Helm with Kubernetes Namespaces

Step-01: Introduction

• Any resource we manage using HELM are specific to Kubernetes Namespace
• By default, Kubernetes resources deployed to k8s cluster using default namespace, so we don't need to specify namespace name explicitly
• In the case if we want to deploy k8s resources to a namespace (other than default), then we need to specify that in helm install command with flag --namespace or -n
• In addition, we can also create a namespace during helm install using flags --namespace --create-namespace

Step-02: Install Helm Release by creating Kubernetes Namespace dev

# List Kubernetes Namespaces 
kubectl get ns

# Install Helm Release by creating Kubernetes Namespace
helm install dev101 stacksimplify/mychart2 --version "0.1.0" --namespace dev --create-namespace 

# List Kubernetes Namespaces 
kubectl get ns
Observation: Found the dev namespace created as part of `helm install`

# List Helm Release
helm list --> NO RELEASES in default namespace
helm list -n dev
helm list --namespace dev

# Helm Status
helm status dev101 --show-resources -n dev
helm status dev101 --show-resources --namespace dev

# List Kubernetes Pods
kubectl get pods -n dev
kubectl get pods --namespace dev

# List Services
kubectl get svc -n dev

# List Deployments
kubectl get deploy -n dev

# Access Application
http://localhost:31232

Step-03: Run helm upgrade for resources present in dev namespace

# Helm Upgrade
helm upgrade dev101 stacksimplify/mychart2 --version "0.2.0" --namespace dev 
or
helm upgrade dev101 stacksimplify/mychart2 --version "0.2.0" -n dev

# List Helm Release
helm list -n dev
helm list --namespace dev

# Helm Status
helm status dev101 --show-resources -n dev
helm status dev101 --show-resources --namespace dev

# Access Application
http://localhost:31232

Step-04: Uninstall Helm Release from dev Namespace

# Uninstall Helm Releas
helm uninstall dev101 --namespace dev
helm uninstall dev101 -n dev

# List Helm Release
helm list -n dev
helm list --namespace dev

# List Kubernetes Namespaces
kubectl get ns
Observation: 
1. When uninstalling helm release, it will not delete the Kubernetes Resource: dev namespace. 
2. If we dont need that dev namespace we need to manually delete it from kubernetes using kubectl

# Delete dev namespace
kubectl delete ns dev

# List Kubernetes Namespaces
kubectl get ns