[Python] Count redis queue length in docker

I have a Celery+Redis python application.

I have to find number of tasks in queue. I trying this command, but the output is zero. I am confident that queue is not empty.

redis-cli -n 1 -h localhost -p 6379 llen celery

(integer) 0


I think I am using invalid arguments. My redis + celery configuration:

celery:
build: ./project
command: celery -A core_app worker --loglevel=info --concurrency=15 --max-memory-per-child=1000000
volumes:
- ./project:/usr/src/app
- ./project/media:/project/media
- ./project/logs:/project/logs
env_file:
- .env
environment:
# environment variables declared in the environment section override env_file
- DJANGO_ALLOWED_HOSTS=localhost 127.0.0.1 [::1]
- CELERY_BROKER=redis://redis:6379/0
- CELERY_BACKEND=redis://redis:6379/0
depends_on:
- django
- redis

redis:
build:
context: ./redis_customization
dockerfile: Dockerfile
image: redis:7.2-alpine
restart: always
ports:
- 6379:6379
# Run the init script
command: sh -c "./init.sh"
# Run as privileged to allow the container to change the vm.overcommit_memory setting
privileged: true

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