Dockerized nginx as reverse proxy

nginx.conf

events {}

http {
  upstream webapp {
    server host.docker.internal:3000; # development only
  }

  server {
    listen 80;
    server_name localhost;

    location / {
      proxy_pass http://webapp;
      proxy_set_header X-Forwarded-For $remote_addr; # reset X-Forwarded-For
    }
  }
}

script

# map port 8080 (host) to 80 (docker)
docker run \
  --name my-nginx \
  -v $PWD/nginx.conf:/etc/nginx/nginx.conf:ro \
  -d \
  --rm \
  -p 8080:80 \
  nginx