Challenges

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7 of 53 challenges

Kubernetes

7

LockedA Traffic Spike Caused an Outage. Autoscaling Did Not Save You.A spike took the service down even though autoscaling was on. A teammate wants to crank the max replicas. Defend the real fix.intermediate13 minintermediate13 min
LockedPod Stuck in CrashLoopBackOff After a DeployA new deploy leaves a pod in CrashLoopBackOff. A teammate wants to bump CPU and memory. Defend how you actually diagnose it.intermediate12 minintermediate12 min
LockedPods Keep OOMKilling: Scale Up or Fix the Leak?A service OOMKills every few hours. Adding replicas or raising memory limits buys time. Defend whether to scale around it or fix the root cause.intermediate12 minintermediate12 min
LockedA Container in Prod Is Mining CryptoA pod is pegging CPU running a crypto miner. A teammate wants to kubectl delete it and move on. Defend the real response.advanced15 minadvanced15 min
LockedAn EKS Pod Needs AWS Access. Attach It to the Node Role?A pod needs to read S3, and a teammate wants to add the permission to the EKS node role to unblock it. Defend the least-privilege approach.advanced15 minadvanced15 min
LockedService A Intermittently Cannot Reach Service BOne in twenty calls between two services fails. A teammate wants to add retries and move on. Defend how you actually find the cause.advanced15 minadvanced15 min
LockedUnder Load, Healthy Pods Keep Restarting. Add Replicas?During traffic peaks, Kubernetes keeps killing pods that are not actually broken. A teammate wants to scale up replicas. Defend the real fix.advanced14 minadvanced14 min