3.2.4. Importing a codebase from Git to create an application

Procedure

1. In the +Add view, click From Git in the Git Repository tile to see the Import from git form.
2. In the Git section, enter the Git repository URL for the codebase you want to use to create an application. For example, enter the URL of this sample Node.js application https://github.com/sclorg/nodejs-ex. The URL is then validated.

3. Optional: You can click Show Advanced Git Options to add details such as:

   • Git Reference to point to code in a specific branch, tag, or commit to be used to build the application.
   • Context Dir to specify the subdirectory for the application source code you want to use to build the application.
   • Source Secret to create a Secret Name with credentials for pulling your source code from a private repository.

4. Optional: You can import a Devfile, a Dockerfile, Builder Image, or a Serverless Function through your Git repository to further customize your deployment.

   • If your Git repository contains a Devfile, a Dockerfile, a Builder Image, or a func.yaml, it is automatically detected and populated on the respective path fields.
   • If a Devfile, a Dockerfile, or a Builder Image are detected in the same repository, the Devfile is selected by default.
   • If func.yaml is detected in the Git repository, the Import Strategy changes to Serverless Function.
   • Alternatively, you can create a serverless function by clicking Create Serverless function in the +Add view using the Git repository URL.
   • To edit the file import type and select a different strategy, click Edit import strategy option.
   • If multiple Devfiles, a Dockerfiles, or a Builder Images are detected, to import a specific instance, specify the respective paths relative to the context directory.

5. After the Git URL is validated, the recommended builder image is selected and marked with a star. If the builder image is not auto-detected, select a builder image. For the https://github.com/sclorg/nodejs-ex Git URL, by default the Node.js builder image is selected.

   1. Optional: Use the Builder Image Version drop-down to specify a version.
   2. Optional: Use the Edit import strategy to select a different strategy.
   3. Optional: For the Node.js builder image, use the Run command field to override the command to run the application.

6. In the General section:

   1. In the Application field, enter a unique name for the application grouping, for example, myapp. Ensure that the application name is unique in a namespace.

   2. The Name field to identify the resources created for this application is automatically populated based on the Git repository URL if there are no existing applications. If there are existing applications, you can choose to deploy the component within an existing application, create a new application, or keep the component unassigned.

      참고

      The resource name must be unique in a namespace. Modify the resource name if you get an error.

7. In the Resources section, select:

   • Deployment, to create an application in plain Kubernetes style.
   • Deployment Config, to create an OpenShift Container Platform style application.

   • Serverless Deployment, to create a Knative service.

     참고

     To set the default resource preference for importing an application, go to User Preferences Applications Resource type field. The Serverless Deployment option is displayed in the Import from Git form only if the OpenShift Serverless Operator is installed in your cluster. The Resources section is not available while creating a serverless function. For further details, refer to the OpenShift Serverless documentation.

8. In the Pipelines section, select Add Pipeline, and then click Show Pipeline Visualization to see the pipeline for the application. A default pipeline is selected, but you can choose the pipeline you want from the list of available pipelines for the application.

   참고

   The Add pipeline checkbox is checked and Configure PAC is selected by default if the following criterias are fulfilled:

   • Pipeline operator is installed
   • pipelines-as-code is enabled
   • .tekton directory is detected in the Git repository

9. Add a webhook to your repository. If Configure PAC is checked and the GitHub App is set up, you can see the Use GitHub App and Setup a webhook options. If GitHub App is not set up, you can only see the Setup a webhook option:

   1. Go to Settings Webhooks and click Add webhook.
   2. Set the Payload URL to the Pipelines as Code controller public URL.
   3. Select the content type as application/json.
   4. Add a webhook secret and note it in an alternate location. With openssl installed on your local machine, generate a random secret.
   5. Click Let me select individual events and select these events: Commit comments, Issue comments, Pull request, and Pushes.
   6. Click Add webhook.

10. Optional: In the Advanced Options section, the Target port and the Create a route to the application is selected by default so that you can access your application using a publicly available URL.

    If your application does not expose its data on the default public port, 80, clear the check box, and set the target port number you want to expose.

11. Optional: You can use the following advanced options to further customize your application:

    Routing

    By clicking the Routing link, you can perform the following actions:

    • Customize the hostname for the route.
    • Specify the path the router watches.
    • Select the target port for the traffic from the drop-down list.

    • Secure your route by selecting the Secure Route check box. Select the required TLS termination type and set a policy for insecure traffic from the respective drop-down lists.

      참고

      For serverless applications, the Knative service manages all the routing options above. However, you can customize the target port for traffic, if required. If the target port is not specified, the default port of 8080 is used.

    Domain mapping

    If you are creating a Serverless Deployment, you can add a custom domain mapping to the Knative service during creation.

    • In the Advanced options section, click Show advanced Routing options.

      • If the domain mapping CR that you want to map to the service already exists, you can select it from the Domain mapping drop-down menu.
      • If you want to create a new domain mapping CR, type the domain name into the box, and select the Create option. For example, if you type in example.com, the Create option is Create "example.com".

    Health Checks

    Click the Health Checks link to add Readiness, Liveness, and Startup probes to your application. All the probes have prepopulated default data; you can add the probes with the default data or customize it as required.

    To customize the health probes:

    • Click Add Readiness Probe, if required, modify the parameters to check if the container is ready to handle requests, and select the check mark to add the probe.
    • Click Add Liveness Probe, if required, modify the parameters to check if a container is still running, and select the check mark to add the probe.

    • Click Add Startup Probe, if required, modify the parameters to check if the application within the container has started, and select the check mark to add the probe.

      For each of the probes, you can specify the request type - HTTP GET, Container Command, or TCP Socket, from the drop-down list. The form changes as per the selected request type. You can then modify the default values for the other parameters, such as the success and failure thresholds for the probe, number of seconds before performing the first probe after the container starts, frequency of the probe, and the timeout value.

    Build Configuration and Deployment

    Click the Build Configuration and Deployment links to see the respective configuration options. Some options are selected by default; you can customize them further by adding the necessary triggers and environment variables.

    For serverless applications, the Deployment option is not displayed as the Knative configuration resource maintains the desired state for your deployment instead of a DeploymentConfig resource.

    Scaling

    Click the Scaling link to define the number of pods or instances of the application you want to deploy initially.

    If you are creating a serverless deployment, you can also configure the following settings:

    • Min Pods determines the lower limit for the number of pods that must be running at any given time for a Knative service. This is also known as the minScale setting.
    • Max Pods determines the upper limit for the number of pods that can be running at any given time for a Knative service. This is also known as the maxScale setting.
    • Concurrency target determines the number of concurrent requests desired for each instance of the application at a given time.
    • Concurrency limit determines the limit for the number of concurrent requests allowed for each instance of the application at a given time.
    • Concurrency utilization determines the percentage of the concurrent requests limit that must be met before Knative scales up additional pods to handle additional traffic.
    • Autoscale window defines the time window over which metrics are averaged to provide input for scaling decisions when the autoscaler is not in panic mode. A service is scaled-to-zero if no requests are received during this window. The default duration for the autoscale window is 60s. This is also known as the stable window.

    Resource Limit

    Click the Resource Limit link to set the amount of CPU and Memory resources a container is guaranteed or allowed to use when running.

    Labels

    Click the Labels link to add custom labels to your application.

12. Click Create to create the application and a success notification is displayed. You can see the build status of the application in the Topology view.