Kubernetes - POD, Steps Installing Minikube, Kubectl and writing our first pod.yml file.

1. What is POD?

   A pod in kubernetes is a runtime specification of a container in docker. A pod provides more declerative way of defining using YAML and you can run more than one container in a pod.

   In k8's lowest level of deployment is a POD.

2. What is Minikube?

Minikube is a lightweight Kubernetes (K8) installation, which can create a Virtual Machine (VM) on your local machine or in a cloud instance, which deploys a simple cluster containing only one node.

3. What is Kubectl?

   As in docker we have docker CLI, sameway in k8s we have kubectl, a CLI tool for k8s to directly interact with k8s clusters.

4. Steps to install the requirements and deploying our app:

   Step 1: Create an AWS EC2 instance with Ubuntu 22

   Create an EC2 instance with Ubuntu 22.04 (the latest for the moment) operating system.

   Instance Size: t2.large with 2 CPUs, 32 GB Storage

   

   Step 2 : Install Docker

   Install Docker on the Ubuntu EC2 instance created under Step 1.

   

   Step 3 : Install Kubectl

   

   Step 4: Install Minikube

   Once both Docker and Kubectl are installed, you may use following set of commands to install Minikube.

   

   curl -LO storage.googleapis.com/minikube/releases/la..

   sudo install minikube-linux-amd64 /usr/local/bin/minikube && rm minikube-linux-amd64

   Step 5: Start Minikube

   Use the following command to start Minikube

   $ minikube start

   

   $ minikube status

   

Step 6: Writing our first pod.yml file for nginx.

To check pods are running:

kubectl get pods // kubectl get pods -o wide

Step 7: To see running the image nginx:1.14.2

minikube ssh && curl <ip address of your pod>

5. References and proper Documentations link:

   1. Minikube: https://minikube.sigs.k8s.io/docs/

   2. Installing Docker on Ubuntu 22.04 : https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-22-04

   3. Installing Kubectl on Linux: https://kubernetes.io/docs/tasks/tools/install-kubectl-linux/

   4. Installing Minikube: https://minikube.sigs.k8s.io/docs/start /

   5. Kubernetes Pod Doc: https://kubernetes.io/docs/concepts/workloads/pods/