Region ID
The REGION_ID
is an abbreviated code that Google assigns
based on the region you select when you create your app. The code does not
correspond to a country or province, even though some region IDs may appear
similar to commonly used country and province codes. For apps created after
February 2020, REGION_ID.r
is included in
App Engine URLs. For existing apps created before this date, the
region ID is optional in the URL.
Learn more about region IDs.
Learn how to run your application locally, deploy it, and test on App Engine.
Running locally
To test your application's functionality before deploying, run your application in your local environment with the development tools that you usually use.
Deploying your application
Deploy your application to App Engine by using thegcloud app deploy
command.
Your deployment is automatically built into a container image by the Cloud Build service and then that image is deployed to App Engine flexible environment. The container includes any local modifications that you've made to the runtime image.
To programmatically deploy your apps, use the Admin API.
Before you begin
Before you can deploy your application:
The Owner of the Google Cloud project must set up your Google Cloud project for App Engine.
You must 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.
You can deploy the other configuration files of your service by targeting and deploying 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
--version
flag.To prevent traffic from being automatically routed to the new version, use the
--no-promote
flag.To deploy to a specific Google Cloud project, use the
--project
flag.
For example, to deploy the service defined by app.yaml
to a specific
Google Cloud 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.
Ignoring files
You can use a .gcloudignore
file to specify files and directories not to upload to Google Cloud
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.
Learn more about the syntax of the .gcloudignore
file in the
gcloud
reference.
Manually building a container for deployment
To build your container images outside of Google Cloud, you must
first upload your images to a container image repository before you can deploy
your images to App Engine with the gcloud app deploy
command.
For example, if you build your container images locally with Docker, you can
push those images to Google Container
Registry and then
specify the URL of your image in the --image-url
flag of the command:
gcloud app deploy --image-url gcr.io/YOUR_PROJECT_ID/YOUR_CONTAINER_IMAGE
Using automated continuous deployment pipelines
You can use Cloud Build to automate deployments in continuous deployment pipelines. For more information, see Deploying artifacts and Automating Builds using Build Triggers in the Cloud Build documentation.
Docker base images
If you'd like to build a custom runtime application, see Create a Docker file.
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
https://PROJECT_ID.REGION_ID.r.appspot.com
:
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
default
service:
Deploy your new version and include the
--no-promote
flag:gcloud app deploy --no-promote
Access your new version by navigating to the following URL:
https://VERSION_ID-dot-default-dot-PROJECT_ID.REGION_ID.r.appspot.com
Now you can test your new version in the App Engine runtime environment. You can debug your application by viewing its logs in the Google Cloud console Logs Explorer. For more information, see Writing Application Logs.
Requests sent to
https://PROJECT_ID.REGION_ID.r.appspot.com
will still be routed to the version previously configured to receive traffic.When you want to send traffic to the new version, use the Google Cloud 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
by replacing default
in the URL with your service's name:
https://VERSION-dot-SERVICE-dot-PROJECT_ID.REGION_ID.r.appspot.com
For more information about targeting specific services and versions, see How requests are routed.
Using Cloud Trace
Cloud Trace is useful for understanding how requests propagate through your application. You can inspect detailed latency information for a single request or view aggregate latency for your entire application.
You can view trace details. In the Trace explorer, you can filter by your specific App Engine service and version.
Troubleshooting
The following are common error messages that you might encounter when deploying apps:
PERMISSION_DENIED: Operation not allowed
The "appengine.applications.create" permission is required.
- If the Google Cloud project does not include the required
App Engine
application, the
gcloud app deploy
command can fail when it tries to run thegcloud app create
command. Only accounts with Owner role have the necessary permissions to create App Engine applications. 502 Bad Gateway
- The Google Cloud project can fail to start if the
app.yaml
is misconfigured. Check the app logs for more detailed error messages. [13] An internal error occurred while creating a Cloud Storage bucket.
App Engine creates a default Cloud Storage multi-regional bucket on your behalf on the same region where it creates your application. It requires this bucket to store the contents of your application. The error returns when this bucket cannot be created, such as in the following scenarios:
The App Engine flexible environment service agent is not present in your project or it doesn't have the
App Engine flexible environment Service Agent
role. You can add the agent's service account back into your project by granting it the correct IAM permissions. See Restore a deleted service agent.The default App Engine service account is not present in your project. If the App Engine service account was removed before 30 days had elapsed since its deletion, you can restore it.
Your project is under an organization enforcing the
constraints/gcp.resourceLocations
policy and the organization is not allowing the creation of resources on the same region where your App Engine was created. You must override the enforcedconstraints/gcp.resourceLocations
policy for your project and allow the multi-region locations on the same region where your App Engine app is created.
[13] An internal error occurred.
This error can occur if you are deploying your service with a network configuration that uses a Shared VPC setup. Try the following:
- Ensure that your
app.yaml
configuration is valid. - Ensure that your App Engine flexible environment fulfills all the requirements for a Shared VPC setup. See Using the App Engine flexible environment on a Shared VPC network.
- Be sure that you have configured service accounts present in your project. If not, you must restore the accounts. The subnet region in the Shared VPC host project must match the location where your App Engine environment was created.
- Ensure that your
If the issue persists, redeploy your service by using the Google Cloud SDK. Be sure to add the
--verbosity=debug
flag. Contact Google Cloud Support and provide the command's output.IP space of {USER_SUBNETWORK_NAME} is exhausted and needs to be expanded.
If the deployment fails with this error message, the network configured for the App Engine service doesn't have addresses left to allocate for the new instances of the service. To resolve the issue, expand the VPC ranges on the subnet that is configured for your App Engine flexible environment service.