Kubernetes deployment

what is a deployment?

A Kubernetes Deployment is used to tell Kubernetes how to create or modify instances of the pods that hold a containerized application. Deployments can scale the number of replica pods, enable the rollout of updated code in a controlled manner, or roll back to an earlier deployment version if necessary.

How to create a deployment?

you can create a deployment either using a command or using a yaml file.

using a command:

kubectl create deployment my-webdep --image=nginx --replicas=1 --port=80

using yml file:

For that create a folder and inside that create a yml file as deployment.yml and paste the following command in that

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 1 # tells deployment to run 2 pods matching the template
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80

And run the following command in the terminal

kubectl apply -d deployment.yml

After deploying you have to expose that as a service we can see that in the next story →link

you can check your deployment status using

kubectl get deployments

That’s it for today. I hope you understand everything and thank you for reading.