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## Compose sample application
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## Node.js application with Nginx proxy and Redis database
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Project structure:
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```
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.
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├── README.md
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├── docker-compose.yml
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├── nginx
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│ ├── Dockerfile
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│ └── nginx.conf
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└── web
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├── Dockerfile
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├── package.json
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└── server.js
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2 directories, 7 files
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```
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[_docker-compose.yml_](docker-compose.yml)
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```
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redis:
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image: 'redislabs/redismod'
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ports:
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- '6379:6379'
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web1:
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restart: on-failure
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build: ./web
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hostname: web1
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ports:
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- '81:5000'
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web2:
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restart: on-failure
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build: ./web
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hostname: web2
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ports:
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- '82:5000'
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nginx:
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build: ./nginx
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ports:
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- '80:80'
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depends_on:
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- web1
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- web2
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```
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The compose file defines an application with four services `redis`, `nginx`, `web1` and `web2`.
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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.
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> ℹ️ **_INFO_**
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> 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.
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## Deploy with docker-compose
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```
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$ docker-compose up -d
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[+] Running 24/24
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⠿ redis Pulled ...
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⠿ 565225d89260 Pull complete
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[+] Building 2.4s (22/25)
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=> [nginx-nodejs-redis_nginx internal] load build definition from Dockerfile ...
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[+] Running 5/5
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⠿ Network nginx-nodejs-redis_default Created
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⠿ Container nginx-nodejs-redis-web2-1 Started
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⠿ Container nginx-nodejs-redis-redis-1 Started
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⠿ Container nginx-nodejs-redis-web1-1 Started
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⠿ Container nginx-nodejs-redis-nginx-1 Started
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```
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## Expected result
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Listing containers must show three containers running and the port mapping as below:
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```
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docker-compose ps
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```
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## Testing the app
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After the application starts, navigate to `http://localhost:80` in your web browser or run:
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```
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curl localhost:80
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curl localhost:80
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web1: Total number of visits is: 1
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```
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```
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curl localhost:80
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web1: Total number of visits is: 2
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```
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```
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$ curl localhost:80
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web2: Total number of visits is: 3
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```
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## Stop and remove the containers
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```
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$ docker-compose down
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```
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