I am using Rails 6 with sidekiq and redis:

The Redis container starts, but the Sidekiq container does not start:
My Docker configuration is as:

version: '3'

services:
  redis:
    image: redis:alpine
    container_name: redis
    command: redis-server --bind 0.0.0.0
    ports:
      - "6379:6379"
    networks:
      appnet:
        aliases:
          - redis
    healthcheck:       # Crucial for AWS/Sidekiq stability
      test: ["CMD", "redis-cli", "ping"]
      interval: 5s
      timeout: 3s
      retries: 5

  opal_web:
    build: .
    container_name: opal_web
    command: >
      bash -c "
              until nc -z redis 6379; do
                echo 'Waiting for redis...'
                sleep 1
              done;
              rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'
            "
    volumes:
      - .:/app
    ports:
      - "3000:3000"
    depends_on:
      redis:
        condition: service_healthy
    extra_hosts:
      - "host.docker.internal:host-gateway"
    environment:
      REDIS_URL: redis://redis:6379/0
      DATABASE_HOST: host.docker.internal
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: postgres
      POSTGRES_DB: opal_04_09_2025
    networks:
      - appnet

  opal_sidekiq:
    build: .
    container_name: opal_sidekiq
    command: >
      bash -c "
              until nc -z redis 6379; do
                echo 'Waiting for redis...'
                sleep 1
              done;
              bundle exec sidekiq -C config/sidekiq.yml
            "
    volumes:
      - .:/app
    depends_on:
      redis:
        condition: service_healthy
    extra_hosts:
      - "host.docker.internal:host-gateway"
    environment:
      REDIS_URL: redis://redis:6379/0
      DATABASE_HOST: host.docker.internal
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: postgres
      POSTGRES_DB: opal_04_09_2025
    networks:
      - appnet

networks:
  appnet:
    driver: bridge

The containers are communicating with each other fine when starting the docker container in local host machine.

But when deploying to ECS after uploading the images, it's giving the following error:

Redis::CannotConnectError at /

Error connecting to Redis on redis:6379 (SocketError)