Q: What is the difference between ClusterIP, NodePort, and LoadBalancer service types?
- ClusterIP — only accessible inside the cluster. Default type. Used for internal service-to-service communication.
#Kubernetes #Networking #L1 #Container Orchestration #K8s
🎙️ 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
Initial Diagnostics & Root Cause Analysis
- ClusterIP — only accessible inside the cluster. Default type. Used for internal service-to-service communication.
- NodePort — opens a port (30000–32767) on every node. Traffic to
: - LoadBalancer — creates a cloud load balancer (AWS ELB, GCP LB) and assigns an external IP. Used in production to expose services to the internet. Only works in cloud environments.
2️⃣
Remediation & Permanent Safeguards
Execute the resolution runbook and verify workload health:
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: ClusterIP — only accessible inside the cluster. Default type. Used for internal service-to-service communication.."
⚡ 60-Second Elevator Pitch Talking Points
- ClusterIP — only accessible inside the cluster. Default type. Used for internal service-to-servic...
- NodePort — opens a port (30000–32767) on every node. Traffic to : reaches the service. Used for d...
- LoadBalancer — creates a cloud load balancer (AWS ELB, GCP LB) and assigns an external IP. Used i...
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