Docker Django, redis and celery conf - django

Question

I dont know what part I am missing but celery not conneting to redis when I am running docker-compose up --build
error: Cannot connect to redis://127.0.0.1:6379/0: Error 111 connecting to 127.0.0.1:
6379. Connection refused.
Here is my file docker-compose.yml
version: '3'
services:
web:
build: .
image: resolution
depends_on:
- db
- redis
- celery
command: bash -c "python3 /code/manage.py migrate && python3 /code/manage.py initialsetup && python3 /code/manage.py runserver 0.0.0.0:8000"
volumes:
- .:/code
ports:
- "8000:8000"
links:
- db:db
- redis:redis
- celery:celery
restart: always
environment:
- POSTGRES_DB=postgres
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=postgres
- PGHOST=trust
- PGPORT=5432
db:
image: postgres:latest
environment:
POSTGRES_DB: 'postgres'
POSTGRES_PASSWORD: 'postgres'
POSTGRES_USER: 'postgres'
POSTGRES_HOST: 'trust'
redis:
image: "redis:alpine"
ports:
- "6379:6379"
restart: on-failure
celery:
image: resolution
command: celery -A mayan worker -l info
environment:
- DJANGO_SETTINGS_MODULE=mayan.settings.production
volumes:
- .:/code
depends_on:
- db
- redis
links:
- redis:redis
restart: on-failure

Answer 1

celery and redis are running in different containers.
According to the error message that you shared, most likely, your celery is trying to connect to localhost to reach the RedisDB, which is not on localhost.
Seach for the celery configuration file that contains the CELERY_BROKER_URL and CELERY_RESULT_BACKEND values. Most likely they look like this:
CELERY_BROKER_URL = 'redis://localhost:6379'
CELERY_RESULT_BACKEND = 'redis://localhost:6379'
They should look like this, pointing to the redis service name that you defined in your compose file:
CELERY_BROKER_URL = 'redis://redis:6379'
CELERY_RESULT_BACKEND = 'redis://redis:6379'
If you don't have such a config, search directly for the place where the Celery instance is initialized and make sure it looks like this:
app = Celery('server', broker='redis://redis:6379/0')