## Node.js application with Nginx proxy and a 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
```