20 Helm Chart Interview Questions and Answers
Prepare for the types of questions you are likely to be asked when interviewing for a position where Helm Chart will be used.
A Helm chart is a collection of files that describe a Kubernetes application. charts can be used to deploy applications, databases, and other services to a Kubernetes cluster. Helm charts are often used to deploy production-ready applications to Kubernetes clusters.
If you are interviewing for a position that involves Helm charts, you should be prepared to answer questions about them. In this article, we will review some common Helm chart interview questions and how you can answer them.
Helm Chart Interview Questions and Answers
Here are 20 commonly asked Helm Chart interview questions and answers to prepare you for your interview:
1. What is Helm?
Helm is a package manager for Kubernetes that allows you to install, upgrade, and manage Kubernetes applications.
2. Can you explain what a helm chart is?
A helm chart is a collection of files that describe a Kubernetes application. It includes all of the resources needed to run the application, such as deployments, services, and ingress rules. Helm charts can be stored in a chart repository, which makes it easy to share them with others.
3. How do you use the helm init command?
The helm init command is used to install the Helm client and server on your Kubernetes cluster. This is the first step in using Helm, and is required in order to use any of the other Helm commands.
4. What are some of the most common commands used with Helm charts?
The most common commands used with Helm charts are install, upgrade, and delete. These commands are used to install, upgrade, and delete Helm charts, respectively.
5. What is Tiller? Is it necessary to install Tiller in order to run helm charts?
Tiller is a server that runs inside of a Kubernetes cluster and manages the installation and upgrade of helm charts. While it is not strictly necessary to install Tiller in order to run helm charts, it is generally considered to be best practice. This is because Tiller can help to manage the installation and upgrade process in a more automated and controlled manner.
6. What’s the best way to create a new release for an existing chart?
The best way to create a new release for an existing chart is to use the helm upgrade command. This will allow you to specify the new version number for the chart, as well as any other changes that need to be made.
7. What’s the best way to delete a chart from Kubernetes?
The best way to delete a Helm chart from Kubernetes is to use the “helm delete” command. This will delete the chart and all of its associated resources from your Kubernetes cluster.
8. What options can be specified when using the helm upgrade command?
The options that can be specified when using the helm upgrade command are:
–dry-run
–force
–install
–recreate-pods
–reset-values
–reuse-values
–set
–timeout
–wait
9. What does the “–wait” option do with the helm template and helm install commands?
The “–wait” option tells Helm to wait until all of the Pods, Services, and other resources in the Chart have been created before moving on. This is useful when you want to be sure that everything in the Chart is up and running before proceeding.
10. How do you enable debugging mode with the helm template and helm install commands?
The –debug or -d flag enables debugging mode for the helm template and helm install commands. This will print out additional information that can be helpful in troubleshooting errors.
11. Why wouldn’t I want to use the –force option with helm install or helm upgrade?
The –force option tells helm to ignore any previously installed versions of the chart and install the new version regardless. This can be dangerous because it can cause data loss if the new chart is not compatible with the old data.
12. What is helm rollback?
Helm rollback is the process of undoing a helm upgrade. This is useful if you need to revert back to a previous version of your helm chart for any reason.
13. What happens if there are multiple releases with the same name present in the cluster?
If there are multiple releases with the same name present in the cluster, then the helm chart will be unable to resolve the dependencies between them and will fail to install.
14. When would I need to use the helm dependency update command?
The helm dependency update command is used when you want to update the dependencies for a given Helm chart. This is useful if you want to ensure that you are using the latest versions of dependencies, or if you want to update to a specific version of a dependency.
15. What is the purpose of the requirements.yaml file in context of helm charts?
The requirements.yaml file is used to specify the dependencies for a given helm chart. This is important because it ensures that all of the necessary charts are installed in order for the given chart to function properly.
16. What’s the difference between a namespace and a repository?
A namespace is a collection of related charts, while a repository is a collection of charts from multiple namespaces.
17. What is the best way to find out how many releases are currently installed on the cluster?
The best way to find out how many releases are currently installed on the cluster is to use the helm list command. This will give you a list of all the releases that are currently installed on the cluster.
18. What is Kubeapps? How do you install it?
Kubeapps is an open-source project that provides a web-based user interface for deploying and managing applications on top of Kubernetes clusters. It is designed to make it easy to get started with Kubernetes and to help you automate the process of deploying and managing applications on your cluster. You can install Kubeapps by following the instructions on the project’s GitHub page.
19. What other ways exist to deploy applications to a kubernetes cluster?
There are a few other ways to deploy applications to a kubernetes cluster, but the most common method is using a helm chart. Other methods include using kubectl to deploy applications directly, or using a tool like Ansible.
20. What is the best way to execute custom code during the installation of a helm chart?
There are a few ways to execute custom code during the installation of a helm chart. One way would be to use a pre-install hook. This would allow you to run your custom code before any of the chart’s resources are installed. Another way would be to use a post-install hook. This would allow you to run your custom code after all of the chart’s resources have been installed.
