/envoy-xds

Primary LanguageGo

Envoy xDS demo

xDS is the control plane protocol of Envoy. An Envoy instance can be configured to contact an xDS endpoint for additional config (see envoy-data/bootstrap-xdsv3.yaml).

Via xDS these 5 root level configuration types can be configured:

  1. endpoints (implement only this for just an Endpoint Discovery Service (EDS))
  2. clusters
  3. routes
  4. listeners
  5. runtimes

This repository shows:

  • how to run a custom xDS control-plane; uses go-control-plane example.
  • how to run a EDS discovery service; uses go-control-plane dyplomat example.
  • how to add metadata via web assembly.
  • how to add metadata via a gRPC call.
  • how to dynamically select cluster endpoints based on some kind of metadata.

References

  1. https://github.com/envoyproxy/go-control-plane/tree/master/internal/example/
  2. https://github.com/envoyproxy/go-control-plane/tree/master/examples/dyplomat/
  3. https://docs.solo.io/gloo/latest/guides/dev/writing-upstream-plugins/
  4. WebAssembly Gloo
  5. https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/upstream/load_balancing/subsets