big bang, seems to be working in docker with nginx + uwsgi + flask

Dockerfile

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+FROM python:3.7-stretch
+
+# Copy python requirements file
+COPY requirements.txt /tmp/requirements.txt
+
+# install dependencies
+RUN apt-get update && apt-get install -y \
+    python-numpy \
+    python-scipy \
+    libffi-dev \
+    libjpeg-turbo-progs \
+    python-setuptools \
+    python-dev \
+    python3-dev \
+    cmake \
+    libtiff5-dev \
+    libjpeg62-turbo-dev \
+    zlib1g-dev \
+    libfreetype6-dev \
+    liblcms2-dev \
+    libwebp-dev \
+    tcl8.6-dev \
+    tk8.6-dev \
+    python-tk \
+    python3-tk \
+    libharfbuzz-dev \
+    libfribidi-dev \
+    nginx \
+    uwsgi \
+    uwsgi-plugin-python3 \
+    supervisor \
+    && pip3 install --upgrade pip setuptools \
+    && pip3 install -r /tmp/requirements.txt \
+    && apt-get clean
+
+
+RUN groupadd -g 999 nginx && \
+    useradd -r -u 999 -g nginx nginx
+
+# Copy the Nginx global conf
+COPY nginx.conf /etc/nginx/
+# Copy the Flask Nginx site conf
+COPY flask-site-nginx.conf /etc/nginx/conf.d/
+# Copy the base uWSGI ini file to enable default dynamic uwsgi process number
+COPY uwsgi.ini /etc/uwsgi/
+# Custom Supervisord config
+COPY supervisord.conf /etc/supervisord.conf
+
+# Add app
+COPY ./src /src
+WORKDIR /src
+
+CMD ["/usr/bin/supervisord"]

docker-compose.yml

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+version: '3'
+services:
+  web:
+    build: .
+    expose:
+      - "5000"
+    ports:
+      - "5000:5000"
+    volumes:
+      - ./:/code:cached

flask-site-nginx.conf

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+server {
+    location / {
+        try_files $uri @yourapplication;
+    }
+    location @yourapplication {
+        include uwsgi_params;
+        uwsgi_pass unix:///tmp/uwsgi.sock;
+    }
+}

nginx.conf

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+# based on default config of nginx 1.12.1
+# Define the user that will own and run the Nginx server
+user nginx;
+# Define the number of worker processes; recommended value is the number of
+# cores that are being used by your server
+# auto will default to number of vcpus/cores
+worker_processes auto;
+
+# altering default pid file location
+pid /tmp/nginx.pid;
+
+# turn off daemon mode to be watched by supervisord
+daemon off;
+
+# Enables the use of JIT for regular expressions to speed-up their processing.
+pcre_jit on;
+
+# Define the location on the file system of the error log, plus the minimum
+# severity to log messages for
+error_log /var/log/nginx/error.log warn;
+
+# events block defines the parameters that affect connection processing.
+events {
+    # Define the maximum number of simultaneous connections that can be opened by a worker process
+    worker_connections  1024;
+}
+
+
+# http block defines the parameters for how NGINX should handle HTTP web traffic
+http {
+    # Include the file defining the list of file types that are supported by NGINX
+    include /etc/nginx/mime.types;
+    # Define the default file type that is returned to the user
+    default_type text/html;
+
+    # Don't tell nginx version to clients.
+    server_tokens off;
+
+    # Specifies the maximum accepted body size of a client request, as
+    # indicated by the request header Content-Length. If the stated content
+    # length is greater than this size, then the client receives the HTTP
+    # error code 413. Set to 0 to disable.
+    client_max_body_size 0;
+
+    # Define the format of log messages.
+    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
+                        '$status $body_bytes_sent "$http_referer" '
+                        '"$http_user_agent" "$http_x_forwarded_for"';
+
+    # Define the location of the log of access attempts to NGINX
+    access_log /var/log/nginx/access.log  main;
+
+    # Define the parameters to optimize the delivery of static content
+    sendfile       on;
+    tcp_nopush     on;
+    tcp_nodelay    on;
+
+    # Define the timeout value for keep-alive connections with the client
+    keepalive_timeout  65;
+
+    # Define the usage of the gzip compression algorithm to reduce the amount of data to transmit
+    #gzip  on;
+
+    # Include additional parameters for virtual host(s)/server(s)
+    include /etc/nginx/conf.d/*.conf;
+}

requirements.txt

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-numpy==1.11.3
-Pillow==4.0.0
+attrs==18.1.0
+click==6.7
+Flask==1.0.2
+itsdangerous==0.24
+Jinja2==2.10
+MarkupSafe==1.0
+numpy==1.14.5
+Pillow==5.2.0
+Werkzeug==0.14.1
+uwsgi

src/app.py

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+import io
+
+from flask import Flask, request, redirect, flash, send_file, render_template_string
+
+from transform import transform
+
+UPLOAD_FOLDER = "/path/to/the/uploads"
+ALLOWED_EXTENSIONS = set(["png", "jpg", "jpeg", "gif"])
+
+app = Flask(__name__)
+app.config["UPLOAD_FOLDER"] = UPLOAD_FOLDER
+
+
+def allowed_file(filename):
+    return "." in filename and filename.rsplit(".", 1)[1].lower() in ALLOWED_EXTENSIONS
+
+
+@app.route("/", methods=["GET", "POST"])
+def upload_file():
+    if request.method == "POST":
+        # check if the post request has the file part
+        if "file" not in request.files:
+            flash("No file part")
+            return redirect(request.url)
+        file = request.files["file"]
+        # if user does not select file, browser also
+        # submit a empty part without filename
+        if file.filename == "":
+            flash("No selected file")
+            return redirect(request.url)
+        if file and allowed_file(file.filename):
+            fout = transform(file_in=file, file_out=io.BytesIO())
+            return send_file(fout, as_attachment=True, attachment_filename="output.png")
+
+    return render_template_string(
+        r"""
+        <!doctype html>
+        <head>
+            <title>Convert An Image</title>
+        </head>
+        <body>
+            <h1>Convert An Image to Text!</h1>
+            {% with messages = get_flashed_messages() %}
+                {% if messages %}
+                    <ul class=flashes>
+                    {% for message in messages %}
+                        <li>{{ message }}</li>
+                    {% endfor %}
+                    </ul>
+                {% endif %}
+            {% endwith %}
+            <p>Note that this may take a minute to process.</p>
+            <form method=post enctype=multipart/form-data>
+                <p>
+                    <input type=file name=file>
+                    <input type=submit value=Upload>
+                </p>
+            </form>
+        </body>
+        """
+    )
+
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0")