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

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

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"

I also landed here with the following problem.

Trying again in 2.00 seconds...

[2019-06-10 07:25:48,432: ERROR/MainProcess] consumer: Cannot connect to redis://localhost:6379//: Error 111 connecting to localhost:6379. Connection refused..
Trying again in 4.00 seconds...

[2019-06-10 07:25:52,439: ERROR/MainProcess] consumer: Cannot connect to redis://localhost:6379//: Error 111 connecting to localhost:6379. Connection refused..
Trying again in 6.00 seconds...

[2019-06-10 07:25:58,447: ERROR/MainProcess] consumer: Cannot connect to redis://localhost:6379//: Error 111 connecting to localhost:6379. Connection refused..
Trying again in 8.00 seconds...

I realized the problem was the ufw which was denying the connections. Therefore, I allowed connections at this port using the following command.

sudo ufw allow 6379

This will set up a new rule in Ubuntu's firewall that will allow connection from port 6397.

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.

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

for me, I noticed that the port number was wrong, so I simply fixed it.

    app = Celery("tasks", broker="redis://localhost:6379")

In my case I fixed this by

sudo yum install redis
sudo service redis start

I tried the following redis LOCATION URL and it worked

# caches
CACHES = {
    "default": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": "redis://redis:6379",
        "OPTIONS": {
            "CLIENT_CLASS": "django_redis.client.DefaultClient"
        },
        "KEY_PREFIX": "example"
    }
}