Not sure why this worked when I changed the hostname from "localhost" to
something custom.
Nevermind I think I am unblocked now.
thanks!
On Thu, May 13, 2021 at 5:09 PM 'Gaurav Poothia' via grpc.io <
grpc-io@googlegroups.com> wrote:
> Hello,
> I am prototyping gRPC client side round robin load balancing.
> So if client wants to dial to "localhost" I want it to load balance
> requests round robin over different loopback addresses e.g. 127.0.0.1,
> 127.0.0.2, 127.0.03 etc
>
> For this experiment I configured unbound (by local DSN) to appropriately
> return multiple A records for "localhost" like so:
>
> $ dig localhost
>
> ; <<>> DiG 9.16.1-Ubuntu <<>> localhost
>
> ;; global options: +cmd
>
> ;; Got answer:
>
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7826
>
> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1
>
>
> ;; OPT PSEUDOSECTION:
>
> ; EDNS: version: 0, flags:; udp: 4096
>
> ;; QUESTION SECTION:
>
> ;localhost. IN A
>
>
> ;; ANSWER SECTION:
>
> localhost. 10800 IN A 127.0.0.1
>
> localhost. 3600 IN A 127.0.0.3
>
> localhost. 3600 IN A 127.0.0.2
>
> ;; Query time: 0 msec
>
> ;; SERVER: 127.0.0.1#53(127.0.0.1)
>
> ;; WHEN: Thu May 13 23:51:33 UTC 2021
>
> ;; MSG SIZE rcvd: 86
>
>
> I modified the hello world client in the grpc quick start guide to use
> round robin LB and
>
> const (
>
> address = "dns:///localhost:50051"
>
> defaultName = "world"
>
> )
>
> func main() {
>
> resolver.SetDefaultScheme("dns")
>
> // Set up a connection to the server.
>
> conn, err := grpc.Dial(address, grpc.WithInsecure(),
> *grpc.WithBalancerName(roundrobin.Name*))
>
> if err != nil {
>
> log.Fatalf("did not connect: %v", err)
>
> }
>
> defer conn.Close()
>
> c := pb.NewGreeterClient(conn)
>
> When I run this I notice that the DNS resolver is returning only 1 IP
> address instead 3 IPs hence there is nothing to load balance
>
> INFO: 2021/05/14 00:04:01 [core] parsed scheme: "dns"
>
> INFO: 2021/05/14 00:04:01 [core] ccResolverWrapper: sending update to cc:
> {[{127.0.0.2:50051 <nil> 0 <nil>}] <nil> <nil>}
>
> *INFO: 2021/05/14 00:04:01 [balancer] base.baseBalancer: got new
> ClientConn state: {{[{127.0.0.2:50051 <http://127.0.0.2:50051> <nil> 0
> <nil>}] <nil> <nil>} <nil>}*
>
> INFO: 2021/05/14 00:04:01 [core] Subchannel Connectivity change to
> CONNECTING
>
> INFO: 2021/05/14 00:04:01 [balancer] base.baseBalancer: handle SubConn
> state change: 0xc000119d10, CONNECTING
>
> INFO: 2021/05/14 00:04:01 [core] Subchannel picks a new address "
> 127.0.0.2:50051" to connect
>
> INFO: 2021/05/14 00:04:01 [core] Channel Connectivity change to CONNECTING
>
> INFO: 2021/05/14 00:04:01 [core] Subchannel Connectivity change to READY
>
> INFO: 2021/05/14 00:04:01 [balancer] base.baseBalancer: handle SubConn
> state change: 0xc000119d10, READY
>
> INFO: 2021/05/14 00:04:01 [roundrobin] roundrobinPicker: newPicker called
> with info: {map[0xc000119d10:{{127.0.0.2:50051 <nil> 0 <nil>}}]}
>
> INFO: 2021/05/14 00:04:01 [core] Channel Connectivity change to READY
>
>
> Any pointers on why dig(or nslookup) and the gRPC DNS resolver would
> return different number of IPs for the same name?
>
>
> Thanks in advance!
>
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