Question
How to "fix server can't find external_domain: SERVFAIL" inside pod
- Posted on March 9, 2023
- DigitalOcean Managed KubernetesKubernetes
Asked by Dmitrii Paivin
Hello! I am using DO managed Kubernetes and I’ve met the following problem: My services try to send a request to sgx.geodatenzentrum.de but instead of a response, my service gets an error. Here is nslookup output:
nslookup sgx.geodatenzentrum.de
Server: 10.245.0.10
Address: 10.245.0.10:53
Non-authoritative answer:
Name: sgx.geodatenzentrum.de
Address: 141.74.48.40
** server can't find sgx.geodatenzentrum.de: SERVFAIL
Then I tested this domain on my own laptop and everything was fine:
nslookup sgx.geodatenzentrum.de
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
Name: sgx.geodatenzentrum.de
Address: 141.74.48.40
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Hi there,
The DigitalOcean Kubernetes uses CoreDNS for cluster DNS management.
I could suggest a couple of things here:
Check the logs of the CoreDNS pods to see if there’s any specific error or warning that might indicate what’s going wrong. You can do this with:
Sometimes, simply restarting the CoreDNS pods can solve transient issues. You can do this with:
You can view the CoreDNS settings used by DOKS in the CoreDNS’s configuration file using the following command:
Also for more informaiton on how to customize the CoreDNS settings, I could suggest the following guide:
https://docs.digitalocean.com/products/kubernetes/how-to/customize-coredns/
Best,
Bobby