Deploy a FastAPI App

You can find the step-by-step deployment guide here.

Application Build

Hostman uses the following environment when building a FastAPI application:

• Python 3.10, 3.11, 3.12, 3.13, or 3.14
• pip
• gunicorn
• System libraries for working with PostgreSQL and MySQL

Hostman will execute the following commands during the build:

apt-get install -y python3 python3-pip gunicorn python3-psycopg2 libpq-dev python-dev default-mysql-client python3-dev default-libmysqlclient-dev python3-mysqldb --fix-missing
pip3 install psycopg2 django
ln /usr/bin/python3 /usr/bin/python -sf
ln /usr/bin/pip3 /usr/bin/pip -sf

To install dependencies, add the following line to the build command:

pip3 install --upgrade -r requirements.txt

The default start command is:

uvicorn main:app --host 0.0.0.0

If necessary, you can specify a port, for example:

uvicorn main:app --host 0.0.0.0 --port 80

Requirements

• Make sure the application initialization file is named main.py.
• Make sure the application is listening on 0.0.0.0 rather than 127.0.0.1; otherwise, external connections will not work.