DevOps & Cloud Interview Prep: Real Scenarios & Answers

DevOps & Cloud Interview Prep: Real Scenarios & Answers

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DevOps & Cloud Interview Prep: Real Scenarios & Answers episodes

  • Kyverno Pod Security: Allowing NET_RAW for Legacy Apps

    When legacy workloads need NET_RAW, blanket Pod Security Admission enforcement breaks them — this episode walks through using Kyverno mutation policies to handle the exception without weakening your cluster-wide baseline.

    You'll learn:

    • Why NET_RAW is dropped by the Kubernetes restricted and baseline PSA profiles and what that breaks in practice
  • How to write a Kyverno mutate policy that injects a securityContext exception for specific legacy workloads
  • Namespace-scoping strategies so your mutation doesn't accidentally widen the attack surface cluster-wide
  • How to test policy enforcement with kubectl --dry-run and Kyverno's CLI before rolling to production
  • Common gotchas: policy ordering, admission webhook conflicts, and audit vs enforce mode differences

    • Keywords: Kyverno mutation policy, Pod Security Admission NET_RAW, Kubernetes pod security, PSA legacy workloads, Kyverno securityContext

    🎧 Listen, then go deeper — DevOps & Cloud interview-prep ebooks at DevOpsInterview.Cloud

    14 min
  • Java 21 Lambda Cold Starts: SnapStart vs Provisioned Concurrency vs GraalVM

    Cold start mitigation for Java 21 Lambda at 50K RPS is one of the most punishing interview questions for senior cloud engineers — here's how to compare the three real options without hand-waving.

    You'll learn:

    • How SnapStart snapshots the Afterburner-restored JVM state and where it still adds latency on restore
  • Why Provisioned Concurrency keeps execution environments warm but drives up cost at sustained 50K RPS
  • Where GraalVM native compilation wins on p99 cold-start time and what you sacrifice in build complexity and reflection support
  • How to frame the tradeoff in an interview: cost per invocation, tail latency SLOs, and CI/CD pipeline impact
  • Which option AWS recommends for high-throughput workloads and why that answer depends on traffic shape

    • Keywords: Java Lambda cold start, SnapStart vs provisioned concurrency, GraalVM native Lambda, AWS Lambda 50K RPS, Lambda performance tuning

    🎧 Listen, then go deeper — DevOps & Cloud interview-prep ebooks at DevOpsInterview.Cloud

    21 min
  • Kata Containers: Diagnosing ’Container Not Started’ Errors

    When eBPF-based security profiles silently block syscalls in a Kata Containers runtime, tracking down 'container not started' errors requires knowing exactly where to look.

    You'll learn:

    • How Kata Containers' nested virtualization layer changes where failures actually surface versus standard runc
  • Why eBPF security profiles (Seccomp, BPF-LSM) can silently drop syscalls that the guest kernel needs at startup
  • Using dmesg, kata-runtime logs, and bpftool prog tracelog to correlate guest-side panics with host-side policy denials
  • Common gotchas: mismatched kernel versions between host and guest image causing profile incompatibilities
  • How to audit and iterate on allow-lists without disabling your security profile entirely

    • Keywords: Kata Containers debugging, eBPF security profiles, container runtime errors, Seccomp troubleshooting, SRE interview prep

    🎧 Listen, then go deeper — DevOps & Cloud interview-prep ebooks at DevOpsInterview.Cloud

    14 min
  • S3 Object Lambda: Redact PII from Legacy Data Without ETL

    S3 Object Lambda lets you dynamically redact PII from petabytes of legacy data at read time — no ETL pipelines, no data duplication, no migration headaches.

    You'll learn:

    • How S3 Object Lambda intercepts GetObject calls to transform data on the fly before it reaches the caller
  • Wiring a Lambda function to an Object Lambda Access Point to strip or mask PII fields in real time
  • Why this approach beats ETL for legacy datasets: no reprocessing, no storage doubling, no pipeline maintenance
  • Common gotchas — Lambda timeout limits, response size caps, and IAM permission layering across access points
  • When to combine S3 Object Lambda with Macie for automated PII detection before writing redaction logic

    • Keywords: S3 Object Lambda interview, redact PII AWS, AWS data privacy without ETL, S3 access point Lambda transform

    🎧 Listen, then go deeper — DevOps & Cloud interview-prep ebooks at DevOpsInterview.Cloud

    17 min
  • AWS Global Accelerator Latency: Direct Connect Troubleshooting

    Latency spikes in an AWS Global Accelerator setup with Direct Connect are notoriously hard to pin down — this episode walks through a structured troubleshooting approach including VPC Flow Logs analysis.

    You'll learn:

    • How to isolate whether latency originates at the Global Accelerator edge, the Direct Connect path, or inside the VPC
  • Reading VPC Flow Logs to identify packet loss, retransmits, and asymmetric routing across regions
  • Using CloudWatch Network Monitor and AWS Health events to correlate inter-region degradation
  • Common Direct Connect BGP misconfiguration gotchas that cause intermittent spikes rather than full outages
  • When to escalate to AWS Support with the right data already gathered

    • Keywords: AWS Global Accelerator troubleshooting, Direct Connect latency, VPC Flow Logs analysis, inter-region latency AWS, BGP misconfiguration AWS

    🎧 Listen, then go deeper — DevOps & Cloud interview-prep ebooks at DevOpsInterview.Cloud

    16 min
  • AKS Zero-Trust Access: Arc, OPA Gatekeeper & On-Prem

    Architecting zero-trust access to an AKS cluster from on-prem legacy systems is one of those senior interview questions that exposes whether you actually understand the control plane or just know the buzzwords.

    You'll learn:

    • How Azure Arc projects on-prem and legacy workloads into the Azure control plane without exposing the API server publicly
  • Where OPA Gatekeeper fits — enforcing admission policies at the Kubernetes layer so workloads that pass network controls still get policy-checked
  • Layering Azure AD Workload Identity and managed identities to eliminate long-lived credentials between legacy systems and AKS
  • Private endpoint and Azure Private Link design decisions that keep east-west traffic off the public internet
  • Common gotchas: Gatekeeper constraint template scope, Arc-enabled Kubernetes agent connectivity requirements, and policy exemption risks

    • Keywords: AKS zero-trust, Azure Arc Kubernetes, OPA Gatekeeper interview, on-prem to AKS security, Azure private endpoint AKS

    🎧 Listen, then go deeper — DevOps & Cloud interview-prep ebooks at DevOpsInterview.Cloud

    11 min
  • Quantum-Resistant Encryption on GCP: Kyber, Dilithium & Key Rotation

    Securing inter-region data in transit on Google Cloud with post-quantum algorithms like Kyber and Dilithium is fast becoming a senior interview topic — here's how to design it properly.

    You'll learn:

    • Why NIST-selected algorithms Kyber (key encapsulation) and Dilithium (digital signatures) are the go-to choices for post-quantum TLS on GCP
  • How to layer quantum-resistant encryption over inter-region traffic using Cloud VPN or BoringSSL-backed load balancers
  • Designing a key rotation strategy that handles hybrid classical/PQC key pairs without dropping connections
  • GCP-specific controls — Cloud KMS, Certificate Authority Service, and rotation scheduling via Cloud Scheduler
  • Common interview gotchas: algorithm maturity trade-offs, latency impact of larger PQC key sizes, and hybrid mode rollout

    • Keywords: post-quantum encryption GCP, Kyber Dilithium TLS, quantum-resistant key rotation, GCP inter-region security, Cloud KMS post-quantum

    🎧 Listen, then go deeper — DevOps & Cloud interview-prep ebooks at DevOpsInterview.Cloud

    19 min
  • Multi-Cloud Video Pipeline: Active-Active Under 100ms

    Designing an active-active video processing pipeline across AWS Elemental MediaLive and Azure Media Services — while hitting sub-100ms end-to-end latency — is exactly the kind of system design question that separates senior candidates from the rest.

    You'll learn:

    • How to architect an active-active topology spanning AWS and Azure without a single-cloud bottleneck
  • State synchronization patterns for keeping MediaLive and Azure Media Services in lockstep during failover
  • Where latency actually gets eaten in a multi-cloud video pipeline and how to budget your 100ms budget across encode, transit, and egress
  • Trade-offs between consistency and availability when both clouds are simultaneously serving live streams

    • Keywords: multi-cloud video pipeline interview, AWS Elemental MediaLive design, active-active architecture, sub-100ms latency system design, cloud video streaming SRE

    🎧 Listen, then go deeper — DevOps & Cloud interview-prep ebooks at DevOpsInterview.Cloud

    27 min

About DevOps & Cloud Interview Prep: Real Scenarios & Answers

From the publisher's feed

Real DevOps and Cloud interview questions, answered the way a senior engineer actually would. Each episode breaks down a production scenario — Kubernetes, AWS, Azure, GCP, Terraform, CI/CD, observability, security - with the short answer, the deep dive, and the gotchas interviewers probe for.