Defining Runtime Settings

A Node.js app in App Engine is configured through a file named app.yaml, that contains runtime, handlers, scaling, and other general settings including environment variables.

About app.yaml files

Specify all the runtime configuration for your Node.js app, including versions and URLs, in the app.yaml file. An individual app.yaml file acts as a descriptor for the deployment of a version of a service . You must first create the app.yaml file for the default service of your app before you can create and deploy app.yaml files for additional services.

You can specify a unique name for your app.yaml files, but then you must specify the file name with the deployment command as well. For example, if you name your app.yaml file service-name-app.yaml or app.standard.yaml, then you must deploy your app using either:

gcloud app deploy service-name-app.yaml
gcloud app deploy app.standard.yaml
To learn more about structuring multiple services and app.yaml files in your app, see Structuring Web Services.

Generally, your app.yaml file requires only the runtime element for a simple Node.js app in the standard environment, for example:

runtime: nodejs8
The syntax of the app.yaml file is in the YAML format.

All configuration elements

For a complete list of all the supported elements in this configuration file, see the app.yaml reference.

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App Engine standard environment for Node.js docs