Features:

• A vagrantfile to Manage 3 VMs For Kubernertes Clusters (1 Control node and 2 worker nodes)
• Ansible playbook to automate the deployment the K8s clusters in the vagrant
• A simple Voting App deployed as containers into the kubernetes clusters
• Username and Password Encrypted and stored as Kubernetes Secrets
• Persistence DB with Persitence Volume and PVC
• Application Scalability provided by Horizontal Pod AutoScaler (HPA with minimum replica of 1 and Maximum Replicas of 4 with Metrics of cpuUtilization)
• GitHub Workflow to Manage Code Scanning (with CodeQL) before Merging Pull requests
• Infrastrucure Automation using Ansible (This is used to install all the dependencies for the k8s Clusters)

Prerequisites

• A Linux workstation (I am using Ubuntu 20.10) with At least 8 GB of RAM and 15 GB of free hard disk space for the virtual machines.

lsb_release -a

• Vagrant

sudo apt install vagrant

• VirtualBox

sudo apt install virtualbox

• Ansible

sudo apt-add-repository --yes --update ppa:ansible/ansible

sudo apt install ansible

** File Structure

This code used to create a Kubernetes Cluster with Vagrant and Ansible is composed of:

• .vagrant/: Hidden directory for Vagrant tracking. It includes a Vagrant generated Inventory file: vagrant_ansible_inventory that is used by Ansible to match virtual machines and roles. add_packages: Ansible playbook to install/remove packages using APT in an Ubuntu system.

• roles/

• common/: Installs the needed packages for Kubernetes (delegating in add_packages) and configures the common settings for Kubernetes master and nodes.

• k8s/master/: Ansible playbook to configure a Kubernetes master, it uses the common playbook for shared components between the Kubernetes master and the nodes.

• k8s/node/: Ansible playbook to configure a Kubernetes node, it uses the common playbook for shared components between the Kubernetes master and the nodes.

• k8s.yml: Ansible playbook that uses the Kubernetes ansible roles.

• ditwl-k8s-01-join-command: this file is generated by the Kubernetes master and includes a temporary token and the command needed to join Kubernetes nodes to the cluster.

• Vagrantfile: contains the definition of the machines (CPU, memory, network and Ansible playbook and properties)

To spin up the infrastructure run, clone this repo cd to the vagrant folder and vagrant up

git clone https://github.com/avurlerby/automation.git

cd vagrant-ansible-infra && vagrant up

This will deploy vagrant and spin up the kubernetes clusters and configure the whole boostrapping using ansible

Kubernetes Network Overview

After installing a Kubernetes Cluster it is recommended to:

• Check the health of the cluster
• Check networking status

Connect to kubernetes Cluster on the Vagrant

ssh k8s-m-1

To check that all the necessary pods and services are running

kubectl get pods –all-namespaces

List the Kubernetes cluster nodes using kubectl from your development host:

kubectl cluster-info

Deploy the Voter Application Microservices

kubectl create -f /voting-app/k8s-specifications

This will deploy the voting app into the kubernetes clusters in the vagrant.

Check if the pods are running:

kubectl get po -n vote

Thank you !