docker-compose creating multiple set of services - docker

Question

I'm trying to create 3 mattermost services on 1 AWS EC2 machine.
Let me explain further with more texts:
When I run docker-compose up -d, I get a service whose structure is like this:
How can I modify the docker related scripts so that I can create 3 sets of service?
I've tried docker-compose up --scale app=3 --scale web=3 --scale db=3. But I can't find any way to specify different port for each of the App container.
The only solution I've found is:
Create 3 copies of mattermost-docker folder.
Change the App port and database connection information.
Run docker-compose up -d 3 times in mattermost-docker1, mattermost-docker2, and mattermost-docker3 separately.
But this solution creates a lot of duplicated files. I don't like it.
Anyone knows how to create 3 sets of mattermost services?

Answer 1

You need to specify a port range in docker compose:
For example, for 10 container scalling:
version: '3'
services:
web:
...
ports:
- "80-90:443"
app:
...
ports:
- "8000-8010"
Note that you don't need to change port inside container (443, 444, 445). You can use the same, and furthermore that's recommended, because although you use different containers in a port range, is easier if they use the same nginx configuration.

Answer 2

This starts sets of services using 3 separate databases (nginx and mongo used as example).
version: '3'
services:
web1:
container_name: web1
image: nginx:latest
ports:
- 8080:8080
app1:
container_name: app1
image: nginx:latest
ports:
- "8081:8081"
db1:
container_name: db1
image: mongo
ports:
- 27017
web2:
container_name: web2
image: nginx:latest
ports:
- 8082:8082
app2:
container_name: app2
image: nginx:latest
ports:
- "8083:8083"
db2:
container_name: db2
image: mongo
ports:
- 27018
web3:
container_name: web3
image: nginx:latest
ports:
- 8084:8084
app3:
container_name: app3
image: nginx:latest
ports:
- "8085:8085"
db3:
container_name: db3
image: mongo
ports:
- 27019
Local Test:
NAMES STATUS PORTS IMAGE
db2 Up About a minute 27017/tcp, 0.0.0.0:32803->27018/tcp mongo
web1 Up About a minute 80/tcp, 0.0.0.0:32802->8080/tcp nginx:latest
db1 Up About a minute 0.0.0.0:32801->27017/tcp mongo
app1 Up About a minute 80/tcp, 0.0.0.0:32800->8081/tcp nginx:latest
app3 Up About a minute 80/tcp, 0.0.0.0:32798->8085/tcp nginx:latest
db3 Up About a minute 27017/tcp, 0.0.0.0:32799->27019/tcp mongo
app2 Up About a minute 80/tcp, 0.0.0.0:32797->8083/tcp nginx:latest
web3 Up About a minute 80/tcp, 0.0.0.0:32796->8084/tcp nginx:latest
web2 Up About a minute 80/tcp, 0.0.0.0:32795->8082/tcp nginx:latest