docker-compose creating multiple set of services

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?

I think you should 3 different files as docker-compose itself is a binary which works under the hood with Docker engine to create 3 different set of mattermost services. Also it is better for the sake of maintainability. — Janshair Khan, Jul 09 '18 at 05:09
See if this is of any help https://tarunlalwani.com/post/docker-compose-scale-with-dynamic-configuration-part-1/ ? — Tarun Lalwani, Jul 09 '18 at 05:47

score 0 · Answer 1 · answered Jul 09 '18 at 07:25

0

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.

answered Jul 09 '18 at 07:25

Alejandro Galera

3,445
3
24
42

But how can I create 3 different names for the 3 databases? – Brian Jul 09 '18 at 07:30
Why do you need that? You can create the same database name. Each container is independent from others. – Alejandro Galera Jul 09 '18 at 07:31

score 0 · Answer 2 · answered Jul 10 '18 at 02:44

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

Hi, thank you for your help. But it looks like that mattermost doesn't support changing `app` port by configuring `docker-compose.yml`. Maybe I have to dive deeper to modify the files under `app` folder. — Brian, Jul 11 '18 at 02:40

docker-compose creating multiple set of services

2 Answers2