Essential Helm Commands for Kubernetes Applications
Helm, the package manager for Kubernetes, simplifies application deployment and management. By using Helm charts, you can automate deployments, manage configuration, and streamline upgrades. Here are some of the most important Helm commands with simple explanations to help you manage Kubernetes applications efficiently.
1. helm repo add
Command:
helm repo add stable https://charts.helm.sh/stable
Adds a Helm repository to your system. This is where Helm looks for charts when installing applications.
2. helm repo update
Command:
helm repo update
Refreshes your local list of charts from the repositories you’ve added. Use this to ensure you’re working with the latest versions of the charts.
3. helm search repo
Command:
helm search repo nginx
Searches for charts in the added Helm repositories. Replace nginx
with the application name you’re looking for.
4. helm install
Command:
helm install my-app stable/nginx
Installs a Helm chart in your Kubernetes cluster. The first argument (my-app
) is the release name, and the second (stable/nginx
) is the chart you want to deploy.
5. helm upgrade
Command:
helm upgrade my-app stable/nginx --set replicaCount=3
Upgrades an existing Helm release (my-app
) with a new chart or updated configuration. You can pass configuration changes using --set
.
6. helm rollback
Command:
helm rollback my-app 1
Reverts a Helm release (my-app
) to a previous revision (e.g., revision 1
). Use this if something goes wrong after an upgrade.
7. helm uninstall
Command:
helm uninstall my-app
Uninstalls a Helm release (my-app
) from your Kubernetes cluster. The associated resources created by the chart will be removed.
8. helm list
Command:
helm list
Lists all Helm releases in your Kubernetes cluster. You can see details like the release name, status, and namespace.
9. helm status
Command:
helm status my-app
Displays the current status of a Helm release (my-app
), including its resources and notes provided by the chart.
10. helm template
Command:
helm template my-app stable/nginx
Renders a Helm chart into Kubernetes manifests locally, without applying them to the cluster. This is helpful for reviewing or debugging the generated YAML files.
11. helm lint
Command:
helm lint ./my-chart
Validates a Helm chart for syntax or configuration errors. This ensures the chart is ready for deployment.
12. helm package
Command:
helm package ./my-chart
Packages a Helm chart into a .tgz
archive. This is useful for sharing or uploading charts to a repository.
13. helm push
Command:
helm push my-chart.tgz my-repo
Pushes a packaged chart to a Helm repository. Replace my-repo
with the name of your target repository.
14. helm repo remove
Command:
helm repo remove stable
Removes a Helm repository from your system. This is useful for cleaning up unused repositories.
15. helm show values
Command:
helm show values stable/nginx
Displays the default values of a Helm chart. These values can be overridden during installation or upgrades.
16. helm get manifest
Command:
helm get manifest my-app
Fetches the rendered Kubernetes manifest for a Helm release (my-app
). Use this to debug deployment issues.
17. helm diff upgrade
Command:
helm diff upgrade my-app stable/nginx
Shows the differences between the currently deployed version of a Helm release and an updated chart. Useful for reviewing changes before applying them.
18. helm history
Command:
helm history my-app
Displays the revision history of a Helm release. Each revision corresponds to an install or upgrade operation.
19. helm test
Command:
helm test my-app
Runs the tests associated with a Helm release. This ensures that your deployment works as expected.
20. helm dependencies update
Command:
helm dependencies update ./my-chart
Updates the dependencies of a chart. Use this when your chart relies on other charts that have changed.
Helm simplifies the deployment and management of Kubernetes applications, enabling developers to focus more on building features rather than dealing with complex configurations. By mastering these essential commands, you can create and maintain scalable Kubernetes environments with ease.
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