Project structure:
tree
.
├── LICENSE
├── README.md
├── compose.yml
├── nginx
│ ├── Dockerfile
│ └── nginx.conf
└── web
├── Dockerfile
├── package-lock.json
├── package.json
└── server.js
3 directories, 9 files
services:
redis:
image: redis
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.
$ 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
Listing containers must show three containers running and the port mapping as below:
docker compose ps
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
$ docker compose down
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