django-redis connection error inside docker

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

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– Elletlar, Commented Nov 18, 2018 at 10:00

Will Keeling · Accepted Answer · 2018-11-19 10:26:48Z

2

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

edited Nov 19, 2018 at 10:26

answered Nov 18, 2018 at 21:58

Will Keeling

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9 Comments

soubhagya Over a year ago

in python what changes i need to do.

Will Keeling Over a year ago

No changes in python. You just need to update your docker-compose.yml and change the REDIS_URI to redis://redis:6379

soubhagya Over a year ago

and do i nee to start redis inside the docker or it will automatically start. just like in local system we need to start redis server before working on it using src/redis-server

Will Keeling Over a year ago

Redis will come up when the container starts. You don't need to enter the container to start it.

soubhagya Over a year ago

rango | redis.exceptions.ConnectionError: Error -2 connecting to redis://redis:6379:6379. Name or service not known. showing error

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