This repository

This repository present examples on how to work with gRPC load balancing.

Best links available online about gRPC load balancing are:

• https://grpc.io/blog/grpc-load-balancing/
• https://github.com/grpc/grpc/blob/master/doc/load-balancing.md
• https://www.youtube.com/watch?v=F2znfxn_5Hg

Scenarios covered by this repository are:

• round robin for gRPC C# client README
• lookaside load balancing for gRPC C# client README
• round robin for gRPC dotnet client README
• lookaside load balancing for gRPC dotnet cient README
• lookaside load balancing for gRPC dotnet cient with custom dns server (CoreDNS) README
• lookaside load balancing for gRPC dotnet in asp.net core README
• sidecar load (static config) balancing for gRPC dotnet README
• sidecar load (dynamic config) balancing for gRPC dotnet README
• istio service mesh load balancing for gRPC dotnet README
• xDS balancing for gRPC dotnet README
• lookaside load balancing for gRPC Java client README
• lookaside load balancing for gRPC Go client README
• lookaside load balancing for gRPC Python client README

Repository also contains simple load balancer for gRPC in K8s written in C#

Getting started

1. Download repository
2. Download .Net SDK (in the moment of writing 3.1.101)
3. Initialize git submodule(s) (see more https://stackoverflow.com/questions/44366417/what-is-the-point-of-git-submodule-init)
4. Open README.md file for scenario of choice
5. Setup K8s cluster
6. Create pods/services/deployments as described in README.md

Sources

• https://grpc.io/blog/loadbalancing/
• https://github.com/grpc/grpc/blob/master/doc/load-balancing.md
• https://docs.microsoft.com/en-us/dotnet/architecture/grpc-for-wcf-developers/load-balancing
• https://github.com/grpc/grpc/blob/master/doc/load-balancing.md
• https://grpc.io/blog/grpc-load-balancing/
• https://github.com/jtattermusch/grpc-loadbalancing-kubernetes-examples/blob/master/grpc_loadbalancing_kubernetes_slides.pdf
• https://github.com/jtattermusch/grpc-loadbalancing-kubernetes-examples
• https://tools.ietf.org/html/rfc2782 - describe SRV records in DNS
• https://github.com/grpc/grpc/blob/master/doc/environment_variables.md
• https://kubernetes.io/blog/2018/11/07/grpc-load-balancing-on-kubernetes-without-tears/
• https://github.com/grpc/grpc/issues/19401
• https://github.com/grpc/grpc/pull/17723
• https://github.com/grpc/grpc/blob/master/doc/naming.md
• https://github.com/grpc/proposal/blob/master/A5-grpclb-in-dns.md
• https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/
• https://kubernetes.io/docs/tasks/administer-cluster/dns-debugging-resolution/
• https://serverfault.com/questions/99483/nslookup-for-srv-records-or-any-non-a-records-in-non-interactive-mode
• https://github.com/grpc/grpc/blob/master/src/core/ext/filters/client_channel/resolver/dns/c_ares/dns_resolver_ares.cc
• https://github.com/grpc/grpc/blob/master/src/csharp/Grpc.Core/ChannelOptions.cs
• https://github.com/grpc/grpc/blob/master/include/grpc/impl/codegen/grpc_types.h
• https://github.com/grpc/grpc-dotnet/issues/521