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    Create and verify a template

    This quickstart helps you create and deploy a three-tier web application template that includes frontend, backend, and database components. The following image shows the design canvas, which includes the application components and connections.

    A three-tier web application in the design canvas. The application includes frontend, backend, and database components.

    You design the template by doing one of the following:

    • Add and connect components on the design canvas in Application Design Center.
    • Use natural language prompts in Gemini Cloud Assist.

    After you complete the design, verify the template by deploying a test application in App Design Center.

    To follow step-by-step guidance for this task directly in the Google Cloud console, click Guide me :

    Guide me

    Before you begin

    1. Set up App Design Center .

    2. Create a descendant project in your app-enabled folder.

      You'll deploy Google Cloud resources to this project when you deploy your application.

    3. Make sure that billing is enabled for your descendant project.

    4. To use Gemini Cloud Assist to create your design, see Set up Gemini Cloud Assist .

    Make sure you have required roles

    1. To create templates, make sure you have one of the following roles on the management project:

    2. To deploy applications, make sure you have one of the following roles on the management project:

    3. To create a service account during deployment, grant the following role on the descendant project:

    Create a new template and add details

    Use the App Design Center design canvas or Gemini Cloud Assist to design your template.

    Design canvas

    1. In the Google Cloud console, go to the Templatespage.

      Go to Templates

    2. Click Create Templateand enter the following details:

      1. In the Template IDfield, enter quickstart-three-tier-web-app .

      2. In the Template Namefield, enter Quickstart three-tier web app .

      3. In the Descriptionfield, enter A template to generate a three-tier web application .

      4. Click Create template.

      The template is created and the design canvas is displayed.

    3. In the Componentsarea, click the following components to add them to the design canvas:

      • Cloud Run(add two components)
      • Cloud SQL (PostgreSQL)

    4. To create connections between components, do the following:

      1. From the blue dot at the bottom of cloud-run-1, drag to the blue dot at the top of cloud-run-2.

      2. From the blue dot at the bottom of cloud-run-2, drag to the blue dot at the top of sql-postgresql-1.

      Your template contains three components. The canvas displays between components to represent connections.

    Gemini Cloud Assist

    1. In the Google Cloud console toolbar, click spark Open or close Gemini Cloud Assist chat.

      The Cloud Assistpanel opens.

    2. In Gemini Cloud Assist chat, enter the following prompt:

       I want to create a three-tier web application.

      Gemini Cloud Assist generates a basic design for a three-tier web application.

    3. To remove the load balancers and Secret Manager components, enter the following prompt:

       I don't need load balancers or Secret Manager.

      Gemini Cloud Assist updates the design to remove the components.

    4. Review the updated design that includes the following components:

      • Cloud Run (two components)
      • Cloud SQL for PostgreSQL

    5. Click Edit app design.

      The Create a new templatepage is displayed.

    6. Enter the following template details:

      1. In the Template IDfield, enter quickstart-three-tier-web-app .

      2. In the Template Namefield, enter Quickstart three-tier web app .

      3. In the Descriptionfield, enter A template to generate a three-tier web application .

    7. Click Create template.

      The system creates a new template and displays the design canvas.

    Create an application draft

    1. From the design canvas, click Configure an app .

    2. Click Create new application and do the following:

      1. In the Namefield, enter quickstart-three-tier-test .

      2. In the Display Namefield, enter Quickstart three-tier test .

      3. From the Regionlist, select us-central1 (Iowa) .

      4. From the Environmentlist, select Test .

      5. From the Criticalitylist, select Low .

      6. In the Scopearea, from the Application scopelist, select Regional .

    3. Click Create Application.

      The system creates the application draft.

    Configure components

    1. In the design canvas, click cloud-run-1and do the following in the Configurationarea:

      1. From the Project IDlist, select the descendant project you created in Before you begin .

      2. In the Service Namefield, enter frontend-service .

      3. Click Save.

    2. In the design canvas, click cloud-run-2and do the following in the Configurationarea:

      1. From the Project IDlist, select the descendant project you created in Before you begin .

      2. In the Service Namefield, enter backend-service .

      3. Click Save.

    3. In the design canvas, click sql-postgresql-1and do the following in the Configurationarea:

      1. From the Project IDlist, select the descendant project you created in Before you begin .

      2. In the Namefield, enter database-postgresql .

      3. From the Database Versionlist, select POSTGRES_15 .

      4. From the Zonedrop-down list, select us-central1-a .

      5. Click Save.

      The canvas displays a green check mark in each component to convey that you have specified the required parameters. You can now deploy the application draft to the Test environment for verification.

    Deploy the application

    1. Click Deploy .

    2. In the Select a service accountarea, do the following:

      1. Click Create a new service account.

      2. Click Proceed.

    3. Click Deploy.

      After a few minutes, the system deploys the application and creates resources in your project. The system displays the following details:

      • A link to App Hub, where you can view deployed resource details, including links to monitoring dashboards.
      • Links to Cloud Build logs, which you can use to troubleshoot deployment errors.
      • Outputs like service URIs are displayed, which you can use to interact with deployed resources.

    4. To build on this quickstart, see Update an application template and redeploy .

    Clean up

    To avoid incurring charges to your Google Cloud account for the resources used on this page, follow these steps.

    Delete the deployed application

    1. From the navigation menu, click Applications.

      Go to Applications

    2. From the table, click Quickstart three-tier web app.

    3. Click Actionsand select Delete application.

    4. In the Deletefield, enter Quickstart three-tier web app .

    5. Click Delete.

    The system deletes the application, including the following:

    • The application details are removed from App Design Center.
    • The underlying App Hub application is deleted.
    • The underlying resources are deleted.

    Optional: Delete the project

    To delete the descendant project you created in Before you begin , do the following:

    1. In the Google Cloud console, go to the Manage resources page.

      Go to Manage resources

    2. In the project list, select the project that you want to delete, and then click Delete .
    3. At the prompt, type the project ID, and then click Shut down .

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