Nginx/Node/Redis and Flask/Redis Compose example (#222)

* Added Node, Nginx and Redis Project
* Added Flask/Redis

README.md

@@ -30,11 +30,12 @@ a MySQL database.
 - [`NGINX / ASP.NET / MySQL`](https://github.com/docker/awesome-compose/tree/master/nginx-aspnet-mysql) - Sample Nginx reverse proxy with an C# backend using ASP.NET
 - [`NGINX / Flask / MongoDB`](https://github.com/docker/awesome-compose/tree/master/nginx-flask-mongo) - Sample Python/Flask
 application with Nginx proxy and a Mongo database.
-- [`NGINX / Flask / MySQL`](https://github.com/docker/awesome-compose/tree/master/nginx-flask-mysql) - Sample Python/Flask
-application with an Nginx proxy and a MySQL database.
+- [`NGINX / Flask / MySQL`](https://github.com/docker/awesome-compose/tree/master/nginx-flask-mysql) - Sample Python/Flask application with an Nginx proxy and a MySQL database.
+- [`NGINX / Node.js / Redis`](https://github.com/docker/awesome-compose/tree/master/nginx-nodejs-redis) - Sample Node.js application with Nginx proxy and a Redis database
 - [`NGINX / Go`](https://github.com/docker/awesome-compose/tree/master/nginx-golang) - Sample Nginx proxy with a Go backend.
 - [`NGINX / WSGI / Flask`](https://github.com/docker/awesome-compose/tree/master/nginx-wsgi-flask) - Sample Nginx reverse proxy with a Flask backend using WSGI.
 - [`PostgreSQL / pgAdmin`](https://github.com/docker/awesome-compose/tree/master/postgresql-pgadmin) - Sample setup for postgreSQL database with pgAdmin web interface
+- [`Python / Flask / Redis`](https://github.com/docker/awesome-compose/tree/master/flask-redis) - Sample Python/Flask and a Redis database
 - [`React / Spring / MySQL`](https://github.com/docker/awesome-compose/tree/master/react-java-mysql) - Sample React
 application with a Spring backend and a MySQL database.
 - [`React / Express / MySQL`](https://github.com/docker/awesome-compose/tree/master/react-express-mysql) - Sample React

flask-redis/Dockerfile

@@ -0,0 +1,6 @@
+FROM python:3.11.0a6-alpine3.15
+WORKDIR /code
+COPY requirements.txt /code
+RUN pip install -r requirements.txt --no-cache-dir
+COPY . /code
+CMD python app.py

flask-redis/README.md

@@ -0,0 +1,82 @@
+## Compose sample application
+
+### Python/Flask application using a Redis database
+
+Project structure:
+
+```
+.
+├── Dockerfile
+├── README.md
+├── app.py
+├── docker-compose.yml
+└── requirements.txt
+```
+
+[_docker-compose.yml_](docker-compose.yml)
+
+```
+services:
+   redis: 
+     image: redislabs/redismod
+     ports:
+       - '6379:6379' 
+   web:
+        build: .
+        ports:
+            - "5000:5000"
+        volumes:
+            - .:/code
+        depends_on:
+            - redis
+```
+
+## Deploy with docker-compose
+
+```
+$ docker-compose up -d
+[+] Running 24/24
+ ⠿ redis Pulled   
+ ...                                                                                                                                                                                                                                                                                                                                                                                                             
+   ⠿ 565225d89260 Pull complete                                                                                                                                                                                                      
+[+] Building 12.7s (10/10) FINISHED
+ => [internal] load build definition from Dockerfile                                                                                                                                                                                  ...
+[+] Running 3/3
+ ⠿ Network flask-redis_default    Created                                                                                                                                                                                             
+ ⠿ Container flask-redis-redis-1  Started                                                                                                                                                                                             
+ ⠿ Container flask-redis-web-1    Started
+```
+
+## Expected result
+
+Listing containers must show one container running and the port mapping as below:
+```
+
+$ docker-compose ps
+NAME                  COMMAND                  SERVICE             STATUS              PORTS
+flask-redis-redis-1   "redis-server --load…"   redis               running             0.0.0.0:6379->6379/tcp
+flask-redis-web-1     "/bin/sh -c 'python …"   web                 running             0.0.0.0:5000->5000/tcp
+```
+
+After the application starts, navigate to `http://localhost:5000` in your web browser or run:
+```
+$ curl localhost:5000
+This webpage has been viewed 2 time(s)
+```
+
+## Monitoring Redis keys
+
+Connect to redis database by using ```redis-cli``` command and monitor the keys.
+```
+redis-cli -p 6379
+127.0.0.1:6379> monitor
+OK
+1646634062.732496 [0 172.21.0.3:33106] "INCRBY" "hits" "1"
+1646634062.735669 [0 172.21.0.3:33106] "GET" "hits"
+```
+
+
+Stop and remove the containers
+```
+$ docker-compose down
+```

flask-redis/app.py

@@ -0,0 +1,14 @@
+from flask import Flask
+from redis import Redis
+
+app = Flask(__name__)
+redis = Redis(host='redis', port=6379)
+
+@app.route('/')
+def hello():
+    redis.incr('hits')
+    counter = str(redis.get('hits'),'utf-8')
+    return "This webpage has been viewed "+counter+" time(s)"
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", debug=True)

flask-redis/docker-compose.yml

@@ -0,0 +1,13 @@
+services:
+   redis: 
+     image: redislabs/redismod
+     ports:
+       - '6379:6379' 
+   web:
+        build: .
+        ports:
+            - "5000:5000"
+        volumes:
+            - .:/code
+        depends_on:
+            - redis

flask-redis/requirements.txt

@@ -0,0 +1,2 @@
+flask
+redis

nginx-nodejs-redis/README.md

@@ -0,0 +1,108 @@
+## Compose sample application
+
+## Node.js application with Nginx proxy and Redis database
+
+Project structure:
+```
+.
+├── README.md
+├── docker-compose.yml
+├── nginx
+│   ├── Dockerfile
+│   └── nginx.conf
+└── web
+    ├── Dockerfile
+    ├── package.json
+    └── server.js
+
+2 directories, 7 files
+
+
+```
+[_docker-compose.yml_](docker-compose.yml)
+```
+redis:
+    image: 'redislabs/redismod'
+    ports:
+      - '6379:6379'
+  web1:
+    restart: on-failure
+    build: ./web
+    hostname: web1
+    ports:
+      - '81:5000'
+  web2:
+    restart: on-failure
+    build: ./web
+    hostname: web2
+    ports:
+      - '82:5000'
+  nginx:
+    build: ./nginx
+    ports:
+    - '80:80'
+    depends_on:
+    - web1
+    - web2
+```
+The compose file defines an application with four services `redis`, `nginx`, `web1` and `web2`.
+When deploying the application, docker-compose maps port 80 of the nginx service container to port 80 of the host as specified in the file.
+
+
+> ℹ️ **_INFO_**  
+> Redis runs on port 6379 by default. Make sure port 6379 on the host is not being used by another container, otherwise the port should be changed.
+
+## Deploy with docker-compose
+
+```
+$ docker-compose up -d
+[+] Running 24/24
+ ⠿ redis Pulled                                                                                                                                                                                                                      ...
+   ⠿ 565225d89260 Pull complete                                                                                                                                                                                                      
+[+] Building 2.4s (22/25)
+ => [nginx-nodejs-redis_nginx internal] load build definition from Dockerfile                                                                                                                                                         ...
+[+] Running 5/5
+ ⠿ Network nginx-nodejs-redis_default    Created                                                                                                                                                                                      
+ ⠿ Container nginx-nodejs-redis-web2-1   Started                                                                                                                                                                                      
+ ⠿ Container nginx-nodejs-redis-redis-1  Started                                                                                                                                                                                      
+ ⠿ Container nginx-nodejs-redis-web1-1   Started                                                                                                                                                                                      
+ ⠿ Container nginx-nodejs-redis-nginx-1  Started
+```
+
+
+## Expected result
+
+Listing containers must show three containers running and the port mapping as below:
+
+
+```
+docker-compose ps
+```
+
+## Testing the app
+
+After the application starts, navigate to `http://localhost:80` in your web browser or run:
+
+```
+curl localhost:80
+curl localhost:80
+web1: Total number of visits is: 1
+```
+
+```
+curl localhost:80
+web1: Total number of visits is: 2
+```
+```
+$ curl localhost:80
+web2: Total number of visits is: 3
+```
+
+
+
+## Stop and remove the containers
+
+```
+$ docker-compose down
+```
+

nginx-nodejs-redis/docker-compose.yml

@@ -0,0 +1,27 @@
+
+services:
+  redis:
+    image: 'redislabs/redismod'
+    ports:
+      - '6379:6379'
+  web1:
+    restart: on-failure
+    build: ./web
+    hostname: web1
+    ports:
+      - '81:5000'
+  web2:
+    restart: on-failure
+    build: ./web
+    hostname: web2
+    ports:
+      - '82:5000'
+  nginx:
+    build: ./nginx
+    ports:
+    - '80:80'
+    depends_on:
+    - web1
+    - web2
+
+

nginx-nodejs-redis/nginx/Dockerfile

@@ -0,0 +1,3 @@
+FROM nginx:1.21.6
+RUN rm /etc/nginx/conf.d/default.conf
+COPY nginx.conf /etc/nginx/conf.d/default.conf

nginx-nodejs-redis/nginx/nginx.conf

@@ -0,0 +1,12 @@
+upstream loadbalancer {
+  server web1:5000;
+  server web2:5000;
+}
+
+server {
+  listen 80;
+  server_name localhost;
+  location / {
+    proxy_pass http://loadbalancer;
+  }
+}

nginx-nodejs-redis/web/.gitignore

@@ -0,0 +1 @@
+node_modules

nginx-nodejs-redis/web/Dockerfile

@@ -0,0 +1,9 @@
+FROM node:14.17.3-alpine3.14
+
+WORKDIR /usr/src/app
+
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY ./server.js ./
+
+CMD ["npm","start"]

nginx-nodejs-redis/web/package-lock.json

@@ -0,0 +1,408 @@
+{
+  "name": "web",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
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+      "requires": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      }
+    },
+    "array-flatten": {
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+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "http-errors": "1.8.1",
+        "iconv-lite": "0.4.24",
+        "on-finished": "~2.3.0",
+        "qs": "6.9.7",
+        "raw-body": "2.4.3",
+        "type-is": "~1.6.18"
+      }
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+    "bytes": {
+      "version": "3.1.2",
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+}

nginx-nodejs-redis/web/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "web",
+  "version": "1.0.0",
+  "description": "Running Node.js and Express.js on Docker",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "express": "^4.17.2",
+    "redis": "3.1.2"
+  },
+  "author": "",
+  "license": "MIT"
+}

nginx-nodejs-redis/web/server.js

@@ -0,0 +1,24 @@
+const os = require('os');
+const express = require('express');
+const app = express();
+const redis = require('redis');
+const redisClient = redis.createClient({
+  host: 'redis',
+  port: 6379
+});
+
+app.get('/', function(req, res) {
+    redisClient.get('numVisits', function(err, numVisits) {
+        numVisitsToDisplay = parseInt(numVisits) + 1;
+        if (isNaN(numVisitsToDisplay)) {
+            numVisitsToDisplay = 1;
+        }
+       res.send(os.hostname() +': Number of visits is: ' + numVisitsToDisplay);
+        numVisits++;
+        redisClient.set('numVisits', numVisits);
+    });
+});
+
+app.listen(5000, function() {
+    console.log('Web application is listening on port 5000');
+});