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K8s setup with Vagrant and Ansible.
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‎.gitignore‎

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/.idea/
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/**/*.class
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/**/target/*
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/**/target/*
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/**/*.iml
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/kubernetes-basics/kubernetes-setup/.vagrant
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/kubernetes-basics/kubernetes-setup/kubeconf
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/**/join-command

‎kubernetes-basics/kubernetes-setup/README.asciidoc‎

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# Kubernetes Setup
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#### Prerequisites
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- Install link:../ansible-basics/README.asciidoc[Ansible].
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- Install VirtualBox and Vagrant.
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- Install https://github.com/ahmetb/kubectx[kubectx] to help with switching context.
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- Install https://github.com/derailed/k9s[k9s], UI to your cluster.
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#### Prepare K8s cluster with Vagrant and Ansible
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Inspired by https://kubernetes.io/blog/2019/03/15/kubernetes-setup-using-ansible-and-vagrant/
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#### Configure kubectl in your machine
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```
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# Extract kubecofig from master node
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vagrant ssh k8s-master -c "sudo cat /etc/kubernetes/admin.conf" > kubeconf
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# Add kubeconf path to $PATH
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# Note: KUBECONFIG only exposed to current terminal, to make it permanent add it to ~/.bashrc or /~.zshrc.
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export KUBECONFIG=kubeconf:$HOME/.kube/config
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```
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#### Verify
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```
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$ kubectl get nodes
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NAME STATUS ROLES AGE VERSION
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k8s-master Ready master 60m v1.18.2
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node-1 Ready <none> 57m v1.18.2
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node-2 Ready <none> 54m v1.18.2
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```
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‎kubernetes-basics/kubernetes-setup/Vagrantfile‎

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IMAGE_NAME = "bento/ubuntu-16.04"
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N = 2
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Vagrant.configure("2") do |config|
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config.ssh.insert_key = false
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config.vm.provider "virtualbox" do |v|
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v.memory = 1024
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v.cpus = 2
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end
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config.vm.define "k8s-master" do |master|
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master.vm.box = IMAGE_NAME
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master.vm.network "private_network", ip: "192.168.50.10"
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master.vm.hostname = "k8s-master"
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master.vm.provision "ansible" do |ansible|
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ansible.playbook = "master-playbook.yml"
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ansible.extra_vars = {
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node_ip: "192.168.50.10",
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}
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end
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end
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(1..N).each do |i|
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config.vm.define "node-#{i}" do |node|
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node.vm.box = IMAGE_NAME
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node.vm.network "private_network", ip: "192.168.50.#{i + 10}"
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node.vm.hostname = "node-#{i}"
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node.vm.provision "ansible" do |ansible|
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ansible.playbook = "node-playbook.yml"
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ansible.extra_vars = {
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node_ip: "192.168.50.#{i + 10}",
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}
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end
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end
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end
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end

‎kubernetes-basics/kubernetes-setup/master-playbook.yml‎

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---
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- hosts: all
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become: true
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tasks:
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- name: Install packages that allow apt to be used over HTTPS
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apt:
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name: "{{ packages }}"
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state: present
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update_cache: yes
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vars:
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packages:
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- apt-transport-https
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- ca-certificates
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- curl
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- gnupg-agent
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- software-properties-common
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- name: Add an apt signing key for Docker
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apt_key:
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url: https://download.docker.com/linux/ubuntu/gpg
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state: present
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- name: Add apt repository for stable version
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apt_repository:
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repo: deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable
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state: present
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- name: Install docker and its dependecies
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apt:
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name: "{{ packages }}"
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state: present
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update_cache: yes
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vars:
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packages:
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- docker-ce
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- docker-ce-cli
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- containerd.io
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notify:
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- docker status
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- name: Add vagrant user to docker group
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user:
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name: vagrant
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group: docker
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- name: Remove swapfile from /etc/fstab
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mount:
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name: "{{ item }}"
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fstype: swap
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state: absent
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with_items:
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- swap
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- none
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- name: Disable swap
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command: swapoff -a
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when: ansible_swaptotal_mb > 0
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- name: Add an apt signing key for Kubernetes
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apt_key:
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url: https://packages.cloud.google.com/apt/doc/apt-key.gpg
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state: present
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- name: Adding apt repository for Kubernetes
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apt_repository:
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repo: deb https://apt.kubernetes.io/ kubernetes-xenial main
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state: present
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filename: kubernetes.list
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- name: Install Kubernetes binaries
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apt:
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name: "{{ packages }}"
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state: present
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update_cache: yes
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vars:
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packages:
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- kubelet
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- kubeadm
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- kubectl
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- name: Configure node ip
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lineinfile:
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path: /etc/default/kubelet
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line: KUBELET_EXTRA_ARGS=--node-ip={{ node_ip }}
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create: yes
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- name: Restart kubelet
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service:
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name: kubelet
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daemon_reload: yes
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state: restarted
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- name: Initialize the Kubernetes cluster using kubeadm
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command: kubeadm init --apiserver-advertise-address=192.168.50.10 --apiserver-cert-extra-sans=192.168.50.10 --node-name k8s-master --pod-network-cidr=192.168.0.0/16
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- name: Setup kubeconfig for vagrant user
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command: "{{ item }}"
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with_items:
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- mkdir -p /home/vagrant/.kube
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- cp -i /etc/kubernetes/admin.conf /home/vagrant/.kube/config
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- chown vagrant:vagrant /home/vagrant/.kube/config
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- name: Install calico pod network
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become: false
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command: kubectl create -f https://docs.projectcalico.org/manifests/calico.yaml
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- name: Generate join command
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command: kubeadm token create --print-join-command
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register: join_command
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- name: Copy join command to local file
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become: false
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local_action: copy content="{{ join_command.stdout_lines[0] }}" dest="./join-command"
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handlers:
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- name: docker status
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service: name=docker state=started

‎kubernetes-basics/kubernetes-setup/node-playbook.yml‎

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---
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- hosts: all
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become: true
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tasks:
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- name: Install packages that allow apt to be used over HTTPS
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apt:
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name: "{{ packages }}"
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state: present
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update_cache: yes
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vars:
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packages:
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- apt-transport-https
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- ca-certificates
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- curl
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- gnupg-agent
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- software-properties-common
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- name: Add an apt signing key for Docker
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apt_key:
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url: https://download.docker.com/linux/ubuntu/gpg
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state: present
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- name: Add apt repository for stable version
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apt_repository:
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repo: deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable
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state: present
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- name: Install docker and its dependecies
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apt:
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name: "{{ packages }}"
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state: present
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update_cache: yes
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vars:
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packages:
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- docker-ce
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- docker-ce-cli
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- containerd.io
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notify:
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- docker status
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- name: Add vagrant user to docker group
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user:
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name: vagrant
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group: docker
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- name: Remove swapfile from /etc/fstab
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mount:
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name: "{{ item }}"
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fstype: swap
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state: absent
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with_items:
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- swap
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- none
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- name: Disable swap
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command: swapoff -a
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when: ansible_swaptotal_mb > 0
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- name: Add an apt signing key for Kubernetes
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apt_key:
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url: https://packages.cloud.google.com/apt/doc/apt-key.gpg
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state: present
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- name: Adding apt repository for Kubernetes
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apt_repository:
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repo: deb https://apt.kubernetes.io/ kubernetes-xenial main
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state: present
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filename: kubernetes.list
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- name: Install Kubernetes binaries
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apt:
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name: "{{ packages }}"
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state: present
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update_cache: yes
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vars:
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packages:
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- kubelet
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- kubeadm
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- kubectl
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- name: Configure node ip
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lineinfile:
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path: /etc/default/kubelet
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line: KUBELET_EXTRA_ARGS=--node-ip={{ node_ip }}
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create: yes
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- name: Restart kubelet
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service:
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name: kubelet
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daemon_reload: yes
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state: restarted
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- name: Copy the join command to server location
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copy: src=join-command dest=/tmp/join-command.sh mode=0777
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- name: Join the node to cluster
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command: sh /tmp/join-command.sh
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handlers:
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- name: docker status
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service: name=docker state=started

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