Add ansible configuration for installing kubernetes on master and wor…

…ker VMS

.gitignore

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+ansible/tmp

ansible/ansible.cfg

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+[defaults]
+# disable host_key_checking
+# https://docs.ansible.com/ansible/latest/user_guide/connection_details.html#host-key-checking
+host_key_checking = False
+
+inventory=inventory

ansible/install_kubernetes.yaml

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+---
+- name: Install kubernetes on master and workers
+  hosts: [masters, workers]
+  remote_user: kubenode
+  become: yes
+  become_method: sudo
+  become_user: root
+  gather_facts: yes
+  connection: ssh
+
+  tasks:
+
+    - name: Disable  swap
+      command: swapoff -a
+
+    - name: Remove swap entry in fstab
+      lineinfile:
+        dest: /etc/fstab
+        regexp: swap
+        state: absent
+
+    - name: Install prerequisites
+      apt:
+        name:
+          - apt-transport-https
+          - ca-certificates
+          - curl
+          - software-properties-common
+        state: present
+
+    - name: Install docker
+      apt:
+        name:
+          - docker.io
+        state: present
+
+    - name: Enable Docker service
+      service:
+        name: docker
+        enabled: yes
+
+    - name: Add Google official GPG key
+      apt_key:
+        url: https://packages.cloud.google.com/apt/doc/apt-key.gpg
+        state: present
+
+    - name: Add kubernetes repository
+      apt_repository:
+        repo: deb https://apt.kubernetes.io/ kubernetes-xenial main
+        state: present
+        filename: kubernetes
+        mode: 0600
+
+    - name: Install Kubernetes
+      apt:
+        name:
+          - kubelet
+          - kubeadm
+          - kubectl
+        state: present
+
+    - name: Enable Kubernetes service
+      service:
+        name: kubelet
+        enabled: yes
+
+    - name: Reboot
+      reboot:
+        post_reboot_delay: 10
+        reboot_timeout: 60
+        connect_timeout: 60
+        test_command: uptime
+

ansible/inventory/servers

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+[masters]
+master ansible_host=192.168.0.13 ansible_user=kubenode ansible_ssh_pass=12345678 ansible_port=22
+
+[workers]
+worker ansible_host=192.168.0.14 ansible_user=kubenode ansible_ssh_pass=12345678 ansible_port=22

ansible/setup_kubernetes_cluster.yaml

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+---
+- name: Initialize and setup Kubernetes cluster
+  hosts: masters
+  remote_user: kubenode
+  become: yes
+  become_method: sudo
+  become_user: root
+  gather_facts: yes
+  connection: ssh
+
+  tasks:
+    - name: Initialize Kubernetes cluster
+      command: kubeadm init --pod-network-cidr=192.168.1.0/24 --apiserver-advertise-address=192.168.0.13
+      run_once: true
+
+    - pause: seconds=30
+
+    - name: Create directory for kube config
+      become_user: kubenode
+      become_method: sudo
+      become: yes
+      file:
+        path: /home/kubenode/.kube
+        state: directory
+        owner: "kubenode"
+        group: "kubenode"
+        mode: 0755
+
+    - name: Copy admin.conf to .kube/config
+      become_user: root
+      become_method: sudo
+      become: yes
+      copy:
+        src: /etc/kubernetes/admin.conf
+        dest: /home/kubenode/.kube/config
+        remote_src: yes
+        owner: "kubenode"
+        group: "kubenode"
+        mode: 0644
+
+    - name: Remove the cache directory
+      become_user: kubenode
+      become_method: sudo
+      become: yes
+      file: 
+        path: /home/kubenode/.kube/cache
+        state: absent
+
+    - name: Create Pod Network
+      become_user: kubenode
+      become_method: sudo
+      become: yes
+      command: "{{ item }}"
+      with_items:
+        - kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
+
+    - name: Get the token for joining nodes to the cluster
+      shell: kubeadm token create --print-join-command
+      register: kubernetes_join_command
+
+    - debug:
+        msg: "{{ kubernetes_join_command.stdout }}"
+
+    - name: Create tmp folder to store temporary files
+      delegate_to: localhost
+      file:
+        path: tmp
+        state: directory
+
+    - name: Copy join command to local file.
+      delegate_to: localhost
+      copy:
+        content: "{{ kubernetes_join_command.stdout_lines[0] }}"
+        dest: tmp/kubernetes_join_command
+        mode: 0777

ansible/setup_kubernetes_workers.yaml

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+---
+- name: Join workers to Kubernetes cluster
+  hosts: workers
+  remote_user: kubenode
+  become: yes
+  become_method: sudo
+  become_user: root
+  gather_facts: yes
+  connection: ssh
+
+  tasks:
+    - name: Copy join command to worker nodes
+      copy:
+        src: tmp/kubernetes_join_command
+        dest: /tmp/kubernetes_join_command
+        mode: 0777
+
+    - name: Join the worker nodes to the cluster
+      command: sh /tmp/kubernetes_join_command
+      register: joined_or_not
+
+    - debug:
+        msg: "{{ joined_or_not.stdout }}"