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bongoDev | DNS Troubleshooting: Resolution, Delegation, Caching & Split-Horizon - Production Troubleshooting Pro

TopicProduction Troubleshooting Pro

01Production Troubleshooting Mental Model: Evidence Before ActionPreview
02Troubleshooting vs Incident Response vs Root Cause Analysis
03Hypothesis-Driven Troubleshooting: Use the Scientific Method
04Scope, Timeline & Recent Change: Establish the Shape of the Failure
05Trace the Critical Request Path: Edge → Service → Dependency → Data
06Observability Evidence: Correlate Metrics, Logs, Traces & Events
07Evidence Hygiene: Timestamps, Vantage Points, Baselines & State Preservation
08Production Triage Decision Tree: Classify Before You Dive
09Linux Host Triage: Establish Host Health in Five Minutes
10CPU Saturation, Load, Scheduler Pressure & Throttling
11Memory Pressure, OOM, Leaks, Swap & Garbage Collection
12Disk, Filesystems, Inodes & I/O Latency
13Processes, Threads, File Descriptors & Socket Exhaustion
14systemd, Journald, Kernel & Boot-Time Failures
15Network Path Troubleshooting: Layer by Layer
16DNS Troubleshooting: Resolution, Delegation, Caching & Split-Horizon
17TCP, Ports & Connection States: Refused vs Timeout vs Reset
18TLS, Certificates, SNI & mTLS Troubleshooting
19HTTP & API Troubleshooting: Status, Headers, Timeouts & Payloads
20CDN, WAF, Proxies & Load Balancers
21Docker & Container Runtime Troubleshooting
22Kubernetes Pod & Container Lifecycle Troubleshooting
23Kubernetes Services, DNS, CNI & NetworkPolicy Troubleshooting
24Kubernetes Nodes, Scheduling, Evictions & Resource Pressure
25Cloud Troubleshooting: IAM, Network, Quotas & Managed Services
26Database Troubleshooting: Connections, Locks, Slow Queries & Replicas
27Redis & Cache Troubleshooting: Latency, Memory, Eviction & Hot Keys
28Queues, Kafka & Event Pipeline Troubleshooting
29Storage Troubleshooting: Block, File, Object & Persistent Volumes
30CI/CD & Deployment Troubleshooting: When Production Breaks After Change
31GitOps & Argo CD Troubleshooting: Desired State vs Live State
32Configuration, Secrets, Feature Flags & Environment Drift
33Dependency Failures, Timeouts, Retries & Cascading Outages
34Latency & Performance Troubleshooting: Find Where the Time Goes
35Capacity, Autoscaling, Throttling & Rate-Limit Troubleshooting
36Concurrency, Locks, Thread Pools & Race Conditions
37Time, Clock Skew, NTP, Token & Certificate Failures
38Data Correctness, Stale Reads & Corruption Troubleshooting
39Distributed-System Partial Failure & Consistency Problems
40“Works Here, Fails There”: Environment & Vantage-Point Troubleshooting
41Production-Safe Mitigation: Restart, Rollback, Scale, Drain or Fail Over?
42Escalation, Vendor Evidence & Knowing When to Stop Digging
43Lab 1 — Slow API After Deployment: Find the Bottleneck
44Lab 2 — 502/503 Across Kubernetes & Load Balancer
45Lab 3 — Database Saturation, Cache Miss Storm & Queue Backlog
46Cross-Stack Production Troubleshooting Playbook
47Production Troubleshooting Command & Evidence Playbook
48Production Troubleshooting Pro Cheatsheet

Englishবাংলা

Knowledge Hub/Production Troubleshooting Pro/DNS Troubleshooting: Resolution, Delegation, Caching & Split-Horizon

Production Troubleshooting Pro

Paid lesson · Advanced · 36 min read

DNS Troubleshooting: Resolution, Delegation, Caching & Split-Horizon

Diagnose DNS failures involving wrong answers, stale caches, search domains, delegation, TTLs, private/public zones and Kubernetes DNS.

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PreviousNetwork Path Troubleshooting: Layer by LayerLocked NextTCP, Ports & Connection States: Refused vs Timeout vs ResetLocked

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