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HelmChart v1 (Deprecated)

important

The HelmChart custom resource apiVersion: kots.io/v1beta1 is deprecated. For installations with Replicated KOTS v1.99.0 and later, use the HelmChart custom resource with apiVersion: kots.io/v1beta2 instead. See HelmChart v2 and Confguring the HelmChart Custom Resource v2.

To deploy Helm charts, KOTS requires a unique HelmChart custom resource for each Helm chart .tgz archive in the release. You configure the HelmChart custom resource to provide the necessary instructions to KOTS for processing and preparing the chart for deployment. Additionally, the HelmChart custom resource creates a mapping between KOTS and your Helm chart to allow Helm values to be dynamically set during installation or upgrade.

For more information, see About Distributing Helm Charts with KOTS.

Example​

The following is an example manifest file for the HelmChart v1 custom resource:

apiVersion: kots.io/v1beta1
kind: HelmChart
metadata:
  name: samplechart
spec:
  # chart identifies a matching chart from a .tgz
  chart:
    name: samplechart
    chartVersion: 3.1.7
    releaseName: samplechart-release-1

  exclude: "repl{{ ConfigOptionEquals `include_chart` `include_chart_no`}}"

  # helmVersion identifies the Helm Version used to render the chart. Default is v3.
  helmVersion: v3

  # useHelmInstall identifies the kots.io/v1beta1 installation method
  useHelmInstall: true

  # weight determines the order that charts with "useHelmInstall: true" are applied, with lower weights first.
  weight: 42

  # helmUpgradeFlags specifies additional flags to pass to the `helm upgrade` command.
  helmUpgradeFlags:
    - --skip-crds
    - --no-hooks
    - --timeout
    - 1200s
    - --history-max=15

  # values are used in the customer environment, as a pre-render step
  # these values will be supplied to helm template
  values:
    postgresql:
      enabled: repl{{ ConfigOptionEquals `postgres_type` `embedded_postgres`}}

  optionalValues:
    - when: "repl{{ ConfigOptionEquals `postgres_type` `external_postgres`}}"
      recursiveMerge: false
      values:
        postgresql:
          postgresqlDatabase: "repl{{ if ConfigOptionEquals `postgres_type` `external_postgres`}}repl{{ ConfigOption `external_postgres_database`}}repl{{ end}}"
          postgresqlUsername: "repl{{ if ConfigOptionEquals `postgres_type` `external_postgres`}}repl{{ ConfigOption `external_postgres_username`}}repl{{ end}}"
          postgresqlHost: "repl{{ if ConfigOptionEquals `postgres_type` `external_postgres`}}repl{{ ConfigOption `external_postgres_host`}}repl{{ end}}"
          postgresqlPassword: "repl{{ if ConfigOptionEquals `postgres_type` `external_postgres`}}repl{{ ConfigOption `external_postgres_password`}}repl{{ end}}"
          postgresqlPort: "repl{{ if ConfigOptionEquals `postgres_type` `external_postgres`}}repl{{ ConfigOption `external_postgres_port`}}repl{{ end}}"

  # namespace allows for a chart to be installed in an alternate namespace to
  # the default
  namespace: samplechart-namespace

  # builder values provide a way to render the chart with all images
  # and manifests. this is used in Replicated to create `.airgap` packages
  builder:
    postgresql:
      enabled: true

chart​

The chart key allows for a mapping between the data in this definition and the chart archive itself. More than one kind: HelmChart can reference a single chart archive, if different settings are needed.

chart.name​

The name of the chart. This value must exactly match the name field from a Chart.yaml in a .tgz chart archive that is also included in the release. If the names do not match, then the installation can error or fail.

chart.chartVersion​

The version of the chart. This value must match the version field from a Chart.yaml in a .tgz chart archive that is also included in the release.

chart.releaseName​

Introduced in Replicated KOTS v1.73.0

Specifies the release name to use when installing this instance of the Helm chart. Defaults to the chart name.

The release name must be unique across all charts deployed in the namespace. To deploy multiple instances of the same Helm chart in a release, you must add an additional HelmChart custom resource with a unique release name for each instance of the Helm chart.

Must be a valid Helm release name that matches regex ^[a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*$ and is no longer than 53 characters.

helmVersion​

Identifies the Helm Version used to render the chart. Acceptable values are v2 or v3. v3 is the default when no value is specified.

note

Support for Helm v2, including security patches, ended on November 13, 2020. If you specified helmVersion: v2 in any HelmChart custom resources, update your references to v3. By default, KOTS uses Helm v3 to process all Helm charts.

useHelmInstall​

Identifies the method that KOTS uses to install the Helm chart:

  • useHelmInstall: true: KOTS uses Kustomize to modify the chart then repackages the resulting manifests to install. This was previously referred to as the native Helm installation method.

  • useHelmInstall: false: KOTS renders the Helm templates and deploys them as standard Kubernetes manifests using kubectl apply. This was previously referred to as the Replicated Helm installation method.

    note

    You cannot migrate existing Helm charts in existing installations from the useHelmInstall: false installation method to a different method. If KOTS already installed the Helm chart previously in the environment using a HelmChart custom resource with apiVersion: kots.io/v1beta1 and useHelmInstall: false, then KOTS does not attempt to install the chart using a different method and displays the following error message: Deployment method for chart <chart_name> has changed.

    To change the installation method from useHelmInstall: false to a different method, the user must reinstall your application in a new environment.

For more information about how KOTS deploys Helm charts when useHelmInstall is true or false, see About Distributing Helm Charts with KOTS.

weight​

The weight field is not supported for HelmChart custom resources with useHelmInstall: false.

Determines the order in which KOTS applies the Helm chart. Charts are applied by weight in ascending order, with lower weights applied first. Supported values: Positive or negative integers. Default: 0

In KOTS v1.99.0 and later, weight also determines the order in which charts are uninstalled. Charts are uninstalled by weight in descending order, with higher weights uninstalled first. For more information about uninstalling applications, see remove in KOTS CLI.

For more information, see Orchestrating Resource Deployment.

helmUpgradeFlags​

The helmUpgradeFlags field is not supported for HelmChart custom resources with useHelmInstall: false.

Specifies additional flags to pass to the helm upgrade command for charts. These flags are passed in addition to any flags Replicated KOTS passes by default. The values specified here take precedence if KOTS already passes the same flag. The helmUpgradeFlags attribute can be parsed by template functions. For more information about template functions, see About template function contexts.

KOTS uses helm upgrade for all deployments of an application, not just upgrades, by specifying the --install flag. For non-boolean flags that require an additional argument, such as --timeout 1200s, you must use an equal sign (=) or specify the additional argument separately in the array.

Example:

helmUpgradeFlags:
  - --timeout
  - 1200s
  - --history-max=15

values​

The values key can be used to set or delete existing values in the Helm chart values.yaml file. Any values that you include in the values key must match values in the Helm chart values.yaml. For example, spec.values.images.pullSecret in the HelmChart custom resource matches images.pullSecret in the Helm chart values.yaml.

During installation or upgrade with KOTS, values is merged with the Helm chart values.yaml in the chart archive. Only include values in the values key that you want to set or delete.

exclude​

The attribute is a value for making optional charts. The exclude attribute can be parsed by template functions.

When Replicated KOTS processes Helm charts, it excludes the entire chart if the output of the exclude field can be parsed as a boolean evaluating to true.

For more information about optional charts, template functions, and how KOTS processes Helm charts, see:

optionalValues​

The optionalValues key can be used to set values in the Helm chart values.yaml file when a given conditional statement evaluates to true. For example, if a customer chooses to include an optional application component in their deployment, it might be necessary to include Helm chart values related to the optional component.

optionalValues includes the following properties:

  • optionalValues.when: Defines a conditional statement using KOTS template functions. If optionalValues.when evaluates to true, then the values specified in optionalValues are set.

  • optionalValues.recursiveMerge: Defines how optionalValues is merged with values.

  • optionalValues.values: An array of key-value pairs.

optionalValues.when​

The optionalValues.when field defines a conditional statement that must evaluate to true for the given values to be set. Evaluation of the conditional in the optionalValues.when field is deferred until render time in the customer environment.

Use KOTS template functions to write the optionalValues.when conditional statement. The following example shows a conditional statement for selecting a database option on the Admin Console configuration screen:

optionalValues:
  - when: repl{{ ConfigOptionEquals "postgres_type" "external_postgres"}}

For more information about using KOTS template functions, see About Template Functions.

optionalValues.recursiveMerge​

note

recursiveMerge is available in KOTS v1.38.0 and later.

The optionalValues.recursiveMerge boolean defines how KOTS merges values and optionalValues:

  • When optionalValues.recursiveMerge is false, the top level keys in optionalValues override the top level keys in values. By default, optionalValues.recursiveMerge is set to false.

  • When optionalValues.recursiveMerge is true, all keys from values and optionalValues are included. In the case of a conflict where there is a matching key in optionalValues and values, KOTS uses the value of the key from optionalValues.

Default: False

namespace​

The namespace key specifies an alternative namespace where Replicated KOTS installs the Helm chart. Default: The Helm chart is installed in the same namespace as the Admin Console. The namespace attribute can be parsed by template functions. For more information about template functions, see About template function contexts.

If you specify a namespace in the HelmChart namespace field, you must also include the same namespace in the additionalNamespaces field of the Application custom resource manifest file. KOTS creates the namespaces listed in the additionalNamespaces field during installation. For more information, see additionalNamespaces in the Application reference.

builder​

In the builder key, you provide the minimum Helm values required to render the chart templates so that the output includes any images that must be included in the air gap bundle. The Vendor Portal uses these values to render the Helm chart templates when building the .airgap bundle for the release.

The builder key has the following requirements and recommendations:

  • Replicated recommends that you include only the minimum Helm values in the builder key that are required to template the Helm chart with the correct image tags.
  • Use only static, or hardcoded, values in the builder key. You cannot use template functions in the builder key because values in the builder key are not rendered in a customer environment.
  • Any required Helm values that need to be set to render the chart templates must have a value supplied in the builder key. For more information about the Helm required function, see Using the 'required' function in the Helm documentation.

Example:

For example, a Helm chart might include a conditional PostgreSQL Deployment, as shown in the Helm template below:

{{- if .Values.postgresql.enabled }}
apiVersion: apps/v1
kind: Deployment
metadata:
  name: postgresql
  labels:
    app: postgresql
spec:
  selector:
    matchLabels:
      app: postgresql
  template:
    metadata:
      labels:
        app: postgresql
    spec:
      containers:
      - name: postgresql
        image: "postgres:10.17"
        ports:
        - name: postgresql
          containerPort: 80
# ...
{{- end }}

To ensure that the postgresql image is included in the air gap bundle for the release, the postgresql.enabled value is added to the builder key of the HelmChart custom resource and is hardcoded to true:

apiVersion: kots.io/v1beta2
kind: HelmChart
metadata:
  name: samplechart
spec:
  chart:
    name: samplechart
    chartVersion: 3.1.7
  values:
    postgresql:
      enabled: repl{{ ConfigOptionEquals "postgres_type" "embedded_postgres"}}
  builder:
    postgresql:
      enabled: true