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.
2023/day32/Deployment.yml
Task 1: Create one Deployment file to deploy a sample react-django-app on K8s using the "Auto-healing" and "Auto-Scaling" feature
Step 1:- I have already a docker image in the docker hub for a sample todo-app. Now we need to pull the the image from docker hub by running the below command
docker pull devkrgoutam/react_django_app:latest
Step 3:- Now we have to create the deployment
apiVersion: v1
kind: Pod
metadata:
name: react-django-app
spec:
containers:
- name: react-django-app
image: devkrgoutam/react-django-app
ports:
- containerPort: 8000
Step 2:- Then create a Manifest file named pod.yml where all the configuration related to the image will store.
ent using the below command
kubectl apply -f pod.yml
Step 4:- Now we can verify whether the pods are running or not by following the below command.
kubectl get pods
Step 5:- Now after deleting a pod still get 2 pods as Auto Healing is working, so even though 1 pod is removed or deleted a new pod is replaced with the older one.
Step 6:- Now if we need to delete deployment we can use the below command
kubectl delete -f pod.yml
Note: if we want to scale up and scale down, Can do it using the below command
kubectl scale react-django-app --replicas=10