nslookup doesn't work on 1.31.1

[xinwo]

Reproduce steps

1. kubectl run busybox1 --generator=run-pod/v1 --image=busybox:1.28 -- sleep 3600
2. kubectl run busybox2 --generator=run-pod/v1 --image=busybox:1.31.1 -- sleep 3600
3. kubectl exec -ti busybox1 -- nslookup kubernetes.default
   works fine

Server:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

Name:      kubernetes.default
Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local

4. kubectl exec -ti busybox2 -- nslookup kubernetes.default
   not working

Server:         10.96.0.10
Address:        10.96.0.10:53

** server can't find kubernetes.default: NXDOMAIN

*** Can't find kubernetes.default: No answer

command terminated with exit code 1

nslookup works differently on 1.31.1?
what's the correct way to use nslookup on 1.31.1?

[wglambert]

This is an upstream BusyBox issue, there was a bug report filed at https://bugs.busybox.net/show_bug.cgi?id=11161

We had a few issues on this
#61 (comment), #48 (comment)

I'm going to close since there isn't anything we can do as maintainers of the image to alleviate this issue and it's been forwarded to upstream