django-redis connection error inside docker - django

Question

django views.py
import redis
import jwt
from access import utils
import os
redis_url = os.environ['REDIS_URI']
R = redis.StrictRedis(redis_url)
def set(request):
R.set('foo', 'bar')
return JsonResponse({"code":200,"msg":"success"})
docker-compose
version: "3"
services:
rango:
container_name: rango
build: ./
command: python backend/manage.py runserver 0.0.0.0:8000
# command: npm start --prefix frontend/rango-frontend/
working_dir: /usr/src/rango
environment:
REDIS_URI: redis://redis_db:6379
ports:
- "8000:8000"
tty: true
links:
- elasticsearch
- node
- redis
#elastic search
elasticsearch:
image: docker.elastic.co/elasticsearch/elasticsearch:6.5.0
ports:
- "9200:9200"
#node
node:
image: node:10.13.0
#redis
redis:
image: redis
environment:
- ALLOW_EMPTY_PASSWORD=yes
ports:
- "6379:6379"
here i am connecting redis from django inside docker.
it is giving me exceptions connexctions refused.
Please have a look into my code and shared screenshot below

Answer 1

By default, docker compose makes containers discoverable with a hostname identical to the container name. Your redis container is thus discoverable via the hostname redis. However, your Django container is using the hostname redis_db.
Update your docker-compose.yml and change the REDIS_URI to reference the correct hostname:
REDIS_URI: redis://redis:6379