For follower growth + interview value, Day 14 should be a question that:Appears repeatedly in DevOps interviewsHas a real production scenarioCreates curiosityMakes people stop scrollingApplies to Kubernetes, EKS, AKS, GKE, OpenShiftOne of the highest-performing topics is:đź”´ DAY 14Kubernetes Pod Is Running But Readiness Probe FailsQuestionA production deployment was completed successfully.You verify:âś… Pod Runningâś… Container Startedâś… No CrashLoopBackOffâś… No OOMKilledBut:❌ Service is not sending traffic❌ Endpoints are empty❌ Users cannot access the applicationPod status:kubectl get podsOutput:1/1 Running0/1 ReadyHow is the Pod Running but not Ready?How would you troubleshoot this issue?—Why This Gets ViewsMost engineers think:Running = HealthyInterviewers know:Running ≠ ReadyThis creates curiosity and drives saves/shares.—Expected Areasâś” Readiness Probesâś” Liveness Probesâś” Service Endpointsâś” Application Startupâś” Health Check URLsâś” Port Configurationâś” Traffic Routingâś” Kubernetes Networking—Common Root CausesIssue ResultWrong readiness path Not ReadyWrong port Not ReadySlow startup Not ReadyDatabase dependency failure Not ReadyExternal API failure Not ReadyApplication health endpoint broken Not Ready—Senior Engineer FlowPod Running ↓Readiness Probe ↓Endpoints ↓Service ↓Ingress ↓Users—Follow-Up Questionsâť“ Difference between Liveness and Readiness?âť“ Can a Running Pod receive no traffic?âť“ Why are Endpoints empty?âť“ What happens if Readiness fails?âť“ How do you debug probe failures?âť“ Should you restart the Pod immediately?—Thumbnail Textđźź© DAY 14⚪ 30 DAYS DEVOPS INTERVIEW SERIESđźź© POD IS RUNNINGBUT NOT READYâť“ NO TRAFFICâť“ ENDPOINTS EMPTYâť“ WHY?⚠️ REAL PRODUCTION INCIDENTThis topic typically performs better than generic Kubernetes questions because it’s a production issue that many engineers have faced and many interviewers ask.

Kubernetes Pod Is Running But Readiness Probe Fails

Question

A production deployment was completed successfully.

You verify:

âś… Pod Running

âś… Container Started

âś… No CrashLoopBackOff

âś… No OOMKilled

But:

❌ Service is not sending traffic

❌ Endpoints are empty

❌ Users cannot access the application

Pod status:

kubectl get pods

Output:

1/1 Running
0/1 Ready

How is the Pod Running but not Ready?

How would you troubleshoot this issue?


Why This Gets Views

Most engineers think:

Running = Healthy

Interviewers know:

Running ≠ Ready

This creates curiosity and drives saves/shares.


Expected Areas

âś” Readiness Probes

âś” Liveness Probes

âś” Service Endpoints

âś” Application Startup

âś” Health Check URLs

âś” Port Configuration

âś” Traffic Routing

âś” Kubernetes Networking


Common Root Causes

IssueResult
Wrong readiness pathNot Ready
Wrong portNot Ready
Slow startupNot Ready
Database dependency failureNot Ready
External API failureNot Ready
Application health endpoint brokenNot Ready

Senior Engineer Flow

Pod Running
      ↓
Readiness Probe
      ↓
Endpoints
      ↓
Service
      ↓
Ingress
      ↓
Users

Follow-Up Questions

âť“ Difference between Liveness and Readiness?

âť“ Can a Running Pod receive no traffic?

âť“ Why are Endpoints empty?

âť“ What happens if Readiness fails?

âť“ How do you debug probe failures?

âť“ Should you restart the Pod immediately?


Thumbnail Text

đźź© DAY 14

⚪ 30 DAYS DEVOPS INTERVIEW SERIES

đźź© POD IS RUNNING

BUT NOT READY

âť“ NO TRAFFIC

âť“ ENDPOINTS EMPTY

âť“ WHY?

⚠️ REAL PRODUCTION INCIDENT

This topic typically performs better than generic Kubernetes questions because it’s a production issue that many engineers have faced and many interviewers ask.