Developing your service

This page describes a few things you need to know to get started in developing a service for Cloud Run.

Code requirements

You must meet the following requirements when you develop a service:

  • The service must listen for requests on the port defined by the PORT environment variable.
  • The service must be stateless. It cannot rely on a persistent local state.
  • The service must not perform background activities outside the scope of request handling.

You can find more details about these constraints in the Container Runtime Contract.

Programming language support

Cloud Run allows you to write code in the programming language of your choice.

The build and deploy quickstart page provides samples in many popular languages.

Using a web server

You can use a web server to listen on the required port, and to process and route incoming requests. For example, Node.js developers can use Express.js, Python developers can use Flask, Ruby developers can use Sinatra, and so forth.

Containerizing your code with a Dockerfile

To deploy to Cloud Run, you need to provide a container image. A container image is a packaging format that includes your code, its packages, any needed binary dependencies, the operating system to use, and anything else needed to run your service.

A file named Dockerfile is commonly used to declare how to build the container image. You can find examples of Dockerfiles for popular languages in the build and deploy quickstart.

Dockerfiles very often start from a base image (e.g. FROM golang:1.11). You can find base images maintained by OS and language authors on Docker Hub. If needed, Google Cloud Container Registry provides a Docker Hub mirror. You can also find base images managed by Google in the Cloud Marketplace.

If you bring your own binaries, make sure they are compiled for Linux ABI x86_64.

These resources provide further information on Dockerfiles:

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