Learn how to run your application locally, deploy it, and test on App Engine.
To test your application's functionality before deploying, run your application in your local environment with the development tools that you usually use.For example,
Deploying your application
Deploy your application to App Engine using the
gcloud app deploy
To programmatically deploy your apps, use the Admin API.
Before you begin
Before you can deploy your application:
Ensure that your user account includes the required privileges.
Deploying a service
You deploy your application to App Engine by deploying versions of your application's services and each of their configuration files.
To deploy a version of your application's service, run the following command
from the directory where the
app.yaml file of your service is located:
gcloud app deploy
Specifying no files with the command deploys only the
app.yaml file in your
current directory. By default, the
deploy command generates a unique ID
for the version that you deploy, deploys the version to the
GCP project you configured the
gcloud tool to use, and
routes all traffic to the new version.
You can change the default behavior of the command by targeting specific files or including additional parameters:
To deploy the other configuration files of your service, you must target and deploy each file separately. For example:
gcloud app deploy cron.yaml gcloud app deploy dispatch.yaml gcloud app deploy index.yaml
To specify a custom version ID, use the
To prevent traffic from being automatically routed to the new version, use the
To deploy to a specific GCP project, use the
For example, to deploy the service defined by
app.yaml to a specific
GCP project, assign it a custom version ID, and
prevent traffic from being routed to the new version:
gcloud app deploy --project PROJECT_ID --version VERSION_ID --no-promote
For more information about this command, see the
gcloud app deploy reference.
Deploying multiple services
You use the same deployment command for deploying or updating the multiple services that make up your application.
To deploy multiple services, you must separately deploy each service's
app.yaml file. For example:
gcloud app deploy service1/app.yaml gcloud app deploy service2/app.yaml
You can specify multiple files with a single deploy command:
gcloud app deploy service1/app.yaml service2/app.yaml
Requirements for deploying multiple services
You must initially deploy a version of your application to the
defaultservice before you can create and deploy subsequent services.
The ID of each of your services must be specified in their corresponding
app.yamlconfiguration files. To specify the service ID, include the
serviceelement definition in each configuration file. By default, excluding this element definition from your configuration file deploys the version to the
You can use a
file to specify files and directories not to upload to GCP
when you deploy your services. This is useful for ignoring build artifacts
and other files that do not need to be uploaded with your deployment.
.gcloudignorefile in your service's directory, the
gcloudtool automatically creates a default
.gcloudignorefile when you deploy. The default file contains the following:
.gcloudignore .git .gitignore node_modules/
The listed files and directories will not be uploaded to GCP.
Learn more about the syntax of the
.gcloudignore file in the
Managing build images
Each time you deploy a new version, a container image is created using the Cloud Build service. That container image then runs in the App Engine standard environment.
Built container images are stored in the
app-engine folder in
Container Registry. You can
download these images to keep or run elsewhere. Once deployment is
complete, App Engine no longer needs the container images. Note that
they are not automatically deleted, so to avoid reaching your storage
quota, you can safely delete any images you don't need. For more information
about managing images in Container Registry, see the
Container Registry documentation.
Viewing your application
After you deploy your application to App Engine, you can run the
following command to launch your browser and view it at
gcloud app browse
Testing on App Engine
Before configuring a new version to receive traffic, you can test it on
App Engine. For example, to test a new version of your
Deploy your new version and include the
gcloud app deploy --no-promote
Access your new version by navigating to the following URL:
Now you can test your new version in the App Engine runtime environment. You can debug your application by viewing its logs. For more information, see Writing Application Logs.
Requests sent to
http://YOUR_PROJECT_ID.appspot.comwill still be routed to the version previously configured to receive traffic.
When you want to send traffic to the new version, use the GCP Console to migrate traffic:
Select the version you just deployed and click Migrate traffic.
You can use the same process to test new versions of other services
default in the URL with your service's name:
For more information about targeting specific services and versions, see How Requests are Routed.