Deployment of Applications

This topic describes how to use the CLI to deploy a workspace catalog application to attached clusters within a workspace.

Prerequisites

Before you begin, you must have:

A running cluster with Kommander installed.
An existing Kubernetes cluster attached to Kommander.

Set the WORKSPACE_NAMESPACE environment variable to the name of the workspace’s namespace the attached cluster exists in:

export WORKSPACE_NAMESPACE=<workspace_namespace>

After creating a GitRepository, use either the DKP UI or the CLI to enable your catalog applications.

IMPORTANT: From within a workspace, you can enable applications to deploy. Verify that an application has successfully deployed via the CLI.

Enable the application using the DKP UI

Follow these steps to enable your catalog applications from the DKP UI:

From the top menu bar, select your target workspace.
Select Applications from the sidebar menu to browse the available applications from your configured repositories.
Select the three dot button from the bottom-right corner of the desired application tile, and then select Enable.
If available, select a version from the drop-down menu. This drop-down menu will only be visible if there is more than one version.
(Optional) If you want to override the default configuration values, copy your customized values into the text editor under Configure Service or upload your yaml file that contains the values:
```
someField: someValue
```
Confirm the details are correct, and then select the Enable button.

For all applications, you must provide a display name and an ID which is automatically generated based on what you enter for the display name, unless or until you edit the ID directly. The ID must be compliant with Kubernetes DNS subdomain name validation rules.

Alternately, you can use the CLI to enable your catalog applications.

Enable the application using the CLI

See workspace catalog applications for the list of available applications that you can deploy on the attached cluster.

Enable a supported application to deploy to your existing attached cluster with an AppDeployment resource.

Within the AppDeployment, define the appRef to specify which App to enable:

cat <<EOF | kubectl apply -f -
apiVersion: apps.kommander.d2iq.io/v1alpha2
kind: AppDeployment
metadata:
  name: spark-operator
  namespace: ${WORKSPACE_NAMESPACE}
spec:
  appRef:
    name: spark-operator-1.1.17
    kind: App
EOF

Create the resource in the workspace you just created, which instructs Kommander to deploy the AppDeployment to the KommanderClusters in the same workspace.

NOTE: The appRef.name must match the app name from the list of available catalog applications.

Enable an application with a custom configuration using the CLI

Provide the name of a ConfigMap in the AppDeployment, which provides custom configuration on top of the default configuration:

cat <<EOF | kubectl apply -f -
apiVersion: apps.kommander.d2iq.io/v1alpha2
kind: AppDeployment
metadata:
  name: spark-operator
  namespace: ${WORKSPACE_NAMESPACE}
spec:
  appRef:
    name: spark-operator-1.1.17
    kind: App
  configOverrides:
    name: spark-operator-overrides
EOF

Create the ConfigMap with the name provided in the step above, with the custom configuration:

cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: ConfigMap
metadata:
  namespace: ${WORKSPACE_NAMESPACE}
  name: spark-operator-overrides
data:
  values.yaml: |
    configInline:
      uiService:
        enable: false
EOF

Kommander waits for the ConfigMap to be present before deploying the AppDeployment to the attached clusters.

Verify applications

The applications are now enabled. Connect to the attached cluster and check the HelmReleases to verify the deployment:

kubectl get helmreleases -n ${WORKSPACE_NAMESPACE}