Google Kubernetes Engine (GKE) is one of the most sought-after skills in Cloud & DevOps interviews. Whether you are a beginner or experienced professional, this comprehensive GKE interview Q&A guide will help you crack your next interview with confidence.<\/p>\n\n\n\n
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What is Google Kubernetes Engine (GKE)?<\/h2>\n\n\n\n
![\"\u2705\"](\"https:\/\/fonts.gstatic.com\/s\/e\/notoemoji\/16.0\/2705\/32.png\")
What is Google Kubernetes Engine (GKE)?<\/h2>\n\n\n\nAnswer:<\/strong> Answer:<\/strong> Explanation:<\/strong> Answer:<\/strong> Example:<\/strong> Answer:<\/strong> Answer:<\/strong> Use Case:<\/strong> Answer:<\/strong> Explanation:<\/strong> Answer:<\/strong> Difference from HPA:<\/strong> Answer:<\/strong> Example:<\/strong>
Google Kubernetes Engine (GKE) is a managed, production-ready Kubernetes service by Google Cloud Platform (GCP). It automates deployment, scaling, and management of containerized applications using Kubernetes, ensuring high availability, security, and performance.
It integrates with GCP services like Stackdriver, Cloud IAM, VPC, and load balancing.<\/p>\n\n\n\n
\n\n\n\nTop GKE Interview Questions and Answers<\/h2>\n\n\n\n
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1. What are the key components of GKE Architecture?<\/h2>\n\n\n\n
GKE architecture consists of:<\/p>\n\n\n\n\n
In GKE, you manage workloads on Node Pools while GCP manages control plane components automatically.<\/p>\n\n\n\n
\n\n\n\n 2. What are Node Pools in GKE?<\/h2>\n\n\n\n
Node Pools are groups of nodes within a GKE cluster that share the same configuration (machine type, OS image).
You can have multiple node pools \u2014 each optimized for different workload types.<\/p>\n\n\n\n
Separate node pools for GPU workloads, memory-intensive jobs, or cost-efficient small workloads.<\/p>\n\n\n\n
\n\n\n\n 3. Explain the difference between GKE Standard & Autopilot.<\/h2>\n\n\n\nFeature<\/th> Standard GKE<\/strong><\/th> Autopilot GKE<\/strong><\/th><\/tr><\/thead> Management<\/td> User manages nodes<\/td> GKE manages nodes<\/td><\/tr> Cost Model<\/td> Pay for nodes + pods<\/td> Only pay billed for pod resources<\/td><\/tr> Flexibility<\/td> High<\/td> Lower (opinionated)<\/td><\/tr> Auto Scaling<\/td> Node + Pod Autoscaling<\/td> Automatic scaling<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
GKE Autopilot simplifies operations by abstracting node management. The Standard mode gives full control of nodes, ideal for advanced tuning.<\/p>\n\n\n\n
\n\n\n\n 4. What is Workload Identity in GKE?<\/h2>\n\n\n\n
Workload Identity enables secure authentication between GKE pods and Google Cloud services using Kubernetes Service Accounts mapped to GCP IAM roles \u2014 avoiding service account keys.<\/p>\n\n\n\n
Grant a pod read access to Cloud Storage without storing keys.<\/p>\n\n\n\n
\n\n\n\n 5. What is Horizontal Pod Autoscaler (HPA) in GKE?<\/h2>\n\n\n\n
HPA automatically adjusts the number of pod replicas based on CPU\/memory metrics or custom Prometheus metrics.
This ensures scalability according to workload demand.<\/p>\n\n\n\nkubectl autoscale deployment myapp --cpu-percent=50 --min=2 --max=10\n<\/code><\/pre>\n\n\n\n
When CPU usage crosses the threshold, HPA scales pods up; it scales down when usage drops.<\/p>\n\n\n\n
\n\n\n\n 6. What is Cluster Autoscaler?<\/h2>\n\n\n\n
Cluster Autoscaler dynamically adjusts the number of nodes in a node pool based on pending pods that cannot be scheduled due to resource constraints.<\/p>\n\n\n\n
HPA scales pods, Cluster Autoscaler<\/em> scales nodes.<\/p>\n\n\n\n
\n\n\n\n 7. What is GKE Ingress & how is it different from LoadBalancer?<\/h2>\n\n\n\n
Ingress:<\/strong>
Layer-7 HTTP\/HTTPS traffic controller for routing based on host\/path.
LoadBalancer:<\/strong>
Layer-4 service type exposing one IP per service.<\/p>\n\n\n\n
Use Ingress to route \/api<\/code> \u2192 backend1, \/web<\/code> \u2192 backend2 using a single IP.<\/p>\n\n\n\n
\n\n\n\n 8. What is GKE Pod Security Policy (PSP) \/ Pod Security Standards?<\/h2>\n\n\n\n
![\"\u2714\"](\"https:\/\/fonts.gstatic.com\/s\/e\/notoemoji\/16.0\/2714\/32.png\")
Disallow privileged containers![\"\ud83e\udde0\"](\"https:\/\/fonts.gstatic.com\/s\/e\/notoemoji\/16.0\/1f9e0\/32.png\")
Bonus \u2014 GKE Hands-On Commands Cheat Sheet<\/h1>\n\n\n\n![\"\ud83c\udfaf\"](\"https:\/\/fonts.gstatic.com\/s\/e\/notoemoji\/16.0\/1f3af\/32.png\")
Tips to Crack Your GKE Interview<\/h2>\n\n\n\n![\"\ud83d\udccc\"](\"https:\/\/fonts.gstatic.com\/s\/e\/notoemoji\/16.0\/1f4cc\/32.png\")
Conclusion<\/h2>\n\n\n\n