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mittwald / kube-httpcache

Varnish Reverse Proxy on Kubernetes
MIT License
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Does the chart Support for horizontal scaling without need for caching repetitively on each Varnish replica's #246

Closed Manikkumar1988 closed 2 months ago

Manikkumar1988 commented 2 months ago

Hi,

Currently is it possible to scale varnish horizontally(sharing same volume) for a single backend via -backend-service=backend-service that can have multiple replicas.

So dont need to cache the same content which is available already on another replica of Varnish

Request -->  [ Varnish ]  -->
                                                 ---> [ Backend Service A]
                                                 [Backend Service A POD 1]
                                                 [Backend Service A POD 2]

Or intention is to have only one replica of varnish for multiple replicas of the backend pod?

martin-helmich commented 2 months ago

I believe having multiple Varnish instances sharing the same storage backend is not officially supported.^1

dont need to cache the same content which is available already on another replica of Varnish

For this scenario, I'd like to point you to the "Creating a self-routing Varnish cluster" guide from the official documentation. That deployment scenario can be implemented using this chart with the appropriate VCL configuration.

Manikkumar1988 commented 1 month ago

Signaller is trying to purge by fire and forget approach! Is there a way we can achieve the strong consistency for that?