Práctica - Flask App en EC2

Pasos

Instalar app flask
Ejectar con Gunicorn
Configurar Gunicorn como servicio
Configurar Apache o Nginx como proxy inverso

Gunicorn y Flask

Conexión con Putty

https://docs.aws.amazon.com/es_es/AWSEC2/latest/UserGuide/putty.html

Apapche / Nginx proxy inverso

https://akira3030.github.io/formacion/articulos/python-flask-gunicorn-docker.html

Requisitos

App a instalar https://github.com/DAW-distancia/Weather-App

# /etc/systemd/system/temperaturas.service
[Unit]
Description=Gunicorn daemon to serve my flaskapp
After=network.target

[Service]
User=ec2-user
#Group=apache
WorkingDirectory=/home/ec2-user/Weather-App
ExecStart=/home/ec2-user/Weather-App/env/bin/gunicorn -w 2 -b 127.0.0.1:8080 run:app
ExecReload=/bin/kill -s HUP $MAINPID

[Install]
WantedBy=multi-user.target

sudo systemctl daemon-reload 
sudo systemctl restart temperaturas
sudo systemctl status temperaturas

Configurar Apache como proxy inverso

Versión sencilla

# /etc/httpd/conf.d/temperaturas.conf

DocumentRoot "/home/ec2-user/Weather-App"

ProxyPass / http://127.0.0.1:5000/
ProxyPassReverse / http://127.0.0.1:5000/

<Directory /home/ec2-user/Weather-App>
 Require all granted
</Directory>

User Data

Si configuras la instacia (tipo, tamaño, claves, puertos, etc) desde la consola de AWS, puedes añadir un script de arranque que se ejecutará al arrancar la máquina.

#!/bin/bash
yum update -y
yum install -y httpd git
#Apache
systemctl start httpd
systemctl enable httpd
# Tempertaturas
cd /home/ec2-user
git clone https://github.com/DAW-distancia/Weather-App.git
cd Weather-App
python3 -m venv env
source env/bin/activate
pip install -r requirements.txt
# inicializa db
python -c "from weather_app import db; db.create_all()"
# Gunicorn
pip install gunicorn
# Permisos (si no, serán los archivos de root)
chown -R ec2-user:apache /home/ec2-user/Weather-App
# Servicio
cat <<EOF > /etc/systemd/system/temperaturas.service
[Unit]
Description=Gunicorn daemon to serve my flaskapp    
After=network.target

[Service]
User=ec2-user
#Group=apache
WorkingDirectory=/home/ec2-user/Weather-App
ExecStart=/home/ec2-user/Weather-App/env/bin/gunicorn -w 2 -b 127.0.0.1:8080 run:app
ExecReload=/bin/kill -s HUP $MAINPID

[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl start temperaturas
systemctl enable temperaturas
# Apache
cat <<EOF > /etc/httpd/conf.d/temperaturas.conf
DocumentRoot "/home/ec2-user/Weather-App"

ProxyPass / http://127.0.0.1:8080/
ProxyPassReverse / http://127.0.0.1:8080/

<Directory /home/ec2-user/Weather-App>
 Require all granted
</Directory>
EOF
systemctl restart httpd

Última modificación September 30, 2023: website s3 (9c3f86f)