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

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* Added Node, Nginx and Redis Project
* Added Flask/Redis
This commit is contained in:
Ajeet Singh Raina, Docker Captain, ARM Innovator, RedisInc 2022-03-17 22:03:36 +05:30 committed by GitHub
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5
README.md
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@ -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 / 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 - [`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. 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 - [`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.
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 / 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. - [`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 - [`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 - [`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. 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 - [`React / Express / MySQL`](https://github.com/docker/awesome-compose/tree/master/react-express-mysql) - Sample React

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flask-redis/Dockerfile Normal file
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@ -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

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flask-redis/README.md Normal file
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@ -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
```

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flask-redis/app.py Normal file
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@ -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)

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

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flask-redis/requirements.txt Normal file
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@ -0,0 +1,2 @@
flask
redis

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nginx-nodejs-redis/README.md Normal file
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@ -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
```

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nginx-nodejs-redis/docker-compose.yml Normal file
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@ -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

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nginx-nodejs-redis/nginx/Dockerfile Normal file
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@ -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

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nginx-nodejs-redis/nginx/nginx.conf Normal file
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@ -0,0 +1,12 @@
upstream loadbalancer {
server web1:5000;
server web2:5000;
}
server {
listen 80;
server_name localhost;
location / {
proxy_pass http://loadbalancer;
}
}

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nginx-nodejs-redis/web/.gitignore vendored Normal file
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@ -0,0 +1 @@
node_modules

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nginx-nodejs-redis/web/Dockerfile Normal file
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@ -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"]

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nginx-nodejs-redis/web/package-lock.json generated Normal file
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@ -0,0 +1,408 @@
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}

15
nginx-nodejs-redis/web/package.json Normal file
View File

@ -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"
}

24
nginx-nodejs-redis/web/server.js Normal file
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@ -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');
});