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Level 02 - Using Helm

Basics

Create a Chart

helm create hello-world

  • Chart.yaml: This is the main file that contains the description of our chart

  • values.yaml: this is the file that contains the default values for our chart

  • templates: This is the directory where Kubernetes resources are defined as templates

  • charts: This is an optional directory that may contain sub-charts

  • .helmignore: This is where we can define patterns to ignore when packaging (similar in concept to .gitignore)

Checkout values.yml

replicaCount: 1
image:
  repository: "nginx"
  tag: "1.0"
  pullPolicy: IfNotPresent
service:
  type: NodePort
  port: 80

Check Linting for all your chart

helm lint ./hello-world

Render Helm Template locally

helm template ./hello-world

Install the charts on local cluster

helm install --name hello-world ./hello-world

Check Helm Charts

helm ls --all

Upgrade Helm Charts

helm upgrade hello-world ./hello-world

Rollback for Helm Chart

helm rollback hello-world 1 # 1 is the version

Package

helm package ./hello-world/

Teardown Helm Chart

helm delete --purge hello-world

Helm Hub

Checkout Helm Hub.

Add Repo

helm repo add bitnami https://charts.bitnami.com

Install Wordpress Chart

Installation

helm install bitnami/wordpress --version 5.9.1

NOTES:
1. Get the WordPress URL:

  NOTE: It may take a few minutes for the LoadBalancer IP to be available.
        Watch the status with: 'kubectl get svc --namespace default -w esteemed-greyhound-wordpress'
  export SERVICE_IP=$(kubectl get svc --namespace default esteemed-greyhound-wordpress --template "{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}")
  echo "WordPress URL: http://$SERVICE_IP/"
  echo "WordPress Admin URL: http://$SERVICE_IP/admin"

2. Login with the following credentials to see your blog

  echo Username: user
  echo Password: $(kubectl get secret --namespace default esteemed-greyhound-wordpress -o jsonpath="{.data.wordpress-password}" | base64 --decode)

Check the Service

** WARNING: Use https:// instead of http:// 
https://192.168.99.100:30755/