How to deploy applications using Docker containerization in FastAPI

How to use Docker containerization to deploy applications in FastAPI

Introduction:
Docker is a containerization technology that packages applications and their dependencies into a self-contained, portable containers for rapid deployment and expansion. FastAPI is a modern, high-performance web framework based on Python that provides a simple and fast API development experience. This article will introduce how to use Docker containerization to deploy applications in FastAPI and provide corresponding code examples.

Step 1: Create a FastAPI application
First, we need to create a simple FastAPI application. Here is a simple example:

from fastapi import FastAPI

app = FastAPI()

@app.get("/")
def read_root():
    return {"Hello": "World"}

In the above code, we have created a basic FastAPI application that will return a JSON response when the user accesses the application through the root path.

Step 2: Write Dockerfile
Next, we need to write a Dockerfile, which is used to build the Docker image. Create a file named Dockerfile in the root directory of the project and add the following content:

FROM tiangolo/uvicorn-gunicorn-fastapi:python3.7

COPY ./app /app

WORKDIR /app

RUN pip install -r requirements.txt

CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "80"]

In the above Dockerfile, we first selected a base image tiangolo/uvicorn-gunicorn-fastapi suitable for FastAPI: python3.7. Then, we copy the app folder in the project directory to the /app directory of the container, and set the working directory to /app. Next, we install the application’s dependencies by running pip install -r requirements.txt. Finally, we launch the application using the CMD command.

Step 3: Build the Docker image
In the command line, switch to the root directory of the project and execute the following command to build the Docker image:

docker build -t fastapi-app .

The above command will use the Dockerfile to build A Docker image named fastapi-app. '.' means the Dockerfile is located in the current directory.

Step 4: Run the Docker container
After building the Docker image, we can use the following command to run the Docker container:

docker run -d -p 80:80 fastapi-app

In the above command, -d means running in daemon mode Container, -p 80:80 means mapping port 80 of the host to port 80 of the container, and fastapi-app means the Docker image to be run.

Now, we have successfully containerized the FastAPI application and run it through Docker.

Conclusion:
By containerizing FastAPI applications, we can achieve rapid deployment and scaling. Docker containers make it easy to package an application and its dependencies into a self-contained, portable container, reducing deployment and configuration complexity. This article describes how to use Docker containerization to deploy applications in FastAPI and provides corresponding code examples. Hope this article helps you!

The above is the detailed content of How to deploy applications using Docker containerization in FastAPI. For more information, please follow other related articles on the PHP Chinese website!