Q: What is the current version of Kubernetes you are using in your project, and how do you manage version lifecycle and deprecations?
How to professionally articulate your current Kubernetes production version (v1.29/v1.30+), enforce supported version skew across control plane and worker nodes, audit deprecated APIs, and execute rehearsal upgrades.
#Kubernetes #Amazon EKS #Version Management #Cluster Upgrade #API Deprecations #Helm
🎙️ Candidate Opening & Architectural Context
"In my current project, we run Kubernetes v1.29.x in production on Amazon EKS and validate upgrades on v1.30.x in staging before rollout. We maintain strict control plane and node group version skew, track deprecations release-by-release, and run upgrade rehearsals with Helm chart compatibility checks."
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🛠️ Production Runbook & Step-by-Step Resolution
1️⃣
Live Version Auditing & Worker Node Skew Policy
Demonstrate hands-on familiarity with live cluster versions and worker node alignment:
# Check cluster client and server versions
kubectl version --short
# Inspect node versions across the cluster
kubectl get nodes -o wide
kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.nodeInfo.kubeletVersion}{"\n"}{end}'
# Query Amazon EKS control plane version
aws eks describe-cluster --name prod-cluster --region ap-south-1 --query 'cluster.version' --output text- Cluster & Node Version Inspection: Query both client and server versions to ensure API compatibility.
- Version Skew Discipline: Kubernetes supports up to 3 minor versions skew between kube-apiserver and kubelet, but in production we keep worker nodes within 1 minor version of the control plane.
- Cloud Provider Specifics: Query EKS/AKS managed control plane metadata directly via cloud CLI.
2️⃣
Auditing Manifests & Helm Charts for Deprecated APIs
Proactively identify deprecated API versions (e.g. ingress, pdb, autoscaling) before cluster upgrades:
# Check for deprecated API usage in live manifests
kubectl api-resources | grep -i ingress
helm list -A
kubectl get ingress -A -o yaml | grep 'apiVersion:' -n- Inspect live resources: Query active resource API groups and check chart template versions.
- Pre-upgrade scanning: Integrate tools like Pluto or Kube-no-trouble (kubent) into CI/CD pipelines to catch deprecated API calls before merge.
- Canary Node Group Testing: Spin up a canary node pool running the target version to test DaemonSets and CNI compatibility before wide rollout.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Always state the exact minor version (e.g., v1.29.x moving to v1.30.x) and explain the upgrade validation workflow: API deprecation scans, staging rehearsals, and canary node groups."
⚡ 60-Second Elevator Pitch Talking Points
- State live production version (e.g., v1.29.x) and target staging version (v1.30.x) with strict 1-minor-version node group skew.
- Audit API deprecations with kubectl api-resources, Helm chart inspections, and automated Pluto/kubent scans.
- Rehearse upgrades in lower environments with canary node pools before upgrading production control plane and worker nodes.
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