Improvement for k8s.io/docs/tasks/debug-application-cluster/debug-running-pod/

[guettli]

The command nslookup of busybox is broken since several month.

The above page uses the image busybox.

This drove me crazy during the last hours.

Here the example of my KinD cluster:

root@kind-control-plane:/# kubectl run -it --rm --restart=Never busybox --image=busybox sh

/ # nslookup kubernetes.default
Server:		10.96.0.10
Address:	10.96.0.10:53

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

busybox:1.28 works:

root@kind-control-plane:/# kubectl run -it --rm --restart=Never busybox --image=busybox:1.28 sh

/ # nslookup kubernetes.default
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

I very big thank you for the people in #kubernetes-users for pointing me into the right direction.

Related issue: docker-library/busybox#48 (closed because upstream needs to solve this)

---

It would be good if the above page would use busybox:1.28 instead of busybox.

I can do the change (PR), but first I want to know what you think. Maybe there is a better solution. Maybe there is a better base-image than busybox.

[tengqm]

/triage accepted
/kind bug
PRs are welcomed.

[guettli]

I created a PR: #31989