Deploying Flask to AWS

deploy_aws.sh

#!/bin/bash
CURRENT_ID=$(dig +short myip.opendns.com @resolver1.opendns.com)

read -p "Server Name [$CURRENT_ID]: " SERVER_NAME
SERVER_NAME=${SERVER_NAME:-${CURRENT_ID}}

CURRENT_WORK_DIR=$(pwd)
read -e -p "Working Directory [$CURRENT_WORK_DIR]: " WORKING_DIR
WORKING_DIR=${WORKING_DIR:-${CURRENT_WORK_DIR}}
read -e -p "GUnicorn Executable (i.e. /usr/bin/gunicorn): " GUNICORN_EXEC
GUNICORN_EXEC=$(readlink -f ${GUNICORN_EXEC})

read -p "Flask Executable (i.e. app:app): " FLASK_APP


echo "Installing NGINX"
sudo apt install -y nginx

echo "Writing to /etc/nginx/sites-enabled/flask_aws"
sudo bash -c "cat <<EOF > /etc/nginx/sites-enabled/flask_aws
server {
    listen 80;
    server_name ${SERVER_NAME};

    location / {
        proxy_pass http://unix:${WORKING_DIR}/flask_aws.sock;
    }

}
EOF"

echo "Restarting NGINX"
sudo service nginx restart

echo "Adding Flask App as a Service"
sudo bash -c "cat <<EOF > /etc/systemd/system/flask_aws.service
[Unit]
Description=AWS Flask app
After=network.target
[Service]
User=ubuntu
Group=www-data
WorkingDirectory=${WORKING_DIR}
ExecStart=${GUNICORN_EXEC} --bind unix:flask_aws.sock ${FLASK_APP}
EOF"

echo "Adding and Reloading Service"
sudo systemctl daemon-reload
sudo service flask_aws restart
sudo service nginx restart

echo "Done"