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Deploying FastAPI app with Google Cloud Run

#fastapi #cloudrun

Introduction

This post explains how to deploy a FastAPI app using Google Cloud Run.

Prerequisites

  • Google Cloud account
  • gcloud CLI
  • Docker
  • Python

Project setup

Create a FastAPI app using Poetry.

pip install poetry poetry new sample cd sample mv sample app cd app poetry add fastapi poetry add 'uvicorn[standard]'
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Create app/main.py

touch app/main.py
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Edit main.py as follows

# main.py from fastapi import FastAPI app = FastAPI() @app.get("/", tags=["root"]) async def root(): return {"message": "Hello World"}
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Run it in uvicorn

poetry shell uvicorn app.main:app --reload
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Google Cloud Run setup

If you have already installed gcloud CLI, update it as follows.

gcloud components update
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Connect the gcloud CLI to your GCP account.

gcloud auth login
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Set up your project ID

gcloud config set project PROJECT_ID
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Region settings

gcloud config set run/region REGION
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Docker settings

gcloud auth configure-docker
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Prepare Dockerfile in the same hierarchy as the app directory.

FROM python:3.11.3 ENV PYTHONUNBUFFERED True RUN pip install --upgrade pip COPY requirements.txt . RUN pip install --no-cache-dir -r requirements.txt ENV APP_HOME /root WORKDIR $APP_HOME COPY /app $APP_HOME/app EXPOSE 8080 CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8080"]
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Prepare requirements.txt file for Dockerfile.
(In this case, use requirements.txt in the Dockerfile.)

poetry export -f requirements.txt --output requirements.txt
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Now that it is ready, deploy to Cloud Run.

gcloud run deploy sample --port 8080 --source .
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If successful, it will be created with the name sample.
A URL will be created, so check the operation.

Conclusion

With the above, you can now deploy your FastAPI app to Google Cloud Run.

Although the details are omitted here, it would be a good idea to actually add CORS and headers in middleware and implement an authentication function such as Firebase Authentication.

Note: The path to import must be specified from the app directory.

Example: app/lib/test.py

# app/main.py from app.lib import test
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