Docker Compose with Predefined network

  If you want to use a predefined network in Docker Compose, you can do so by specifying the network name and driver in your   docker-compos...

 If you want to use a predefined network in Docker Compose, you can do so by specifying the network name and driver in your docker-compose.yml file. Here's an example:

Assuming you already have a Docker network named my-custom-network created, you can define a service in your docker-compose.yml file that uses this network:

version: '3'

services:
  webapp:
    image: nginx:latest
    container_name: webapp-container
    ports:
      - "80:80"
    networks:
      - my-custom-network

  database:
    image: mysql:latest
    container_name: db-container
    environment:
      MYSQL_ROOT_PASSWORD: root_password
    networks:
      - my-custom-network
networks:
  my-custom-network:
    external: true

In this example:

1. We define two services: webapp and database.

2. Both services use the networks directive to specify the my-custom-network network.

Ensure that the my-custom-network is already created before you run the docker-compose command. You can create a custom network using the following command:

docker network create my-custom-network

Once the network is created, you can start the containers using Docker Compose:

docker-compose up -d

This will create and start the webapp-container and db-container containers on the my-custom-network network, allowing them to communicate using the network name.

By using a predefined network, you can share it among multiple Docker Compose projects or containers, allowing for better network isolation and management.