Install Apache Airflow into a pipx venv with the correct requirements.

airflow_pipx_install.sh

# assuming pipx is already installed
# https://pipxproject.github.io/pipx/installation/

# airflow needs a home, ~/airflow is the default,
# but you can lay foundation somewhere else if you prefer
# (optional)
export AIRFLOW_HOME=~/airflow

AIRFLOW_VERSION=2.0.1
PYTHON_VERSION="$(python3 --version | cut -d " " -f 2 | cut -d "." -f 1-2)"
# For example: 3.6
CONSTRAINT_URL="https://raw.githubusercontent.com/apache/airflow/constraints-${AIRFLOW_VERSION}/constraints-${PYTHON_VERSION}.txt"
# For example: https://raw.githubusercontent.com/apache/airflow/constraints-2.0.1/constraints-3.9.txt
pipx install "apache-airflow==${AIRFLOW_VERSION}" --pip-args="--constraint '${CONSTRAINT_URL}'"

# initialize the database
airflow db init

airflow users create \
    --username admin \
    --firstname Peter \
    --lastname Parker \
    --role Admin \
    --email [email protected]

# start the web server, default port is 8080
airflow webserver --port 8080 -D

# start the scheduler
# open a new terminal or else run webserver with ``-D`` option to run it as a daemon
airflow scheduler

# visit localhost:8080 in the browser and use the admin account you just
# created to login. Enable the example_bash_operator dag in the home page