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App Engine allows developers to focus on what they do best: writing code. Based
on Compute Engine, the App Engine flexible environment
automatically scales your app up and down while also balancing the load.
Runtimes
You can customize these runtimes or provide your own runtime by supplying a
custom Docker image or Dockerfile from the open source community.
Customizable infrastructure - App Engine flexible environment instances
are Compute Engine virtual machines, which means that you can take
advantage of custom libraries, use SSH for debugging, and deploy your own
Docker containers.
Performance options - Take advantage of a wide array of CPU and memory
configurations. You can specify how much CPU and memory each instance of your
application needs, and the App Engine flexible environment provisions the necessary
infrastructure for you.
Native feature support - Features such as microservices, authorization,
SQL and NoSQL databases, traffic splitting, logging, versioning, security
scanning, and content delivery networks are natively supported.
Instances are health-checked, healed as necessary, and co-located with other
services within the project.
Critical, backwards compatible updates are automatically applied to the
underlying operating system.
VM instances are automatically located by geographical region according to
the settings in your project. Google's management services ensure that all
of a project's VM instances are co-located for optimal performance.
All flexible instances may be restarted on a weekly basis if there are
updates available. This schedule is not guaranteed. During restarts,
Google's management services apply any necessary operating system and
security updates.
You always have root access to Compute Engine VM instances. SSH access to VM
instances in the App Engine flexible environment is disabled by default. If you choose,
you can enable root access to your app's VM instances.
Auto scaling - App Engine automatically scales your application
based on incoming load.
App Engine respects any Compute Engine VM reservations that you
already have in a region that match your configuration. Having a VM
reservation increases the likelihood that you will receive a resource
allocation during a
temporary resource shortage.
If you're new to Google Cloud, create an account to evaluate how
App Engine performs in real-world
scenarios. New customers also get $300 in free credits to run, test, and
deploy workloads.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-01 UTC."],[[["\u003cp\u003eApp Engine's flexible environment, built on Compute Engine, automatically scales applications and balances load, allowing developers to focus on coding.\u003c/p\u003e\n"],["\u003cp\u003eIt supports a variety of runtimes, including Go, Java, Node.js, PHP, Python, Ruby, .NET, and custom runtimes via Docker.\u003c/p\u003e\n"],["\u003cp\u003eThe environment provides customizable infrastructure, allowing for custom libraries, SSH debugging, and deployment of Docker containers.\u003c/p\u003e\n"],["\u003cp\u003eApp Engine natively supports features like microservices, databases, traffic splitting, logging, versioning, security scanning, and content delivery networks.\u003c/p\u003e\n"],["\u003cp\u003eIt manages virtual machines, ensures health checks, applies critical updates automatically, and automatically scales applications based on load.\u003c/p\u003e\n"]]],[],null,["# App Engine flexible environment\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\nApp Engine allows developers to focus on what they do best: writing code. Based\non [Compute Engine](/compute), the App Engine flexible environment\nautomatically scales your app up and down while also balancing the load.\n\nRuntimes\n--------\n\nYou can customize these runtimes or provide your own runtime by supplying a\ncustom Docker image or Dockerfile from the open source community. \n[Go](/appengine/docs/flexible/go/runtime) \n[Java](/appengine/docs/flexible/java/runtime) \n[Node.js](/appengine/docs/flexible/nodejs/runtime) \n[PHP](/appengine/docs/flexible/php/runtime) \n[Python](/appengine/docs/flexible/python/runtime) \n[Ruby](/appengine/docs/flexible/ruby/runtime) \n[.NET](/appengine/docs/flexible/dotnet/runtime) \n[Custom runtimes](/appengine/docs/flexible/custom-runtimes/about-custom-runtimes)\n\nFeatures\n--------\n\n- **Customizable infrastructure** - App Engine flexible environment instances\n are [Compute Engine](/compute) virtual machines, which means that you can take\n advantage of custom libraries, use SSH for debugging, and deploy your own\n Docker containers.\n\n- **Performance options** - Take advantage of a wide array of CPU and memory\n configurations. You can specify how much CPU and memory each instance of your\n application needs, and the App Engine flexible environment provisions the necessary\n infrastructure for you.\n\n- **Native feature support** - Features such as microservices, authorization,\n SQL and NoSQL databases, traffic splitting, logging, versioning, security\n scanning, and content delivery networks are natively supported.\n\n- **Managed virtual machines** - App Engine manages your virtual machines,\n ensuring that:\n\n - Instances are health-checked, healed as necessary, and co-located with other services within the project.\n - Critical, backwards compatible updates are automatically applied to the underlying operating system.\n - VM instances are automatically located by geographical region according to the settings in your project. Google's management services ensure that all of a project's VM instances are co-located for optimal performance.\n - All flexible instances may be restarted on a weekly basis if there are updates available. This schedule is not guaranteed. During restarts, Google's management services apply any necessary operating system and security updates.\n - You always have root access to Compute Engine VM instances. SSH access to VM instances in the App Engine flexible environment is disabled by default. If you choose, you can enable root access to your app's VM instances.\n- **Auto scaling** - App Engine automatically scales your application\n based on incoming load.\n\n - App Engine respects any Compute Engine VM reservations that you already have in a region that match your configuration. Having a VM reservation increases the likelihood that you will receive a resource allocation during a [temporary resource shortage](/compute/docs/troubleshooting/troubleshooting-resource-availability).\n\nLearn about the\n[differences between the standard environment and the flexible environment](/appengine/docs/the-appengine-environments).\n\nTry it for yourself\n-------------------\n\n\nIf you're new to Google Cloud, create an account to evaluate how\nApp Engine performs in real-world\nscenarios. New customers also get $300 in free credits to run, test, and\ndeploy workloads.\n[Try App Engine free](https://console.cloud.google.com/freetrial)"]]
