Statically configure a microservice to run on a specific machine

I created a 4 micro-services using the Moleculer framework with docker-compose. How do I statically configure each micro-service to run on a specific machine.

You may want to use docker swarm which has a feature allows you to deploy a container on a specific node which called Constraints

Node: A docker node refers to a member in a swarm mode cluster. Every swarm node must be a docker host, Source: What is the difference between docker host and node?

Constraints can be treated as node tags, They are key/value pairs associated to particular node.

Each node by default has the following constraints:

• node.id
• node.hostname
• node.role

A service can be deployed as the following:

docker service create --name backendapp --constraint 'node.hostname == web.example.com'

Note that you can deploy to swarm using docker-compose.yml:

The deploy command supports compose file version 3.0 and above.

docker stack deploy --compose-file docker-compose.yml mystack

Also you can set constraints in docker-compose similar to the following example:

version: '3.3'
services:
  web:
    image: backendapp-image
    deploy:
      placement:
        constraints:
          - node.hostname == web.example.com

You can get start with docker swarm through here