Revize 9832694f

#8219 - Dockerization improvements and gunicorn WSGI implementation

- when using docker to run the application nginx proxy is now used (app is then available at localhost:80)

app.py

@@ -13 +13 @@
     host = "0.0.0.0"
     port = 5000
 
+    # TODO better load this from config.py
     if "FLASK_HOST" in os.environ:
         host = os.environ["FLASK_HOST"]
 

docker-compose.yml

@@ -1 @@
-version: '3.3'
+version: '3.7'
+
+networks:
+    web:
+
 services:
-    server:
+    nginx:
+        restart: unless-stopped
         build:
-            dockerfile: docker/Dockerfile
             context: .
+            dockerfile: docker/nginx/Dockerfile
+        networks:
+            - web
         ports:
-            - '5000:5000'
+            - 80:80
+    gunicorn:
+        restart: unless-stopped
+        build:
+            context: .
+            dockerfile: docker/gunicorn/Dockerfile
+        networks:
+            - web

docker/Dockerfile

@@ -1 @@
-FROM python:3.8.5-slim-buster 
-
-WORKDIR /usr/src/app
-
-# copy application dependency list
-COPY requirements.txt ./
-
-# install application dependencies
-RUN pip install --no-cache-dir -r requirements.txt
-
-# copy the whole application
-COPY . .
-
-# run the application
-CMD [ "python", "./app.py" ]

docker/gunicorn/Dockerfile

@@ +1 @@
+FROM python:3.8.5-slim-buster 
+
+WORKDIR /usr/src/app
+
+# copy the whole application
+COPY . .
+
+# upgrade pip, install gunicorn and app dependencies
+RUN \
+    pip3 install --upgrade pip && \
+    pip3 install gunicorn && \
+    pip3 install --no-cache-dir -r requirements.txt
+
+# expose port 8000
+# TODO could be loaded from env vars
+EXPOSE 8000
+
+# run the application via gunicorn WSGI
+CMD ["gunicorn", "-c", "docker/gunicorn/config.py", "wsgi:flask_app"]

docker/gunicorn/config.py

@@ +1 @@
+bind = '0.0.0.0'

docker/nginx/Dockerfile

@@ +1 @@
+FROM nginx:1.19-alpine
+
+COPY docker/nginx/application.conf /etc/nginx/conf.d/default.conf
+
+# TODO copy only static resources
+COPY . /app
+
+WORKDIR /app

docker/nginx/application.conf

@@ +1 @@
+server {
+    listen       80;
+    listen  [::]:80;
+
+    location / {
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+
+        proxy_redirect off;
+        proxy_pass http://gunicorn:8000;
+    }
+
+    location = /50x.html {
+        root   /usr/share/nginx/html;
+    }
+}

static/test.txt

@@ +1 @@
+test

wsgi.py

@@ +1 @@
+from app import app as flask_app
+
+
+if __name__ == "__main__":
+    flask_app.run()