Sometimes it is good to look at a network from the inside of a kubernetes cluster. Well-prepared images do not have any useful networking tools (because they are minimal image designed to do specific task). Therefore, you might need to run commands from a dedicated container. An example of such tool is the netshoot image. It can be found in GitHub: https://github.com/nicolaka/netshoot
It's very easy to run:
kubectl run tmp-shell --rm -i --tty --image nicolaka/netshoot
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