Helm Charts

Helm Charts are packages of pre-configured Kubernetes resources that help you define, install, and upgrade Kubernetes applications. You can integrate Helm Charts with DuploCloud to deploy applications onto the Kubernetes clusters you've created in DuploCloud. For Helm Charts general guidance and best practices, see the Helm Charts Info page in the DuploCloud Extras section.

Prerequisites

• Ensure you have a Kubernetes cluster set up in DuploCloud.

• Install Helm on your local machine or a machine with access to your Kubernetes cluster.

Creating Helm Charts

Identify the Helm charts you want to use for deploying your applications or services.

You can use community-maintained charts from public repositories like Artifact Hub, or you can create your own custom charts tailored to your specific needs.

To create custom Helm charts, modify the values.yaml or create custom templates as necessary. This might involve configuring resource limits, environment variables, or other settings specific to your deployment.

You can also modify Helm Chart values using the node selector. This is the most common method. For example, to deploy a chart into the duploservices-mytenant Tenant using the node selector, give:

nodeSelector:
  tenantname: duploservices-mytenant

To specify which hosts the chart should run on using the node selector with allocation tags, give:

nodeSelector:
  tenantname: duploservices-mytenant
  allocationtags: mychart

Adding Helm Repositories in DuploCloud

Add Helm chart repositories so you can deploy applications to your Kubernetes clusters. When adding a repository, you’ll select the repository type. You can choose standard Helm repositories, which use a catalog (index.yaml) to list charts, or OCI repositories, which allow certain OCI-compliant registries to be treated like Helm repositories. Once the repository is added, its charts become available for deploying Helm releases in your clusters.

To add a Helm repository in the DuploCloud Portal:

1. Navigate to Kubernetes -> Helm.

2. Select the Repository tab, and click Add. The Add Helm Repository pane displays.

1. Complete the following fields:

1. Click Create. The Helm repository is added.

Managing Helm Repositories

Once you've added a Helm repository, you can view its details, update its configuration, or delete from directly in the DuploCloud Portal.

1. Navigate to Kubernetes → Helm.

2. Select the Helm Repository tab.

3. Click the menu icon () in the row of the repository you want to manage.

4. Choose one of the following actions:

Deploying a Helm Release

Deploy a Kubernetes cluster using a Helm Chart from the DuploCloud Platform.

1. From the DuploCloud Portal, navigate to Kubernetes → Helm.

2. Select the Release tab, and click Add. The Add Helm Release page displays

1. Complete the following fields.

1. Click Add to deploy the Helm release. To check the status of your release, navigate to Kubernetes → Helm and select the Release tab.

Viewing Helm Deployments

Navigate to the Services page (Kubernetes → Services) to view a list of all deployed services, including those created using Helm Charts. Use this view to confirm that the service has deployed without errors and all components are running as expected.

• Helm-deployed services are displayed in read-only mode. This means:

  • You can view details (e.g., replicas, resource allocation, logs) to confirm that the service is functioning as expected.

  • However, you cannot modify the service directly in DuploCloud. Any changes to the service must be made by updating the Helm chart and redeploying it.

Click on the name of the Service in the NAME column to view details.