Enable a Custom Application from the Project Catalog

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

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

Enable the application using the DKP UI

From the top menu bar, select your target workspace.
Select Projects from the sidebar menu.
Select your project from the list.
Select the Applications tab 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 values content into the text editor under Configure Service or just 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 custom applications.

Enable the application using the CLI

Set the PROJECT_NAMESPACE environment variable to the name of the project’s namespace:
```
export PROJECT_NAMESPACE=<project_namespace>
```
Get the list of available applications to enable using the following command:
```
kubectl get apps -n ${PROJECT_NAMESPACE}
```
Enable one of the supported applications from the list with an AppDeployment resource.

Within the AppDeployment, define the appRef to specify which App will be enabled:

cat <<EOF | kubectl apply -f -
apiVersion: apps.kommander.d2iq.io/v1alpha2
kind: AppDeployment
metadata:
  name: my-custom-app
  namespace: ${PROJECT_NAMESPACE}
spec:
  appRef:
    name: custom-app-0.0.1
    kind: App
EOF

NOTE: The appRef.name must match the app name from the list of available 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: my-custom-app
  namespace: ${PROJECT_NAMESPACE}
spec:
  appRef:
    name: custom-app-0.0.1
    kind: App
  configOverrides:
    name: my-custom-app-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: ${PROJECT_NAMESPACE}
  name: my-custom-app-overrides
data:
  values.yaml: |
    someField: someValue
EOF

Kommander waits for the ConfigMap to be present before enabling the AppDeployment to the attached clusters in the Project.

Verify applications

After completing the previous steps, your applications are enabled. Connect to the attached cluster and check the HelmReleases to verify the deployments:

kubectl get helmreleases -n ${PROJECT_NAMESPACE}

NAMESPACE               NAME            READY   STATUS                             AGE
project-test-vjsfq      my-custom-app   True    Release reconciliation succeeded   7m3s

Upgrade custom applications

You must maintain your custom applications manually. When upgrading DKP, ensure you validate for compatibility issues any custom applications you run against the current version of Kubernetes. We recommend upgrading to the latest compatible application versions as soon as possible.