Let’s fix the Error “getaddrinfo ENOTFOUND” on Kubernetes with this new article. As part of our Kubernetes Support, Bobcares provides answers to all of your questions.

Error “getaddrinfo ENOTFOUND” on Kubernetes

In Kubernetes, the “getaddrinfo ENOTFOUND” error usually means that there is a DNS resolution issue. When Kubernetes tries to connect with resources either inside or outside the cluster, it encounters this problem because it cannot resolve the domain name to an IP address. Following are the steps to troubleshoot and fix the problem:

1. Initially, determine which resource is having the issue. This will assist us in focusing on the troubleshooting procedures.

2. Make sure the DNS setup for the Kubernetes cluster is accurate. When converting domain names to IP addresses, DNS is essential.

3. Use the kubectl get pods -n kube-system command to verify the status of the CoreDNS pods if the cluster uses CoreDNS for DNS resolving. Also, verify that they are operating and not stuck in a crash loop.

4. Make sure the custom DNS config, as well as policies, are proper if we’re using them.

5. Then, check to see if the Kubernetes nodes’ DNS service is operating properly. Domain name resolution is the responsibility of this service.

6. Make sure the configurations are in place if the cluster is protected by a corporate firewall. Also, if it is subject to network policies that may have an impact on DNS resolution.

7. Also, verify the nodes’ DNS settings on those hosting the impacted resources. The DNS servers on the nodes have to be set up properly.

8. Make sure that the nodes are connected to DNS servers over the network. Since DNS traffic may be blocked by network problems or firewall policies.

9. Then, make sure the configuration of the DNS setup for the pod is correct if the problem is within it. Also, make sure the correct DNS settings are in the pod’s /etc/resolv.conf file.

10. Make sure the DNS name for the Kubernetes service is correct if that’s the cause of the problem.

11. Verify the service names in the app code, as well as the configuration, are right if the app depends on DNS-based service discovery.

12. Also, look for any entries in the /etc/hosts file on the nodes that can interfere with DNS resolution.

13. If the error occurs when accessing resources outside the cluster, ensure that external DNS servers are reachable and correctly configured in the cluster.

14. Make use of tools like ping, nslookup, or dig from within pods or nodes in order to test DNS resolution for specific domain names.

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Conclusion

We can easily fix the “getaddrinfo ENOTFOUND” error on Kubernetes using the above troubleshooting steps.