Tutorial: The Basics

This guide is aimed to fast-track your Kubernetes learning by focusing on a practical hands-on overview guide.

The problem: "I want to adopt Kubernetes"
The problem: "I have some common existing infrastructure"

Our focus: Solving the problem by learning each building block in order to port our infrastructure to Kubernetes.

Docker installation

Install Docker here

Run Kubernetes

Install kubectl to work with kubernetes

We'll head over to the kubernetes site to download kubectl

Install the kind binary

You will want to head over to the kind site

Create a cluster

kind create cluster

Namespaces

kubectl create namespace cms

Deployments

Deployment documentation

cd kubernetes\tutorial

kubectl -n cms apply -f deploy.yaml
kubectl -n cms get pods

kubectl -n cms port-forward <pod-name> 80

Environment Variables for pods

Secrets

kubectl -n cms create secret generic wordpress `
--from-literal WORDPRESS_DB_HOST=mysql `
--from-literal WORDPRESS_DB_USER=exampleuser `
--from-literal WORDPRESS_DB_PASSWORD=examplepassword `
--from-literal WORDPRESS_DB_NAME=exampledb

kubectl -n cms get secret

How to use secrets in pods

Apply changes to our deployment

kubectl -n cms apply -f deploy.yaml

We can port-forward again, and notice an error connecting to the database because the database does not exist

Statefulset

Statefulset documentation

Storage Class

StorageClass documentation

Services

Services documentation

Let's deploy our mysql using what we learnt above:

kubectl -n cms apply -f .\statefulset.yaml

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