HELM CHART FOR WORDPRESS PHP APPLICATION AND MYSQL DATABASE ON K8S:-

WHAT IS HELM CHART?

Helm is the tool for package manager i.e. chart just like roles in ansible. We can put all the resources i.e. YAML template files organized into a specific directory structure. A Helm chart can contain any number of Kubernetes or any other technological objects, all of which are deployed as part of the chart.

There are two ways to create chart:-

1) Repository

2) Custom Chart

There are two versions i.e. v2 and v3:-

1) v2 includes tiller program to connect client with server.

2) v3 not includes tiller program to connect client with server.

Task Description:-

📌 Create a Helm chart on any Technology learnt.

Let's start...

STEP 1:- Configure Multi-Node K8s Cluster on AWS EC2 Instances having 1 Master and 2 Worker Nodes.

STEP 2:- Install helm.

wget https://get.helm.sh/helm-v3.5.2-linux-amd64.tar.gz

tar -xvzf helm-v3.5.2-linux-amd64.tar.gz

cp linux-amd64/helm /usr/bin/

helm

helm version

cd .kube/ should contain config file.

STEP 3:- Create workspace /ws and then create helm chart myapp in it.

vim Chart.yaml

mkdir templates

kubectl run mywp --image=wordpress:5.1.1-php7.3-apache --dry-run -o yaml > wordpress.yaml

kubectl run mydb --image=mysql:5.7 --dry-run -o yaml > mysql.yaml

kubectl expose pod mywp --port=80 --type=NodePort --dry-run -o yaml > service.yaml

vim values.yaml

STEP 4:- Install helm providing name myapp.

Note that myapp is the name of the helm chart and /ws/myapp/ is the directory name inside which helm chart has been put.

helm install myapp /ws/myapp/

STEP 5:- Check that mywp and mydb pod has been launched and mywp has been exposed.

kubectl get pods -o wide

kubectl get svc

helm list

STEP 6:- Access the WordPress PHP Application having MySQL Database connected.

Using public IP and exposed port no. of K8s-Master we can see that WordPress connected with MySQL has been launched.

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