Add kubernetes cluster setup for ubuntu1804 playbooks

kubernetes_ubuntu1804/hosts

@@ -0,0 +1,8 @@
+[masters]
+master ansible_host=10.10.10.10 ansible_user=sammy
+
+[workers]
+worker1 ansible_host=10.10.10.10 ansible_user=sammy
+
+[all:vars]
+ansible_python_interpreter=/usr/bin/python3

kubernetes_ubuntu1804/initial.yml

@@ -0,0 +1,19 @@
+- hosts: all
+  become: yes
+  vars_files:
+    - vars/default.yml
+
+  tasks:
+    - name: create the 'ubuntu' user
+      user: name={{ create_user }} append=yes state=present createhome=yes shell=/bin/bash
+
+    - name: allow 'ubuntu' to have passwordless sudo
+      lineinfile:
+        dest: /etc/sudoers
+        line: '{{ create_user }} ALL=(ALL) NOPASSWD: ALL'
+        validate: 'visudo -cf %s'
+
+    - name: set up authorized keys for the ubuntu user
+      authorized_key: user={{ create_user }} key="{{item}}"
+      with_file:
+        - ~/.ssh/id_rsa_{{ inventory_hostname }}

kubernetes_ubuntu1804/kube-dependencies.yml

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+- 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=1.14.0-00
+       state: present
+       update_cache: true
+
+   - name: install kubeadm
+     apt:
+       name: kubeadm=1.14.0-00
+       state: present
+
+- hosts: master
+  become: yes
+  tasks:
+   - name: install kubectl
+     apt:
+       name: kubectl=1.14.0-00
+       state: present
+       force: yes

kubernetes_ubuntu1804/master.yml

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+- hosts: master
+  become: yes
+  vars_files:
+    - vars/default.yml
+  tasks:
+    - name: initialize the cluster
+      shell: kubeadm init --pod-network-cidr={{ pod_network_cidr }} >> cluster_initialized.txt
+      args:
+        chdir: $HOME
+        creates: cluster_initialized.txt
+
+    - name: create .kube directory
+      become: yes
+      become_user: "{{ create_user }}"
+      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/{{ create_user }}/.kube/config
+        remote_src: yes
+        owner: "{{ create_user }}"
+
+    - name: install Pod network
+      become: yes
+      become_user: "{{ create_user }}"
+      shell: kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml >> pod_network_setup.txt
+      args:
+        chdir: $HOME
+        creates: pod_network_setup.txt

kubernetes_ubuntu1804/vars/default.yml

@@ -0,0 +1,3 @@
+--
+pod_network_cidr: 10.244.0.0/25
+create_user: sammy

kubernetes_ubuntu1804/workers.yml

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+- 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
+      shell: "{{ hostvars['master'].join_command }} >> node_joined.txt"
+      args:
+        chdir: $HOME
+        creates: node_joined.txt
+