How can I set up multi-host networking with Docker Compose?

How can I set up multi-host networking with Docker Compose?

To set up multi-host networking with Docker Compose, you can use Docker Swarm or overlay networks. Would you like a step-by-step guide?

Yes, please provide the steps for using Docker Swarm.

First, initialize Docker Swarm on your manager node using docker swarm init. Then, join worker nodes using the command provided by the manager. After that, create an overlay network with docker network create -d overlay my_overlay.

What about the Docker Compose file? How should it look?

Your Docker Compose file should define services and specify the overlay network. Here's a basic example:

version: '3'
services:
  web:
    image: nginx
    networks:
      - my_overlay
networks:
  my_overlay:
    external: true

Can I scale services across multiple hosts?

Yes, you can scale services by using the --scale option in your docker-compose up command, like this: docker-compose up --scale web=5.