How to Use Kubectl Dry Run Command

If you're managing Kubernetes clusters, you know how important it is to make changes to the resources in a controlled and safe way. One way to do this is by using the kubectl dry run command, which allows you to see the changes that would be made without actually applying them. In this article, we'll go over what the kubectl dry run command is, how to use it, and some examples of when it can be useful.

What is Kubectl Dry Run Command?

The kubectl dry run command allows you to simulate the changes that would be made to a resource by a kubectl apply command, without actually applying them. This is useful because it allows you to preview the changes and make sure they are what you intended before actually applying them.

How to Use Kubectl Dry Run Command

Using the kubectl dry run command is easy. Here's how:

1. Open up a terminal window and make sure you have the kubectl command line tool installed and configured to connect to your Kubernetes cluster.

2. Run the following command to perform a dry run of a resource:

kubectl apply --dry-run=client -f resource.yaml

In this command, replace resource.yaml with the name of the YAML file that defines the resource you want to apply. The --dry-run=client flag tells kubectl to perform a dry run on the client side rather than on the server side.

3. After running the command, you'll see the changes that would be made if you were to actually apply the resource. This allows you to review the changes and make sure they are what you intended before actually applying them.

4. If you're satisfied with the changes, you can apply the resource by running the same command without the --dry-run=client flag:

kubectl apply -f resource.yaml

Examples of When to Use Kubectl Dry Run Command

Here are some examples of when the kubectl dry run command can be useful:

• When making changes to critical resources, such as pods or services, that could cause downtime if applied incorrectly.
• When testing changes to resources in a non-production environment.
• When creating new resources, to make sure they are defined correctly before actually applying them.

The kubectl dry run command is a powerful tool for managing Kubernetes clusters. By allowing you to preview the changes that would be made before actually applying them, it helps you make changes in a controlled and safe way. Use it whenever you need to make changes to critical resources or test changes in a non-production environment.

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That's it for this post. Keep practicing and have fun. Leave your comments if any.