How to Call a Service Running in a Docker Container from Another Docker Container on the Same Machine?

Thank you for the detailed answer.

Your solution helped me.

Thank you!

You can set up communication between your containers without exposing the Redis port to localhost by using Docker's internal network. To do this, add a cronjob container to the same docker-compose.yml and use the Redis service name for the connection.

Example docker-compose.yml with cronjob:

		

			
				
			
		
		version: '3.8'

services:
  redis_service:
    image: "redis:alpine"
    container_name: rediscontainer
    expose:
      - "6380"
  worker_instances:
    image: custom/worker-app
    container_name: workerapp
    depends_on:
      - redis_service
    deploy:
      replicas: 5
  scheduled_task:
    image: custom/cronjob-app
    container_name: cronjobapp
    environment:
      - REDIS_URL=http://rediscontainer:6380
    entrypoint: ["./run_task.sh"]
    restart: "no"
    networks:
      - default
networks:
  default:
    driver: bridge
	

In this example:
scheduled_task — new service for the cronjob.
REDIS_URL — environment variable pointing to the Redis service within the Docker network.
entrypoint — command to run the task script.
Containers are on the same Docker network (default), allowing them to communicate via service names.

Add a cronjob container to the same docker-compose.yml and use the Redis service name for internal connection, avoiding exposing ports externally.