Envoy "look-aside" load balancing?

[Jia Zhan]

Hello,

We have a couple of use cases where we would need to use a custom "load balancing" strategy that Envoy provides, e.g. 

1. "routing override" based on request metadata, .e.g. use Envoy as a pass-through proxy which forwards the request based on the destination host:port information attached in the request metadata (e.g. header), bypassing all the XDS & LB logic. 

2. More generally, a way to do "look-aside" load balancing (via a filter? an external service?) that allow us to customize the load balancing logic without having to modify the core Envoy LB logic. (Sorry for being a little vague on the requirements here, but we'd like to see what flexibilities we have when implementing a customized LB logic in Envoy)

Any pointers are appreciated! Thanks

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jz

[Raul Gutierrez Segales]

Hi,

We blogged about this:

https://medium.com/pinterest-engineering/simplifying-web-deploys-19244fe13737

Ping me on Slack if you want to chat about it.

Cheers,
-rgs

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[Matt Klein]

See also https://github.com/envoyproxy/envoy/issues/5598 which tracks adding load balancer extensibility.

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