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busybox 1.29.3 misbehaving when doing nslookup to public URLs #64

Open shiveshabhishek opened 1 year ago

shiveshabhishek commented 1 year ago

I've seen this strange issue while working with busybox v1.29.3 in Rancher k8s cluster v1.23.13+rke2r1. It's unable to do nslookup

shivesh@shivesh-machine:~/rancher$ kubectl run -i --tty --rm debug --image=busybox:1.29.3  --restart=Never -- sh

If you don't see a command prompt, try pressing enter.

/ # nslookup github.com
Server:     10.43.0.10
Address:    10.43.0.10:53

Non-authoritative answer:

*** Can't find github.com: No answer

But when I'm trying to do the same from pod with the latest busybox image, it worked flawlessly.

shivesh@shivesh-machine:~/rancher$ kubectl run -i --tty --rm debug --image=busybox  --restart=Never -- sh
If you don't see a command prompt, try pressing enter.
/ # 
/ # nslookup google.com
Server:     10.43.0.10
Address:    10.43.0.10:53

Non-authoritative answer:
Name:   google.com
Address: 2404:6800:4007:818::200e

Non-authoritative answer:
Name:   google.com
Address: 142.250.77.174

/ # nslookup github.com
Server:     10.43.0.10
Address:    10.43.0.10:53

Non-authoritative answer:

Non-authoritative answer:
Name:   github.com
Address: 20.207.73.82

/ #