Kubernetes deployment

Nandhabalan Marimuthu
1 min readMay 18, 2021

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.

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