Debug pod with ephemeral container

Attach an ephemeral debug container to a running pod

kubectl debug -it mypod --image=busybox --target=app

More k8s-debug commands

Run debug pod on node

kubectl debug node/my-node -it --image=ubuntu

Get privileged shell on a cluster node via debug pod
Exec into sidecar container

kubectl exec -it mypod -c sidecar-name -- /bin/sh

Open shell in a specific container of a multi-container pod
Check resource requests/limits

kubectl get pod mypod -o jsonpath='{range .spec.containers[*]}{.name}{"\t"}{.resources}{"\n"}{end}'

Show resource requests and limits for each container
Describe node conditions

kubectl describe node my-node | grep -A5 'Conditions:'

Check node conditions: Ready, MemoryPressure, DiskPressure
Find pods by resource usage

kubectl top pods -A --sort-by=memory | head -20

Top 20 pods sorted by memory consumption