DevOps & Cloud Interview Questions and Answers - Part 1

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  1. 28. FEB.

    Midnight Cleanup: Consolidation & Drift (Karpenter)

    SCENARIO: It's 2 AM, traffic is at 5%, but we have 50 nodes running at 10% utilization. Also, some nodes are running an old AMI from 3 months ago. How does Karpenter handle both issues? WHAT THEY'RE TESTING: Consolidation, Drift Detection, Expiration (TTL) THE ANSWER: • CONSOLIDATION (underutilized nodes):  disruption:  consolidationPolicy: WhenEmptyOrUnderutilized  consolidateAfter: 30s  - Karpenter identifies low-utilization nodes  - Drains pods to other nodes, terminates empty ones • DRIFT DETECTION (old AMI):  - Karpenter compares node spec vs current NodeClass  - If AMI changed in NodeClass, node is marked 'drifted'  - Gracefully replaces with new node running correct AMI • EXPIRATION (TTL):  expireAfter: 720h # Force refresh every 30 days → All three are types of DISRUPTION - Karpenter's cleanup mechanism

    25 Min.

  2. 26. JAN.

    Unstuck: The Karpenter Lifecycle

    SCENARIO: You deploy a new ML training job requiring 8 GPUs, but pods are stuck in Pending. The K8s Scheduler logs show 'no nodes available'. Walk me through exactly what Karpenter does to resolve this, step by step. WHAT THEY'RE TESTING: K8s Scheduler vs Karpenter's role, the 4-step lifecycle THE ANSWER: • WATCH: Karpenter controller watches for pods marked 'unschedulable' by K8s scheduler • EVALUATE: Reads ALL constraints from Pod Spec:  - Resource requests (8 GPUs, memory, CPU)  - nodeSelector, nodeAffinity, tolerations  - Topology spread constraints • PROVISION: Calls AWS EC2 API to launch instance matching ALL requirements  - Selects p3.16xlarge (8 GPUs) in correct zone  - Applies NodePool's taints, labels, kubelet config • RESULT: Node joins cluster, K8s scheduler binds the pod → Key insight: Karpenter provisions, K8s scheduler still does final binding!

    39 Min.

  3. 18.09.2025

    Migrate a stateful .NET app from Azure VMs to Azure Container Apps with zero downtime. Handle SQL Server Always On AG failover.

    Migrate a stateful .NET app from Azure VMs to Azure Container Apps with zero downtime. Handle SQL Server Always On AG failover. 🎓 Ideal for: Cloud Engineers, DevOps Architects, SREs, Platform Engineers 🌐 For full transcripts, diagrams & PDF downloads, visit: 👉 https://www.DevOpsInterview.Cloud 📥 Download our ebook: 100 Real-World DevOps & Cloud Questions

    17 Min.

  4. 10.09.2025

    Design Multi-Tenant Argo CD: SSO, Cluster Sharding & Namespace Isolation

    📌 Design multi-tenant Argo CD with SSO, cluster sharding, and namespace isolation for 100+ teams. 🎓 Ideal for: Cloud Engineers, DevOps Architects, SREs, Platform Engineers 🌐 For full transcripts, diagrams & PDF downloads, visit: 👉 www.DevOpsInterview.Cloud 📥 Download our ebook: 100 Real-World DevOps & Cloud Questions

    19 Min.

  5. 09.09.2025

    Implement Pod Security Admission for Legacy Apps with NET_RAW Using Kyverno

    📌 Implement pod security admission for legacy apps requiring `NET_RAW` capability. Use Kyverno mutation policies. 🎓 Ideal for: Cloud Engineers, DevOps Architects, SREs, Platform Engineers 🌐 For full transcripts, diagrams & PDF downloads, visit: 👉 www.DevOpsInterview.Cloud 📥 Download our ebook: 100 Real-World DevOps & Cloud Questions

    14 Min.

  6. 01.09.2025

    Cold start mitigation for Java 21 Lambda functions processing 50K RPS: Compare SnapStart vs. Provisioned Concurrency vs. native compilation.

    Cold start mitigation for Java 21 Lambda functions processing 50K RPS: Compare SnapStart vs. Provisioned Concurrency vs. native compilation. What You'll Learn: - Short and long-form explanations of cold start mitigation approaches - Strategies for ultra-high throughput Lambda (50,000 RPS) on Java 21 🌐 https://www.DevOpsInterview.Cloud 📥 Download our ebook: 100 Real-World DevOps & Cloud Questions

    20 Min.

  7. 26.08.2025

    Diagnose “container not started” errors in a Kata Containers runtime environment with eBPF-based security profiles.

    Diagnose “container not started” errors in a Kata Containers runtime environment with eBPF-based security profiles. Ideal for: Cloud Engineers, DevOps Architects, SREs, Platform Engineers https://www.DevOpsInterview.Cloud

    13 Min.

  8. 25.08.2025

    Implement S3 Object Lambda to dynamically redact PII from petabytes of legacy data without ETL jobs.

    Implement S3 Object Lambda to dynamically redact PII from petabytes of legacy data without ETL jobs. 🎓 Ideal for: Cloud Engineers, DevOps Architects, SREs, Platform Engineers 🌐 For full transcripts, diagrams & PDF downloads, visit: 👉 https://www.DevOpsInterview.Cloud 📥 Download our ebook: 100 Real-World DevOps & Cloud Questions

    17 Min.

  9. 25.08.2025

    Troubleshoot inter-region latency spikes in an AWS Global Accelerator setup with Direct Connect. Include VPC Flow Logs analysis.

    📌 Troubleshoot inter-region latency spikes in an AWS Global Accelerator setup with Direct Connect. Include VPC Flow Logs analysis. 🎓 Ideal for: Cloud Engineers, DevOps Architects, SREs, Platform Engineers 🌐 For full transcripts, diagrams & PDF downloads, visit: 👉 https://www.DevOpsInterview.Cloud 📥 Download our ebook: 100 Real-World DevOps & Cloud Questions

    16 Min.

  10. 25.08.2025

    Architect zero-trust access to an Azure Kubernetes Service (AKS) cluster from on-prem legacy systems using Azure Arc and OPA Gatekeeper.

    📌 Architect zero-trust access to an Azure Kubernetes Service (AKS) cluster from on-prem legacy systems using Azure Arc and OPA Gatekeeper. 🌐 For full transcripts, diagrams & PDF downloads, visit: 👉 https://www.DevOpsInterview.Cloud 📥 Download our ebook: 100 Real-World DevOps & Cloud Questions

    10 Min.

  11. 22.08.2025

    Implement quantum-resistant encryption for data in transit between GCP regions using Kyber or Dilithium algorithms.

    📌 Implement quantum-resistant encryption for data in transit between GCP regions using Kyber or Dilithium algorithms. Detail key rotation. 🔐 This video explains how to secure inter-region traffic on Google Cloud using post-quantum encryption algorithms like Kyber and Dilithium, with a focus on designing a robust key rotation process. 🌐 Visit: https://www.DevOpsInterview.Cloud

    18 Min.

  12. 21.08.2025

    Design a Multi-Cloud Active-Active Video Pipeline With Sub-100ms Latency

    Design a multi-cloud active-active video processing pipeline (AWS Elemental MediaLive + Azure Media Services) with 100ms E2E latency. How do you synchronize state across clouds? - Clear, actionable breakdowns of both short and in-depth solutions. - Proven state synchronization patterns to bridge AWS and Azure. 🎓 Ideal for: Cloud Engineers, DevOps Architects, SREs, Platform Engineers 🌐 Visit: https://www.DevOpsInterview.Cloud

    26 Min.
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