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Dry Run Option In Kubectl

In this article, we will discuss the dry run option in Kubectl.

Purpose

In Kubernetes, the --dry-run option is used with various Kubectl commands to simulate the result of applying a resource configuration without creating or modifying any resources in the cluster.

Prerequisites

Before reading this article, ensure the kind tool and Kubectl are installed on your machine.

Scenario

Consider a scenario, where we want to simulate the pod creation. For that, we will use the following command: -

kubectl run [pod_name] --image=nginx --dry-run=client -o yaml

The above command will create a YAML code to create a pod.

Picture showing the dry-run while creating the pod

Creating The YAML File

You need to create the YAML file generated by the dry-run command in the previous step. This is the code generated in the previous step: -

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: pod2
  name: pod2
spec:
  containers:
  - image: nginx
    name: pod2
    resources: {}
  dnsPolicy: ClusterFirst
  restartPolicy: Always
status: {}

You can save the file by any name.

Kubectl Apply Command

Once the YAML file is generated, execute the following command: -

kubectl apply -f [YAML_file]

Picture showing the output of kubectl apply command

The pod is generated.

Picture showing the pod generated in Kubernetes

Posted By -	Karan Gupta

Posted On -	Sunday, January 28, 2024

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