How to Build & Run for Host Nginx

Build the Image#

docker build -t my-flask-app:1.0 .

Run the Container Bound to Localhost#

docker run -d \
  --name flask-app \
  --restart unless-stopped \
  -p 127.0.0.1:5000:5000 \
  my-flask-app:1.0

Verify Host Port Security:#

Check that port 5000 is bound strictly to 127.0.0.1 and not 0.0.0.0:#

sudo netstat -tulpn | grep 5000
# OR
sudo ss -tulpn | grep 5000

# 1. Symlink configuration if not already done#

sudo ln -sf /etc/nginx/sites-available/example.com /etc/nginx/sites-enabled/

2. Verify Nginx configuration syntax#

sudo nginx -t

3. Reload Nginx#

sudo systemctl reload nginx