Q: What is an Admission Controller and how does Kubernetes use them?
Plugins that intercept API requests AFTER authentication/authorization but BEFORE persistence in etcd. Two types: Mutating (modify the re...
#Kubernetes #Additional Kubernetes Scenarios (Q101-Q200) #L3 #Container Orchestration #K8s #etcd
🎙️ Candidate Opening & Architectural Context
""In our production Kubernetes clusters running microservices on EKS/AKS, this was a classic operational challenge. When addressing this question, I walk the interviewer through our production incident runbook: isolating the blast radius, checking diagnostic logs and metrics, and applying a safe fix.""
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🛠️ Production Runbook & Step-by-Step Resolution
1️⃣
Production Solution & Architecture
Plugins that intercept API requests AFTER authentication/authorization but BEFORE persistence in etcd. Two types: Mutating (modify the resource) and Validating (accept/reject). Built-in examples: NamespaceLifecycle (rejects resources in terminating namespaces), ResourceQuota (rejects resources that exceed quota), LimitRanger (sets default limits). Custom ones use webhook admission.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: Plugins that intercept API requests AFTER authentication/authorization but BEFORE persistence in etcd. Two types: Mutating (modify."
⚡ 60-Second Elevator Pitch Talking Points
- Immediate Triage: Plugins that intercept API requests AFTER authentication/authorization but BEFORE persistence i
- Run targeted verification commands before modifying configuration.
- Automate permanent guardrails (CI check, alerts, IaC policy) to prevent recurrence.
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