"Could not contact DNS servers" even setting GRPC_DNS_RESOLVER=native

[belanke...@gmail.com]

I have cross-compiled the code successfully for QNX ARM 7.0, and able to generate the binaries.

Very first thing I am going to do is to run the helloworld code on the target. So I built the helloworld code available in cpp folder(since I am using cpp). 

I copied only two files greeter_server and greeter_client in target machine. I am able to start server using greeter_server successfully. But when I run greeter_client in another window, I get failure message.

14: DNS resolution failed
Greeter received: RPC failed

Here is the logs after enabling GRPC_TRACE=ALL, GRPC_VERBOSITY=DEBUG.

Please help me know the issue.

We do not have DNS server, I tried using GRPC_DNS_RESOLVER=native, but did not helped. 

Do we need DNS? If its not DNS then, what is it failing?

Thank you in advance.

-Darshan  Belanke

[Srini Polavarapu]

DNS is the default name resolver in gRPC. gRPC C++ uses C-Ares as default library to resolve DNS unless you set GRPC_DNS_RESOLVER=native. Check that you have valid nameserver in /etc/resolv.conf.  It is strange that GRPC_DNS_RESOLVER=native did not help which should just use the system nameresolver. What was the error in that case? Does replacing localhost with 127.0.0.1 in the channel help?

[belanke...@gmail.com]

Thanks for reply @Srini. 

Yes I resolved this issue by replacing the 127.0.0.1 with localhost.