Error 111 connecting to localhost:6379. Connection refused. Django Heroku

Question

I am able to run redis locally and everything works.

However when I deploy to heroku I get this error:

Error 111 connecting to localhost:6379. Conn         


        

Answer 1

if anyone comes here trying to get django_rq to work after encountering either 99 or 111 errors try the following:

RQ_QUEUES = {
"default": {
    "HOST": "redis",
    "PORT": "6379",
    "URL": os.getenv("REDISTOGO_URL", "redis://redis:6379"),  # If you're
    "DB": 0,
    "DEFAULT_TIMEOUT": 480,
  }
}

this requires you to name the redis container like this in your docker-compose.yml

services:
  app:
    build:
      context: .
    ports:
      - "8000:8000"
    volumes:
      - ./app:/app
    command: >
      sh -c   "python manage.py makemigrations && 
              python manage.py migrate && 
              python manage.py runserver 0.0.0.0:8000"
    depends_on:
      - redis
  redis:
    image: redis:6-alpine
    ports:
      - "6379:6379"

Answer 2

This could happen when whatever application that is calling/connecting to redis, the environment variable it consumed in order to specify a connection hasn't been properly set - REDISCLOUD_URL or REDISTOGO_URL etc. This could most easily be that redis was started after the app or redis restarted and cycled its connection IP and/or access. So, upon deploying, insure redis is started prior to the downstream app(s)

Insure redis is up and running and a simple reboot on the app could fix the issue OR, as other answers have indicated, refresh the app in the appropriate manner to re-fresh & re-consume the environment variable.

Answer 3

Error 111 is thrown when the application is unable to contact Redis. I had the same problem following the Heroku Django Channels tutorial. The settings.py file should read:

CHANNEL_LAYERS = {
    "default": {
        "BACKEND": "asgi_redis.RedisChannelLayer",
        "CONFIG": {
            "hosts": [os.environ.get('REDISCLOUD_URL', 'redis://localhost:6379')],
        },
        "ROUTING": "chat.routing.channel_routing",
    },
}

REDISCLOUD_URL instead of REDIS_URL.

Ensure Redis is installed on the Heroku server.

Answer 4

Turns out I needed to set up things like this for it to work on Heroku.

redis_url = os.getenv('REDISTOGO_URL')

urlparse.uses_netloc.append('redis')
url = urlparse.urlparse(redis_url)
conn = Redis(host=url.hostname, port=url.port, db=0, password=url.password)

Answer 5

I was facing same the error

• Maybe radis server was not installed in your environment

  sudo apt-get install redis-server

• I needed to set up things like this in settings.py

  redis_host = os.environ.get('REDIS_HOST', 'localhost')    
  # Channel layer definitions
  # http://channels.readthedocs.org/en/latest/deploying.html#setting-up-a-channel-backend
  CHANNEL_LAYERS = {
      "default": {
          # This example app uses the Redis channel layer implementation asgi_redis
          "BACKEND": "asgi_redis.RedisChannelLayer",
          "CONFIG": {
              "hosts": [(redis_host, 6379)],
          },
          "ROUTING": "multichat.routing.channel_routing",
      },
  }
  

• Before

• After

Answer 6

Right now Heroku automatically sets the environment variable REDIS_URL to URL + port.

A convenient way to work with redis on heroku is to use a connection pool:

settings.py

import redis
REDIS_DEFAULT_CONNECTION_POOL = redis.ConnectionPool.from_url(os.getenv('REDIS_URL', 'redis://localhost:6379/'))

whererver.py

from redis import Redis
from myProject.settings import REDIS_DEFAULT_CONNECTION_POOL

redis = Redis(connection_pool=REDIS_DEFAULT_CONNECTION_POOL)
print(redis.keys())  # works