Add Week-4 K8s

Phase-1-Practices/Week-4/Vu-Thanh-Trung/Kubernetes.md

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+# Practice: Deploy Wordpress + MariaDB on Kubernetes using Minikube
+
+## Table of Contents
+
+- [I. About Kubernetes](#I-About-Kubernetes)
+
+- [II. Practice](#II-Practice)
+
+  - [1. Minikube & kubectl](#1-Minikube-&-kubectl)
+
+  - [2. Deploy Wordpress using Helm](#2-Deploy-Wordpress-using-Helm)
+
+## I. About Kubernetes
+
+- [What is Kubernetes?](https://kubernetes.io/docs/concepts/overview/what-is-kubernetes/)
+
+- [Install and Set Up kubectl on Linux](https://kubernetes.io/docs/tasks/tools/install-kubectl-linux/)
+
+- [Kubectl Cheat Sheet](https://kubernetes.io/docs/reference/kubectl/cheatsheet/)
+
+## II. Practice
+
+**Note:** Here we have 2 ways to deploy Wordpress. You can choose either
+
+- Writing `.yaml` file
+
+or
+
+- Using [Helm](https://helm.sh/)
+
+Using *Helm Charts* should be slightly easier since "Charts are easy to create, version, share, and publish - so start using Helm and stop the copy-and-paste".
+
+### 1. Minikube & kubectl
+
+- Install required packages
+
+```console
+sudo apt update
+sudo apt install curl
+sudo apt install docker.io
+```
+
+- Install `minikube`
+
+```console
+curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
+sudo install minikube-linux-amd64 /usr/local/bin/minikube
+```
+
+- Install `kubectl`
+
+```console
+curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
+sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl
+```
+
+- Add user to the 'docker' group
+
+```console
+sudo user mod -aG docker $USER && newgrp docker
+```
+
+### 2. Deploy Wordpress using `Helm`
+
+- [Instruction link](https://www.bogotobogo.com/DevOps/Docker/Docker_Helm_Chart_WordPress_MariaDB_Minikube_with_Ingress.php)
+
+- Install `helm`
+
+```console
+sudo snap install helm --classic
+```
+
+- minikube start
+
+```console
+minikube start --driver=docker
+```
+
+![Kubernetes (1) minikube-start](https://user-images.githubusercontent.com/48465162/120060269-0a3cc100-c081-11eb-8367-3a7c243333e1.png)
+
+- Add Bitnami repo:
+
+```console
+helm repo add bitnami https://charts.bitnami.com/bitnami
+```
+
+- Check repo list:
+
+``` console
+helm repo list
+```
+
+- Install and deploy wordpress
+
+```console
+helm install my-release \
+  --set wordpressUsername=admin \
+  --set wordpressPassword=password \
+  --set mariadb.auth.rootPassword=secretpassword \
+    bitnami/wordpress
+```
+
+![Kubernetes (2) install-release](https://user-images.githubusercontent.com/48465162/120060273-0f9a0b80-c081-11eb-98ae-c436622547ef.png)
+
+- (Optional) Check pods, svc, deployment, pv, pvc, secrets,...
+
+```console
+kubectl get pods
+kubectl get svc
+kubectl get deployment
+kubectl get pv
+kubectl get pvc
+kubectl get secrets
+helm list
+```
+
+- Get deployment url
+
+```console
+minikube service my-release-wordpress --url
+```
+
+![Kubernetes (3) get-url](https://user-images.githubusercontent.com/48465162/120060289-19237380-c081-11eb-94ff-f14b0e5fe9c9.png)
+
+- Access the result link
+
+![Kubernetes (4) result](https://user-images.githubusercontent.com/48465162/120060291-1c1e6400-c081-11eb-894a-d8a09eff3615.png)