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Kubernetes Namespaces - Imperative using kubectl

Step-01: Introduction

  • Namespaces allow to split-up resources into different groups.
  • Resource names should be unique in a namespace
  • We can use namespaces to create multiple environments like dev, staging and production etc
  • Kubernetes will always list the resources from default namespace unless we provide exclusively from which namespace we need information from.

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Azure Kubernetes Service with Azure DevOps and Terraform

Step-02: Namespaces Generic - Deploy in Dev1 and Dev2

Create Namespace

# List Namespaces
kubectl get ns 

# Craete Namespace
kubectl create namespace <namespace-name>
kubectl create namespace dev1
kubectl create namespace dev2

# List Namespaces
kubectl get ns

Deploy All k8s Objects to default, dev1 and dev2 namespaces

# Deploy All k8s Objects
kubectl apply -f kube-manifests/  
kubectl apply -f kube-manifests/ -n dev1
kubectl apply -f kube-manifests/ -n dev2

# List all objects from default, dev1 & dev2 Namespaces
kubectl get all -n default
kubectl get all -n dev1
kubectl get all -n dev2

Step-04: Access Application

Default Namesapace

# List Services
kubectl get svc

# Access Application
http://<Public-IP-from-List-Services-Output>/app1/index.html

Dev1 Namespace

# List Services
kubectl get svc -n dev1

# Access Application
http://<Public-IP-from-List-Services-Output>/app1/index.html

Dev2 Namespace

# List Services
kubectl get svc -n dev2

# Access Application
http://<Public-IP-from-List-Services-Output>/app1/index.html

Step-05: Clean-Up

# Delete namespaces dev1 & dev2
kubectl delete ns dev1
kubectl delete ns dev2

# List all objects from dev1 & dev2 Namespaces
kubectl get all -n dev1
kubectl get all -n dev2

# List Namespaces
kubectl get ns

# Delete App from default Namespace (Dont Delete default Namespace - k8s default service exists in it)
kubectl delete -f kube-manifests/

# Get all from All Namespaces
kubectl get all -all-namespaces

References:

Best Selling Azure Kubernetes Service Course on Udemy

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Best Selling AWS EKS Kubernetes Course on Udemy

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HashiCorp Certified Terraform Associate - 50 Practical Demos

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