Django Channels Error - Cannot import BACKEND 'asgi_redis.RedisChannelLayer'

Question

I have installed Django-Channels but while running the daphne-server I am getting this error given below:

File "/usr/local/lib/python2.7/dist-packages/channels/asgi.py", line 36, in make_backend
"Cannot import BACKEND %r specified for %s" % (self.configs[name]['BACKEND'], name)

channels.asgi.InvalidChannelLayerError: Cannot import BACKEND 'asgi_redis.RedisChannelLayer' specified for default

My settings.py is:

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

Need help in resolving this error.

score 27 · Answer 1 · edited Jun 06 '21 at 19:55

27

In regard to Utkarsh's reply itt's been renamed to:

pip install channels-redis

edited Jun 06 '21 at 19:55

Ali Husham

816
10
31

answered Nov 30 '18 at 13:57

drulang

434
1
4
5

Thanks for pointing it out @drulang. For anyone trying to install Django Channels 2, the documentation describes the changes that have taken place here - https://channels.readthedocs.io/en/latest/one-to-two.html#channel-layers – Utkarsh Sinha Dec 01 '18 at 02:03

score 13 · Accepted Answer · answered May 20 '16 at 12:05

13

Just needed to install 'asgi_redis'. I was assuming that it would have gotten installed by default while installing Django-Channels, but it doesn't. 'asgiref' gets installed by default and not 'asgi_redis'. So to solve this issue, one can just run:

> sudo pip install asgi_redis

answered May 20 '16 at 12:05

Utkarsh Sinha

941
2
11
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2

I found this to be also true for "Cannot import BACKEND 'channels_redis.core.RedisChannelLayer'": pip install channels_redis. Thank you. – user42488 May 16 '18 at 13:55
2

With asgiref-2.3.2 i need to install channel_redis. NOT asgi_redis – jlSta Sep 25 '18 at 05:33
3

@jlSta, great, this solved one of the issues with new channels 2.x, wish it was written in the docs (and, it's channels_redis) – Mike Spike Oct 20 '18 at 15:30
I add this as a solution, so – jlSta Oct 30 '18 at 09:51

score 7 · Answer 3 · answered Apr 05 '19 at 06:54

I also faced same problem while working with django-channels, by following the documentation examples https://channels.readthedocs.io/en/latest/tutorial/index.html you just need to install channels-redis as

pip install channels-redis

to resolve this issue.

score 6 · Answer 4 · answered Oct 30 '18 at 09:53

6

With asgiref-2.3.2 and maybe more, you need to install channel_redis.

NOT asgi_redis.

pip install channel_redis

answered Oct 30 '18 at 09:53

jlSta

294
3
12

Yes! Use this for channels. I am using channels 2.1.5. e.g. `pip install channels==2.1.5` (This version also installs `asgiref==2.3.2`) – rprasad Nov 06 '18 at 16:32
3

I think it should be channels_redis – fanny Sep 18 '19 at 13:35

score 3 · Answer 5 · answered May 07 '20 at 02:35

Faced the similar issue. Solved it by installing channels_redis:

pip install channels_redis

Also using channel redis in setting too:

CHANNEL_LAYERS = {
    'default': {
        'BACKEND': 'channels_redis.core.RedisChannelLayer',
        'CONFIG': {
            'hosts': [('localhost', 6379)],
        },
    },
    'ROUTING': 'ws.routing.application',
}

score 1 · Answer 6 · answered Feb 09 '22 at 16:07

1

That did the thing for me.

daphne = "~=3.0.2"
channels = "~=3.0.4"
channels-redis = "~=3.3.1"
async-timeout = "~=3.0.1"

answered Feb 09 '22 at 16:07

Serafim Suhenky

2,140
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15
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score 0 · Answer 7 · answered Oct 22 '18 at 03:39

0

In my case asgiref version 2.3.2 was not compatible. I downgraded it as follows and then my code worked.

pip install asgiref==1.0.0

answered Oct 22 '18 at 03:39

Jayati Deshmukh

59
1
3

See comment from jlSta above, e.g. `pip install channel_redis` – rprasad Nov 06 '18 at 16:35

score 0 · Answer 8 · answered Nov 02 '22 at 23:22

I know this is an old post, however, I got the same problem and I got the solution from this link:

https://github.com/django/channels_redis/issues/113#issuecomment-405071710

based on Andrewgodwin he says:

"asgi-redis is an outdated package (the previous version of channels_redis). You can uninstall it to solve this error."

and that worked for me

Django Channels Error - Cannot import BACKEND 'asgi_redis.RedisChannelLayer'

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