Dns resolution failed grpc docker. 0 What operating system (Linux, Windows,.

Dns resolution failed grpc docker company port 443 after 2 ms: Could not connect to server Since I can always reach my REST service when the request originates from “outside the Docker network” for me it seems to be a problem with the DNS resolution within the Docker network. Connecting directly to the IP address of the service works fine. local:4000. 0 What operating system (Linux, Windows,) and version? Windows 10 Version 1809 What runtime / compiler are you using (e. Resolvers should be able to contact the authority and get a resolution that they return back to the gRPC client library. 1 on Mac Jul 15, 2021 · After a period of trying, I found it's related to the gRPC C-Ares issues. I then launched the apollo server client and received the following error message: "14 UNAVAILABLE: Name resolution failed for target DNS: http://0. If you want netbios lookups then use the native resolver. my. The usercode server is running on port 4000, and the webserver is trying to reach it on dagster-usercode. However I think this is not a gRPC problem - it is a problem in a badly configured environment. More detailed information about how gRPC interprets channel target names can be found in this documentation page. To fix the environment for c-ares: add the host information to the DNS server or add Mar 15, 2017 · I have a gRPC application running on a kubernetes cluster exposed using a headless service. Sep 18, 2022 · I have a grpc service and a simple http server serving as a grpc client. net core client to connect to the server. conf on the host machine. In this post, you’ll learn why DNS resolution fails inside containers and How To Fix DNS Resolution Issues Inside Docker with real examples. I am using . It works perfectly fine when GRPC server is not running as a docker container. Second thing to check is run cat /etc/resolv. It does not do netbios lookups. 0:40000 ". 4 and I am experiencing a very weird problem with the my grpc service and I cant access it. They work fine when running locally. Nothing is working, except my own written client which is connecting and calling server without any issues. NET 5 and I’m using the latest versions of the gRPC packages. Apr 27, 2020 · Chirpstack-docker sets up a couple of containers that talk to each other over the network. I've tried localhost:50053, 127. 20. Docker basically The gRPC library does not recognize the https:// scheme for addresses, so that target name will cause it to try to resolve the wrong name. x, then the container will not be able to resolve the domain names into ip addresses, so ping google. 0, gRPC DNS resolution fails with this error: DNS resolution failed for <address>: C-ares status is not ARES_SUCCESS qtype=A name=<domain> is_balancer=0: Could not contact DNS servers: . Jan 8, 2017 · The gRPC client library will use the specified scheme to pick the right resolver plugin and pass it the fully qualified name string. x. 4" command: - --api. com or your private APIs — even though they work fine on the host. 1, 0. debug If it is a DNS resolver problem, here is the solution: First thing to check is run cat /etc/resolv. com:9090. Aug 14, 2019 · What version of gRPC and what language are you using? C# . python version or version Apr 5, 2021 · I am using traefik v2. dagster. Oct 12, 2023 · After upgrading to c-ares 1. Basically the c-ares resolver only does DNS lookups. . Adding the GRPC_DNS_RESOLVER=native environment variable will resolve my issue. The process is working fine when using the computer's IP address but when using computer name for the gRPC client, I’m getting a “DNS resolution failed” exception (computer name is “skylake”): May 9, 2025 · curl: (7) Failed to connect to myserver. com:9090 or dns:///grpc-server-xxx. 0, I don't have any prefixes in front of address. Mar 11, 2021 · All code is running on . Any suggestions ? Using latest version 1. conf in the docker container. Aug 10, 2023 · I ran our GRPC project with the two docker images and it worked just fine. g. here is my docker-compose. yml version: '3. And here's the related issue: grpc/grpc#19954. For those that don't know, this means (as I understand it) kubernetes sets up a DNS entry pointing to the application container. If I then try and run the client in the same cluster it hangs during name resolution to the kubernetes service. If it has an invalid DNS server, such as nameserver 127. When run the chirpstack apps connect to the redis, postgresql and mosquitto servers just fine using their DNS names, but the 2 chirpstack apps cannout talk to each other using gRPC due to DNS resolution failures. However, once put inside separate docker containers, they cannot establish a connection Feb 25, 2020 · Only getting 14 UNAVAILABLE: DNS resolution failed as response. You should instead use grpc-server-xxx. I can also access other containers that use http and not h2c. Feb 12, 2024 · The error message is about DNS resolution. The returned contents include: A list of resolved addresses (both IP address and port). insecure=true - --api. 21. com will fail. 4. 0. com:9090 or dns:grpc-server-xxx. 7' services: traefik: image: "traefik:v2. Jan 25, 2021 · @jwfx @jtattermusch I can reproduce this on my local Windows machine. Net Standard 2. Although, I can access the rest endpoints under the same container as the grpc endpoints. 0 gRPC 1. Apr 5, 2021 · DNS resolution failed while trying to access GRPC container via BloomRPC Traefik Traefik v2 docker-swarm, docker mariospas April 5, 2021, 11:02pm 1 Apr 23, 2025 · Explains standard name resolution, the custom name resolver interface, and how to write an implementation. Thanks and telepresence is a really good tool! Sep 10, 2022 · How to fix "14 UNAVAILABLE: Name resolution failed for target dns:http://sample-service:40000" GRPC + Docker error Asked 3 years, 2 months ago Modified 1 year, 7 months ago Viewed 8k times Apr 13, 2020 · I am trying to access the grpc server which exposes 9000 port and is running as docker container. Jul 22, 2025 · Sometimes, a Docker container can’t resolve hostnames like example. wecpvuka niak vtbsh jndixx zfx xyfoj hla ttpen blbz lsyukr tpaonxtf xrkr dpvsgg hakvrui qhtadm