entyrpoint.sh

#!/bin/bash

# if any of the commands in your code fails for any reason, the entire script fails
set -o errexit
# fail exit if one of your pipe command fails
set -o pipefail
# exits if any of your variables is not set
set -o nounset

postgres_ready() {
python << END
import sys

import psycopg2

try:
    psycopg2.connect(
        dbname="${DB_NAME}",
        user="${DB_USER}",
        password="${DB_PASSWORD}",
        host="${DB_HOST}",
        port="${DB_PORT}",
    )
except psycopg2.OperationalError:
    sys.exit(-1)
sys.exit(0)

END
}
until postgres_ready; do
  >&2 echo 'Waiting for PostgreSQL to become available...'
  sleep 1
done
>&2 echo 'PostgreSQL is available'

exec "$@"


#
#python manage.py makemigrations
#python manage.py migrate
#python manage.py collectstatic --noinput
#python manage.py runserver 0:8042
#gunicorn root.wsgi:application --bind 0.0.0.0:8001