Note: SomeRuby runtimes have reachedend of support. You cannot re-deployversions that use runtimes after their end of support date. We recommend thatyouupgrade your appto use the latest version of Ruby.

An App Engine app is configured using anapp.yamlfile, that contains CPU, memory, network and disk resources, scaling, and othergeneral settings including environment variables.

Aboutapp.yaml files

You must first create theapp.yaml file for thedefault service of your appbefore you can create and deployapp.yaml files for additional services.

The followingapp.yaml demonstrates how to configure your app to use the latestRuby version. To use any othersupported version of Ruby,you must update yourapp.yaml file. For more information, seeRuby runtime.

runtime:rubyenv:flexentrypoint:bundle exec ruby app.rbruntime_config:operating_system:ubuntu22# This sample incurs costs to run on the App Engine flexible environment.# The settings below are to reduce costs during testing and are not appropriate# for production use. For more information, see:# https://cloud.google.com/appengine/docs/flexible/ruby/configuring-your-app-with-app-yamlmanual_scaling:instances:1resources:cpu:1memory_gb:0.5disk_size_gb:10

Depending on the complexity of your app's service, you might only need to definea few elements in the correspondingapp.yaml file. The following exampledemonstrates what a simple Ruby app might require in theflexible environment:

You can specify a unique name for yourapp.yaml files, but then you mustspecify the file name with thedeploymentcommandas well. For example, if you name yourapp.yaml fileservice-name-app.yamlorapp.flexible.yaml, then you must deploy your app using either:

gcloudappdeployservice-name-app.yamlgcloudappdeployapp.flexible.yaml

All configuration elements

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