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Update flask version. Use docker discover host instead of using a environment variable way. Remove unnecessary files. In the endpoint /info, add the container id.
Signed-off-by: Dany Savard <dany.savard@gmail.com>
This commit is contained in:
Dany Savard
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e6b1d2755f
commit
9faad90a8b
10 changed files with 46 additions and 31 deletions
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@ -11,12 +11,10 @@ Project structure:
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│ ├── app.py
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│ ├── Dockerfile
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│ ├── requirements.txt
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│ └── wsgi.py
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└── nginx
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├── default.conf
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├── Dockerfile
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├── nginx.conf
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└── start.sh
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```
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[_compose.yaml_](compose.yaml)
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@ -56,15 +54,15 @@ Listing containers must show two containers running and the port mapping as belo
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```bash
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$ docker ps
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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bde3f29cf571 ...nginx-proxy "/docker-entrypoint.…" About a minute ago Up About a minute (healthy) 0.0.0.0:80->80/tcp ...nginx-proxy_1
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86c44470b547 ...flask-app "gunicorn -w 3 -t 60…" About a minute ago Up About a minute (healthy) 5000/tcp, 0.0.0.0:8000->8000/tcp ...flask-app_1
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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bde3f29cf571 ...nginx-proxy "/docker-entrypoint.…" About a minute ago Up 4 seconds (health: starting) 0.0.0.0:80->80/tcp ...nginx-proxy_1
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86c44470b547 ...flask-app "gunicorn -w 3 -t 60…" About a minute ago Up 5 seconds (health: starting) 0.0.0.0:53323->8000/tcp ...flask-app_1
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```
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After the application starts, navigate to `http://localhost:80` in your web browser or run:
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After the application starts, run the command in a terminal:
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```bash
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$ curl localhost:80
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$ curl localhost
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Hello World!
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```
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@ -79,6 +77,35 @@ Removing nginx-wsgi-flask_flask-app_1 ... done
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Removing network nginx-wsgi-flask_default
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```
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Deploy and scale the application. Create three different instances.
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```bash
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$ docker compose up -d --scale flask-app=3
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✔ Network nginx-wsgi-flask_default Created 0.0s
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✔ Container nginx-wsgi-flask-flask-app-1 Started 0.4s
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✔ Container nginx-wsgi-flask-flask-app-3 Started 0.9s
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✔ Container nginx-wsgi-flask-flask-app-2 Started 0.6s
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✔ Container nginx-wsgi-flask-nginx-proxy-1 Started 1.1s
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```
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See the three different instances.
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```bash
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$ docker ps
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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604ad97b224b nginx-wsgi-flask-nginx-proxy "/docker-entrypoint.…" 5 seconds ago Up 4 seconds (health: starting) 0.0.0.0:80->80/tcp nginx-wsgi-flask-nginx-proxy-1
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317e4d706858 nginx-wsgi-flask-flask-app "gunicorn -w 3 -t 60…" 5 seconds ago Up 5 seconds (health: starting) 0.0.0.0:53323->8000/tcp nginx-wsgi-flask-flask-app-1
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39905ed2b5a0 nginx-wsgi-flask-flask-app "gunicorn -w 3 -t 60…" 5 seconds ago Up 4 seconds (health: starting) 0.0.0.0:53324->8000/tcp nginx-wsgi-flask-flask-app-2
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f98baa201cb6 nginx-wsgi-flask-flask-app "gunicorn -w 3 -t 60…" 5 seconds ago Up 4 seconds (health: starting) 0.0.0.0:53325->8000/tcp nginx-wsgi-flask-flask-app-3
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```
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Each time the url is called, nginx fowards the message to one of three instances. See container id value in the result string.
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``` bash
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$ curl localhost/info
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{"connecting_ip":"172.30.0.1","containe_id":"f98baa201cb6","host":"localhost","proxy_ip":"172.30.0.1","user-agent":"curl/7.79.1"}
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```
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## About
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By following the steps above, you will have an NGINX Reverse Proxy and a Flask backend. The general traffic flow will look like the following:
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@ -2,10 +2,6 @@ services:
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nginx-proxy:
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build: nginx
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restart: always
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volumes:
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- ./nginx/default.conf:/tmp/default.conf
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environment:
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- FLASK_SERVER_ADDR=flask-app:8000
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ports:
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- "80:80"
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depends_on:
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@ -15,12 +11,12 @@ services:
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interval: 10s
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timeout: 10s
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retries: 3
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command: /app/start.sh
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command: nginx -g 'daemon off;'
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flask-app:
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build: flask
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restart: always
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ports:
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- '8000:8000'
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- '8000'
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healthcheck:
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test: ["CMD-SHELL", "curl --silent --fail localhost:8000/flask-health-check || exit 1"]
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interval: 10s
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@ -26,7 +26,4 @@ ENV PATH="$VIRTUAL_ENV/bin:$PATH"
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RUN export FLASK_APP=app.py
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RUN pip install -r requirements.txt
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# define the port number the container should expose
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EXPOSE 5000
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CMD ["python", "app.py"]
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@ -1,4 +1,5 @@
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from flask import Flask, request, jsonify
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import socket
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app = Flask(__name__)
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@ -17,6 +18,7 @@ def info():
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'connecting_ip': request.headers['X-Real-IP'],
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'proxy_ip': request.headers['X-Forwarded-For'],
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'host': request.headers['Host'],
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'containe_id': socket.gethostname(),
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'user-agent': request.headers['User-Agent']
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}
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@ -1,2 +1,2 @@
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Flask==1.1.1
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gunicorn==20.0.4
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Flask==2.3.2
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gunicorn==21.0.1
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@ -1,5 +0,0 @@
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from app import app
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import os
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if __name__ == "__main__":
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app.run(host='0.0.0.0', port=os.environ.get("FLASK_SERVER_PORT"), debug=True)
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@ -5,7 +5,8 @@ RUN apk add bash
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# Add nginx.conf to container
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COPY --chown=nginx:nginx nginx.conf /etc/nginx/nginx.conf
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COPY --chown=nginx:nginx start.sh /app/start.sh
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COPY --chown=nginx:nginx default.conf /etc/nginx/conf.d/default.conf
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# COPY --chown=nginx:nginx start.sh /app/start.sh
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# set workdir
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WORKDIR /app
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@ -29,4 +30,5 @@ RUN touch /var/run/nginx.pid && chown -R nginx:nginx /var/run/nginx.pid
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USER nginx
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CMD ["nginx", "-g", "'daemon off;'"]
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# CMD ["nginx", "-g", "'daemon off;'"]
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CMD ["bash"]
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@ -4,14 +4,14 @@ server {
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listen 80;
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location / {
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proxy_pass http://$FLASK_SERVER_ADDR;
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proxy_pass http://flask-app:8000;
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proxy_set_header Host $host;
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proxy_set_header X-Real-IP $remote_addr;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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}
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location /cache-me {
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proxy_pass http://$FLASK_SERVER_ADDR;
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proxy_pass http://flask-app:8000;
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proxy_cache cache;
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proxy_cache_lock on;
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proxy_cache_valid 200 30s;
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@ -25,5 +25,4 @@ server {
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add_header Content-Type text/plain;
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return 200 "success";
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}
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}
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@ -46,5 +46,4 @@ http {
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# ssl_session_tickets off;
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include /etc/nginx/conf.d/*.conf;
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}
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@ -1,2 +0,0 @@
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#!/bin/bash
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envsubst '$FLASK_SERVER_ADDR' < /tmp/default.conf > /etc/nginx/conf.d/default.conf && nginx -g 'daemon off;'
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