Merge branch 'master' of https://github.com/ajeetraina/awesome-compose

Signed-off-by: Ajeet Singh Raina <ajeetraina@gmail.com>

nginx-nodejs-redis/README.md

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+
+## Node.js application with Nginx proxy and Redis database
+
+Project structure:
+```
+.
+├── docker-compose.yml
+├── nginx
+│   ├── Dockerfile
+│   └── nginx.conf
+├── web
+│   ├── Dockerfile
+│   ├── package.json
+│   └── server.js
+├── web1
+│   ├── Dockerfile
+│   ├── package.json
+│   └── server.js
+└── web2
+    ├── Dockerfile
+    ├── package.json
+    └── server.js
+
+4 directories, 12 files
+```
+
+[_docker-compose.yml_](docker-compose.yml)
+```
+version: '3.9'
+services:
+  redis:
+    image: 'redis:alpine'
+    ports:
+      - '6379:6379'
+  web1:
+    restart: on-failure
+    build: ./web1
+    ports:
+      - '81:5000'
+  web2:
+    restart: on-failure
+    build: ./web2
+    ports:
+      - '82:5000'
+  nginx:
+    build: ./nginx
+    ports:
+    - '80:80'
+    depends_on:
+    - web1
+    - web2
+```
+The compose file defines an application with four services `redis`, `web`, `web1` and `web2`.
+When deploying the application, docker-compose maps port 80 of the web 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
+```
+```
+Creating nginx-nodejs-redis_redis_1 ... done
+Creating nginx-nodejs-redis_web1_1  ... done
+Creating nginx-nodejs-redis_web2_1  ... done
+Creating nginx-nodejs-redis_nginx_1 ... done
+```
+
+
+## Expected result
+
+Listing containers must show three containers running and the port mapping as below:
+
+
+```
+docker-compose ps
+           Name                        Command              State           Ports         
+------------------------------------------------------------------------------------------
+nginx-nodejs-redis_nginx_1   /docker-entrypoint.sh ngin     Up      0.0.0.0:80->80/tcp    
+                             ...                                                          
+nginx-nodejs-redis_redis_1   docker-entrypoint.sh redis     Up      0.0.0.0:6379->6379/tcp
+                             ...                                                          
+nginx-nodejs-redis_web1_1    docker-entrypoint.sh npm       Up      0.0.0.0:81->5000/tcp  
+                             start                                                        
+nginx-nodejs-redis_web2_1    docker-entrypoint.sh npm       Up      0.0.0.0:82->5000/tcp  
+                             start   
+```
+
+## 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
+```
+
+```
+$ curl localhost:80
+web2: Total number of visits is: 4
+``` 
+
+
+## Stop and remove the containers
+
+```
+$ docker-compose down
+```
+

nginx-nodejs-redis/docker-compose.yml

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+version: '3.9'
+services:
+  redis:
+    image: 'redis:alpine'
+    ports:
+      - '6379:6379'
+  web1:
+    restart: on-failure
+    build: ./web1
+    ports:
+      - '81:5000'
+  web2:
+    restart: on-failure
+    build: ./web2
+    ports:
+      - '82:5000'
+  nginx:
+    build: ./nginx
+    ports:
+    - '80:80'
+    depends_on:
+    - web1
+    - web2
+
+

nginx-nodejs-redis/nginx/Dockerfile

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+FROM nginx
+RUN rm /etc/nginx/conf.d/default.conf
+COPY nginx.conf /etc/nginx/conf.d/default.conf

nginx-nodejs-redis/nginx/nginx.conf

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+upstream loadbalancer {
+  server web1:5000;
+  server web2:5000;
+}
+
+server {
+  listen 80;
+  server_name localhost;
+  location / {
+    proxy_pass http://loadbalancer;
+  }
+}

nginx-nodejs-redis/web/Dockerfile

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+FROM node:alpine
+
+WORKDIR /usr/src/app
+
+COPY ./package.json ./
+RUN npm install
+COPY ./server.js ./
+
+CMD ["npm","start"]

nginx-nodejs-redis/web/package.json

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+{
+  "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

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+const express = require('express');
+const redis = require('redis');
+const app = express();
+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('Number of visits is: ' + numVisitsToDisplay);
+        numVisits++;
+        redisClient.set('numVisits', numVisits);
+    });
+});
+
+app.listen(5000, function() {
+    console.log('Web application is listening on port 5000');
+});

nginx-nodejs-redis/web1/Dockerfile

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+FROM node:alpine
+
+WORKDIR /usr/src/app
+
+COPY ./package*.json ./
+RUN npm install
+COPY ./server.js ./
+
+CMD ["npm","start"]

nginx-nodejs-redis/web1/package.json

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+{
+  "name": "web1",
+  "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/web1/server.js

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+const express = require('express');
+const redis = require('redis');
+const app = express();
+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('web1: Total number of visits is: ' + numVisitsToDisplay);
+        numVisits++;
+        redisClient.set('numVisits', numVisits);
+    });
+});
+
+app.listen(5000, function() {
+    console.log('Web app is listening on port 5000');
+});

nginx-nodejs-redis/web2/Dockerfile

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+FROM node:alpine
+
+WORKDIR /usr/src/app
+
+COPY ./package.json ./
+RUN npm install
+COPY ./server.js ./
+
+CMD ["npm","start"]

nginx-nodejs-redis/web2/package.json

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+{
+  "name": "web2",
+  "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/web2/server.js

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+const express = require('express');
+const redis = require('redis');
+const app = express();
+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('web2: Total number of visits is: ' + numVisitsToDisplay);
+        numVisits++;
+        redisClient.set('numVisits', numVisits);
+    });
+});
+
+app.listen(5000, function() {
+    console.log('Web app is listening on port 5000');
+});