Django channels 2 and EC2 / Elasticbeanstalk - amazon-web-services

Question

My short question, how to setup Django-channels v2 on AWS Elasticbeanstalk? The long and less inviting questions underneath.
Thank you in advance!
I am trying to set up an elasticbeanstalk instance using Django Channels 2.02. I followed this https://hackernoon.com/setting-up-django-channels-on-aws-elastic-beanstalk-716fd5a49c4a tutorial. Tutorial made for Channels 1.
The Elasticbeanstalk instance was created with an application load balancer. The Redis 4.0 instance is running 0.0.0.0:6379, confirmed by netstat. Custom TCP, Port Range: 6379, Source: 0.0.0.0/0 on redis instance.
alb_listener.config in .ebekstension:
option_settings: aws:elbv2:listener:80:
DefaultProcess: http
ListenerEnabled: 'true'
Protocol: HTTP aws:elasticbeanstalk:environment:process:http:
Port: '8000'
Protocol: HTTP
Daphne server startet with command "Daphne .asgi:application". Listening on TCP address 0.0.0.0:8000. It returns:
2018-03-12 08:59:30,778 ERROR Exception inside application: [Errno -2] Name or service not known
File "/opt/python/run/venv/local/lib/python3.6/site-packages/channels/consumer.py", line 54, in __call__
await await_many_dispatch([receive, self.channel_receive], self.dispatch)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/channels/utils.py", line 47, in await_many_dispatch
result = task.result()
File "/opt/python/run/venv/local/lib/python3.6/site-packages/channels_redis/core.py", line 167, in receive
task.result()
File "/opt/python/run/venv/local/lib/python3.6/site-packages/channels_redis/core.py", line 187, in receive_loop
real_channel, message = await self.receive_single(general_channel)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/channels_redis/core.py", line 224, in receive_single
async with self.connection(index) as connection:
File "/opt/python/run/venv/local/lib/python3.6/site-packages/channels_redis/core.py", line 403, in __aenter__
self.conn = await aioredis.create_redis(**self.kwargs)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/aioredis/commands/__init__.py", line 174, in create_redis
loop=loop)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/aioredis/connection.py", line 107, in create_connection
timeout, loop=loop)
File "/usr/lib64/python3.6/asyncio/tasks.py", line 339, in wait_for
return (yield from fut)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/aioredis/stream.py", line 19, in open_connection
lambda: protocol, host, port, **kwds)
File "/usr/lib64/python3.6/asyncio/base_events.py", line 733, in create_connection
infos = f1.result()
File "/usr/lib64/python3.6/concurrent/futures/thread.py", line 55, in run
result = self.fn(*self.args, **self.kwargs)
File "/usr/lib64/python3.6/socket.py", line 743, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
[Errno -2] Name or service not known
The Websocket returns no error in browser console.
It works on my local runserver setup. What is the problem? Can you please help me write a config script so that I don't need to start Daphne manually?

Answer 1

Very late reply here.
The problem is with config:hosts URL in the tutorial. Remove the redis:// portion from the URL.
For instance,
REDIS_PUBLIC_DNS = "YOUR-REDIS-DNS.amazonaws.com"
CHANNEL_LAYERS = {
"default": {
"BACKEND": "channels_redis.core.RedisChannelLayer",
"CONFIG": {
"hosts": [(REDIS_PUBLIC_DNS, 6379)],
}
}
}
You can check the connection using redis-cli,
redis-cli -h REDIS-PUBLIC-DNS-url ping ;you should expect PONG in response.