How to use channels and make a site highly available?

[Sergey Pashinin]

Channels recommends using Redis.

I thought I will setup Redis Cluster (https://redis.io/topics/cluster-tutorial) behind HAProxy and it will be all fine.

But Channels does not support working with Redis Cluster - https://github.com/django/channels/issues/485.

Then I was looking at Redis Sentinel - seriously? One more process, a timeout to detect master failure - then make another one a master.. and all that time is downtime? And it's ok if it works correctly at least.

People say different things about RabbitMQ and it's cluster. Personally I am already tired to make it work inside Docker right now (still stops at random times and lost connections and so on)

What is a recommended way to make a site with Django channels work without a downtime? (And without loosing user sessions if 1 node fails)

[Andrew Godwin]

Right now Sentinel is the only Redis way, we have it set to a few seconds' timeout for failover at work I believe. We can't give a magical solution as any zero-downtime solution ends up being very project-specific; you'll need to build on top of Channels to make your own one if you absolutely need that.

Andrew

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