Launching your Kubernetes Cluster with Deployment

What is Deployment in k8s

A Deployment provides a configuration for updates for Pods and ReplicaSets.

You describe a desired state in a Deployment, and the Deployment Controller changes the actual state to the desired state at a controlled rate. You can define Deployments to create new replicas for scaling, or to remove existing Deployments and adopt all their resources with new Deployments.

Today's task let's keep it very simple.

Task-1:

Create one Deployment file to deploy a sample todo-app on K8s using "Auto-healing" and "Auto-Scaling" feature

add a deployment.yml file (sample is kept in the folder for your reference)
apply the deployment to your k8s (minikube) cluster by command kubectl apply -f deployment.yml

Creating namespace.

- kubectl create namespace django-ns

View namespace.

- kubectl get namespace

Create deployment.yaml and view.

- vim deployment.yaml

- cat deployment.yaml

Applying the configuration od deployment.yaml file.

- kubectl apply -f deployment.yaml

View pods created with deployment file

- kubectl get pods -n django-ns

Deleting a pod

- kubectl delete pod django-deployment-6fcf5458b5-4tzqx -n django-ns

View pods

- kubectl get pods -n django-ns : (One pod is terminating and another pod is creating automatically to get the desired state (3 pods) mentioned in the deployment, and this feature is called "Auto Healing")