Q: What is an Ingress and why do you need it when you already have LoadBalancer services?
Every LoadBalancer service creates a new cloud load balancer = new cost + new IP address. For 10 services, that's 10 load balancers.
#Kubernetes #Networking #L2 #Container Orchestration #K8s #Ingress
🎙️ Candidate Opening & Architectural Context
""When troubleshooting Kubernetes, I always follow a structured layered model: Pod status -> Events -> Logs -> Network. 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
Every LoadBalancer service creates a new cloud load balancer = new cost + new IP address. For 10 services, that's 10 load balancers.
api.myapp.com→ API serviceapp.myapp.com→ Frontend servicemyapp.com/admin→ Admin service
2️⃣
Remediation & Permanent Safeguards
Ingress uses one load balancer (the Ingress Controller) and routes HTTP/HTTPS traffic to different services based on hostname or URL path rules. Much cheaper and cleaner. Example: All through one load balancer.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: api.myapp.com → API service."
⚡ 60-Second Elevator Pitch Talking Points
- api.myapp.com → API service
- app.myapp.com → Frontend service
- myapp.com/admin → Admin service
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