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Create Deployment Command In Kubernetes

In this article, we will discuss the deployment in Kubernetes.

Purpose

A deployment refers to a Kubernetes resource object used to manage the deployment of applications or services within a Kubernetes cluster.

Syntax

kubectl create deploy [deployment_name] --image=[image_name]

Prerequisite

The first step is to install Kind and the kubectl utility using the following command: -

snap install kubectl --classic

Example

Picture showing the execution of kubectl create deploy command

Dry Run

You can also use a dry-run to generate the YAML file.

kubectl create deploy [deployment_name] --image=[image_name] --dry-run=client -o yaml

Picture showing the execution of dry run of kubectl create deploy command

Retrieve Deployment Information

To retrieve the information, we will use the following command: -

kubectl get deployment [deployment_name]

Picture showing the information about the deployment using the kubectl get deployment command

To get the deployment information in the YAML format, we will use the following command: -

kubectl get deployment [deployment_name] -o yaml

Picture showing the yaml of the deployment

Scaling The Deployment

In the previous image, the number of replicas for the deployment is one. But you can scale your deployment to update the number of replicas. You can use the following command: -

kubectl scale deploy [deployment_name] --replicas=[desired_replicas]

Picture showing the output of kubectl scale deploy command in docker

Once the above command is executed, the number of replicas is scaled up from 1 to 4.

Picture showing the replica is changed from 1 to 4

Update The Container Image In Deployment

You can use the following command to update the container: -

kubectl set image deploy [deployment_name] [container_image_name]=[updated_image]

Picture showing the output of kubectl set image deploy command for changing the image in docker

The container image is updated with the new image.

Picture showing the image of the container is updated in docker

What Does Replica Mean?

A replica is the number of identical copies (or instances) of a pod that should be running at any given time.

What Is A Selector?

In Kubernetes, selectors are key-value pairs that are used to identify which pods should be controlled by a particular controller, such as a Deployment, ReplicaSet, or StatefulSet.

Posted By -	Karan Gupta

Posted On -	Monday, January 29, 2024

Updated On -	Sunday, February 4, 2024

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