:
   - name: install Docker
     apt:
       name: docker.io
       state: present
       update_cache: true

   - name: install APT Transport HTTPS
     apt:
       name: apt-transport-https
       state: present

   - name: add Kubernetes apt-key
     apt_key:
       url: https://packages.cloud.google.com/apt/doc/apt-key.gpg
       state: present

   - name: add Kubernetes' APT repository
     apt_repository:
      repo: deb http://apt.kubernetes.io/ kubernetes-xenial main
      state: present
      filename: 'kubernetes'

   - name: install kubelet
     apt:
       name: kubelet
       state: present
       update_cache: true

   - name: install kubeadm
     apt:
       name: kubeadm
       state: present

- hosts: master
  become: yes
  tasks:
   - name: install kubectl
     apt:
       name: kubectl
       state: present

master.yml

- hosts: masters
  become: yes
  tasks:
    - name: initialize the cluster
      shell: kubeadm init --pod-network-cidr=10.244.0.0/16 >> cluster_initialized.txt
      args:
        chdir: $HOME
        creates: cluster_initialized.txt

    - name: create .kube directory
      become: yes
      become_user: richardson
      file:
        path: $HOME/.kube
        state: directory
        mode: 0755

    - name: copy admin.conf to user's kube config
      copy:
        src: /etc/kubernetes/admin.conf
        dest: /home/richardson/.kube/config
        remote_src: yes
        owner: richardson

    - name: install Pod network
      become: yes
      become_user: richardson
      shell: kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml >> pod_network_setup.txt
      args:
        chdir: $HOME
        creates: pod_network_setup.txt

workers.yml

- hosts: master
  become: yes
  gather_facts: false
  tasks:
    - name: get join command
      shell: kubeadm token create --print-join-command
      register: join_command_raw

    - name: set join command
      set_fact:
        join_command: "{{ join_command_raw.stdout_lines[0] }}"


- hosts: workers
  become: yes
  tasks:
    - name: join cluster
      # https://docs.ansible.com/ansible/latest/user_guide/playbooks_filters.html
      # shell: "{{ hostvars['master'].join_command }} >> node_joined.txt"
      shell: "{{ groups['master']|map('extract', hostvars, 'join_command') }}  >> node_joined.txt"
      args:
        chdir: $HOME
        creates: node_joined.txt