Docker Django, redis and celery conf

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

Neo Anderson · Accepted Answer · 2020-08-08 20:54:46Z

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')

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