Add cluster setup with Vagrant

hands-on/vagrant/.gitignore

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+.vagrant

hands-on/vagrant/README.md

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+# Vagrant
+
+We've created the automation to initialize cluster in your local machine using Vagrant, Ansible and kubeadm. You just need execute the following command and make sure Vagrant, Ansible are installed on your system.
+
+```
+$ vagrant up
+# Once cluster done, you can ssh into each node
+$ vagrant ssh master # or worker1 or worker2
+
+# List all pods in the cluster
+vagrant@master:~$ kubectl get po -A
+```

hands-on/vagrant/Vagrantfile

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+base = "ubuntu/bionic64"
+
+Vagrant.configure("2") do |config|
+    config.ssh.insert_key = false
+    config.vm.provider "virtualbox" do |v|
+        v.memory = 2048
+        v.cpus = 2
+    end
+
+    config.vm.define "master" do |master|
+        master.vm.box = base
+        master.vm.network "private_network", ip: "10.18.0.11"
+        master.vm.hostname = "cluster-master"
+        master.vm.provision "ansible" do |ansible|
+            ansible.playbook = "main.yml"
+            ansible.extra_vars = {
+                node: "master",
+                node_ip: "10.18.0.11",
+            }
+        end
+    end
+
+    (1..2).each do |i|
+        config.vm.define "worker#{i}" do |worker|
+            worker.vm.box = base
+            worker.vm.network "private_network", ip: "10.18.0.#{i + 11}"
+            worker.vm.hostname = "cluster-worker#{i}"
+            worker.vm.provision "ansible" do |ansible|
+                ansible.playbook = "main.yml"
+                ansible.extra_vars = {
+                    node: "worker",
+                    node_ip: "10.18.0.#{i + 11}",
+                }
+            end
+        end
+    end
+end

hands-on/vagrant/ansible.cfg

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+[defaults]
+inventory = hosts
+host_key_checking = False
+callback_whitelist = timer, profile_tasks

hands-on/vagrant/hosts

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+[local]
+localhost   ansible_connection=local

hands-on/vagrant/join

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+kubeadm join cluster-master:6443 --token wxnidi.3sheyw4kjtrw2pbi     --discovery-token-ca-cert-hash sha256:c80e54d13e8f1b1f4a277a22df60cb3693f362b3ab9649df6699751decd80072 

hands-on/vagrant/main.yml

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+---
+- name: Installation and Configuration cluster
+  hosts: all
+  become: yes
+  gather_facts: True
+
+  vars_files:
+    - vars/main.yml
+
+  roles:
+    - general
+    - { role: master, when: node == "master"}
+    - { role: worker, when: node == "worker"}

hands-on/vagrant/roles/general/tasks/01-install.yml

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+- name: Update and upgrade apt packages
+  apt:
+    upgrade: dist
+    update_cache: yes
+
+- name: Install required package
+  apt:
+    name:
+      - apt-transport-https
+      - ca-certificates
+      - curl
+      - gnupg-agent
+      - software-properties-common
+    state: present
+    update_cache: yes
+
+- name: Copy bridge configuration
+  template:
+    src: templates/kubernetes.conf.j2
+    dest: "/etc/sysctl.d/kubernetes.conf"
+
+- name: Update sysctl configuration
+  shell: sysctl --system
+
+- name: Add an apt signing key for Docker
+  apt_key:
+    url: https://download.docker.com/linux/ubuntu/gpg
+    state: present
+
+- name: Add apt repository for stable version
+  apt_repository:
+    repo: deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable
+    state: present
+
+- name: Install docker and its dependecies
+  apt: 
+    name: docker-ce
+    state: present
+    update_cache: yes
+
+- name: Copy docker configuration
+  template:
+    src: templates/daemon.json.j2
+    dest: "/etc/docker/ddaemon.json"
+
+- name: Add vagrant users to docker group
+  user:
+    name: vagrant
+    groups: docker
+    append: yes
+
+- name: Remove swapfile
+  mount:
+    name: "{{ item }}"
+    fstype: swap
+    state: absent
+  with_items:
+    - swap
+    - none
+
+- name: Disable swap
+  shell: swapoff -a
+
+- name: Add an apt signing key for Kubernetes
+  apt_key:
+    url: https://packages.cloud.google.com/apt/doc/apt-key.gpg
+    state: present
+
+- name: Adding apt repository for Kubernetes
+  apt_repository:
+    repo: deb https://apt.kubernetes.io/ kubernetes-xenial main
+    state: present
+    filename: kubernetes.list
+
+- name: Install Kubernetes binaries
+  apt: 
+    name: "{{ item }}={{ k8s_version }}-00"
+    state: present
+    update_cache: yes
+  with_items:
+    - kubelet
+    - kubeadm
+    - kubectl

hands-on/vagrant/roles/general/tasks/02-config.yml

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+- name: Load overlay and br_netfilter modules
+  shell: |
+    modprobe overlay
+    modprobe br_netfilter
+
+- name: Copy bridge configuration
+  template:
+    src: templates/kubernetes.conf.j2
+    dest: "/etc/sysctl.d/kubernetes.conf"
+
+- name: Update sysctl configuration
+  shell: sysctl --system
+
+- name: Copy docker configuration
+  template:
+    src: templates/daemon.json.j2
+    dest: "/etc/docker/ddaemon.json"
+
+- name: Add DNS alias to each node
+  shell: |
+    cat >> /etc/hosts <<EOF
+    10.18.0.11 cluster-master
+    10.18.0.12 cluster-worker1
+    10.18.0.13 cluster-worker2
+    EOF
+
+- name: Fix kubelet IP
+  shell: echo 'Environment="KUBELET_EXTRA_ARGS=--node-ip={{ node_ip }}"' | tee -a /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
+
+- name: Clear memory cache
+  shell: sync; echo 3 > /proc/sys/vm/drop_caches 

hands-on/vagrant/roles/general/tasks/03-service.yml

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+---
+- name: Restart docker service
+  service:
+    name: docker
+    state: restarted
+    daemon_reload: yes
+    enabled: yes
+
+- name: Restart kubelet service
+  service:
+    name: kubelet
+    state: restarted
+    daemon_reload: yes
+    enabled: yes

hands-on/vagrant/roles/general/tasks/main.yml

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+---
+- include_tasks: 01-install.yml
+- include_tasks: 02-config.yml
+- include_tasks: 03-service.yml

hands-on/vagrant/roles/general/templates/daemon.json.j2

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+{
+    "exec-opts": ["native.cgroupdriver=systemd"],
+    "log-driver": "json-file",
+    "storage-driver": "overlay2"
+}

hands-on/vagrant/roles/general/templates/kubernetes.conf.j2

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+net.ipv4.ip_forward = 1
+net.bridge.bridge-nf-call-ip6tables = 1
+net.bridge.bridge-nf-call-iptables = 1

hands-on/vagrant/roles/master/tasks/main.yml

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+---
+- name: Initialize the cluster using kubeadm
+  shell: kubeadm init --control-plane-endpoint="cluster-master:6443" --node-name {{ ansible_hostname }} --pod-network-cidr=192.168.0.0/16
+
+- name: Setup cluster config on master node
+  shell: |
+    mkdir -p /home/vagrant/.kube
+    cp -i /etc/kubernetes/admin.conf /home/vagrant/.kube/config
+    chown vagrant:vagrant /home/vagrant/.kube/config
+
+- name: Generate join command
+  command: kubeadm token create --print-join-command
+  register: join_command
+
+- name: Copy join command
+  local_action: copy content="{{ join_command.stdout_lines[0] }}" dest="./join"
+  become: false
+
+- name: Deploy flannel to cluster
+  shell: kubectl --kubeconfig /home/vagrant/.kube/config create -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
+  when: network == "flannel"

hands-on/vagrant/roles/worker/tasks/main.yml

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+- name: Copy join command to node
+  copy: 
+    src: join
+    dest: /tmp/join
+    mode: 0777
+
+- name: Join the node to cluster
+  shell: sh /tmp/join

hands-on/vagrant/vars/main.yml

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+---
+k8s_version: "1.19.1"
+network: "flannel"