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Adding Helm Charts to a Release

This topic describes how to add a Helm chart to a release in the Replicated vendor portal. Adding a Helm chart to a release is useful if you want to distribute a Kubernetes application with Replicated that is already packaged using Helm.

This procedure applies for Replicated Helm installations and native Helm installations. For more information, see Helm Overview.

About Releasing with Helm Charts

You can add one or more Helm charts to a release in the vendor portal by uploading each Helm chart as a .tgz package. This allows you to use Replicated to distribute applications that are packaged with Helm.

When you add a Helm chart to a release, Replicated adds a copy of the Chart.yaml file and the values.yaml file from the Helm chart to the release.

You must also have a HelmChart custom resource manifest file in the release for each Helm chart that you add. You use this HelmChart custom resource to configure the Helm chart with your application.

The following table provides more information about these files:

FileDescription
HelmChart custom resourceA HelmChart custom resource is a YAML file with kind: HelmChart.

When you drag and drop a Helm chart .tgz to a release in the vendor portal, Replicated automatically creates a corresponding HelmChart custom resource manifest that uses the naming convention CHART_NAME.yaml. For example, postgresql.yaml.

The HelmChart custom resource references the .tgz export of the Helm chart and provides the necessary instructions to the Replicated app manager for processing and preparing the chart for deployment.

For more information, see HelmChart in the Custom Resources section.
Chart.yamlReplicated extracts the Chart.yaml file from the Helm chart .tgz file that you provide. This file is read-only and cannot be edited in the release.
values.yamlReplicated extracts the values.yaml file from the Helm chart .tgz file that you provide. This file is read-only and cannot be edited in the release.

For example, the following screenshot shows how a Postgres Helm chart displays in the file tree of a release in the vendor portal:

Postgres Helm Chart

Add a Helm Chart to a Release

To include a Helm chart in a release, first package the Helm chart, including any of its dependencies, as a .tgz file. Then, add the .tgz Helm chart package to your release.

There are different steps for creating the Helm chart package depending on if the Helm chart source is in a remote chart repository such as Artifact Hub, or in a local directory.

For more information about the Helm CLI commands in this procedure, see the Helm Commands section in the Helm documentation.

To package a Helm chart and add it to a release:

  1. If the Helm chart source is in a chart repository, do the following:

    1. Update your local directory with the latest available Helm chart information from your chart repositories. Run:

      helm repo update
      note

      You can also pass the names of a specific repository or repositories that you want to update in the helm repo update command. For more information, see Helm Repo Update in the Helm documentation.

    2. Download the latest copy of the desired Helm chart from a repository. Run:

      helm fetch REPO_NAME/CHART_NAME

      Replace:

      • REPO_NAME with the name of the repository where the Helm chart is located.
      • CHART_NAME with the name of the Helm chart as it appears in the repository.

      The Helm chart, including any dependencies, is packaged and copied to your current directory in a .tgz file. The file uses the naming convention: CHART_NAME-VERSION.tgz. For example, postgresql-8.1.2.tgz.

  2. If the Helm chart source is in your local directory, do the following:

    1. In your local directory, cd to the location of the Chart.yaml file for the Helm chart.

    2. If the Chart.yaml file includes any dependencies, update the charts/ directory. Run:

      helm dependency update

    3. Package the Helm chart. Run:

      helm package .

      The Helm chart, including any dependencies, is packaged and copied to your current directory in a .tgz file. The file uses the naming convention: CHART_NAME-VERSION.tgz. For example, postgresql-8.1.2.tgz.

  3. Do one of the following to add the Helm chart .tgz package to a release:

    • From the vendor portal:

      1. In the vendor portal, click Releases. Then, either click Create release to create a new release, or click Edit YAML to edit an existing release.

      2. Drag and drop the Helm chart .tgz package from your local directory to the file tree in the release in the vendor portal.

        Replicated automatically creates the HelmChart custom resource manifest file for the Helm chart.

    • From the replicated CLI:

      1. Copy the Helm chart .tgz package to the local directory that contains the manifest files for the release.

      2. Create a HelmChart custom resource manifest file in the same directory where you copied the .tgz file. Name the HelmChart manifest file CHART_NAME.yaml. For example, postgresql.yaml.

      3. Copy and paste the following YAML into the HelmChart manifest:

        apiVersion: kots.io/v1beta1
        kind: HelmChart
        metadata:
          # name matches the file name that you used.
          # If you saved the file as CHART_NAME.yaml, use name: CHART_NAME
          name: CHART_NAME
        spec:
        # chart identifies the Helm chart from the .tgz
        # Replace CHART_NAME with the name of the chart from the .tgz
        # Replace CHART_VERSION with the version of the chart from the .tgz
          chart:
            name: CHART_NAME
            chartVersion: CHART_VERSION

          # helmVersion identifies the version of Helm used to render the chart.
          # Possible values are v2 or v3.
          helmVersion: v3

          # useHelmInstall identifies whether this Helm chart uses the
          # Replicated Helm installation (false) or native Helm installation (true).
          # Native Helm installation is available for Helm v3 charts only.
          useHelmInstall: true

          # values maps user-provided values with the Helm chart values.yaml file.
          # You can leave the values attribute empty for this procedure.
          values: {}

          # builder values are used to create air gap packages.
          # You can leave the builder attribute empty for this procedure.
          builder: {}

        For more information, see HelmChart in the Custom Resources section.

      4. Create a new release or update an existing release:

        • Create a new release:

          replicated release create --yaml-dir PATH-TO-APP-DIRECTORY

          Replace PATH-TO-APP-DIRECTORY with the path to the local directory where you copied the Helm chart .tgz and created the HelmChart custom resource manifest file..

        • Update an existing release:

          replicated release update SEQUENCE --yaml-dir PATH-TO-APP-DIRECTORY

          Replace:

          • SEQUENCE with the release sequence number. This identifies the existing release to be updated.
          • PATH-TO-APP-DIRECTORY with the path to the local directory where you copied the Helm chart .tgz and created the HelmChart custom resource manifest file.

      For more information, see release create and release update in the replicated CLI documentation.

  4. Save and promote the release to a development environment to test your changes.

Next Steps

After you add one or more Helm charts to a release, Replicated recommends that you update the HelmChart custom resource manifest to continue configuring your application.

The following are recommended next steps for configuring the HelmChart custom resource: