100 Real-World SRE & DevOps Troubleshooting Scenarios: A Beginner-to-Advanced Field Guide to Production Incidents, Linux, AWS, Docker, Kubernetes, Databases, Observability, CI/CD, and Security

This book is a practical guide to solving real-world production problems encountered by SRE, DevOps, cloud, platform, and software engineers. It presents 100 troubleshooting scenarios covering Linux servers, networking, DNS, TLS, AWS, Docker, Kubernetes, databases, Redis, Kafka, monitoring, CI/CD pipelines, infrastructure as code, security, and major-incident management.Each scenario begins with realistic symptoms and customer impact before guiding the reader through the investigation. It explains what to check first, which commands and diagnostic queries to use, how to identify the root cause, and how to restore the service safely. The scenarios also highlight common troubleshooting mistakes, long-term prevention measures, interview questions, and practical exercises.Rather than encouraging readers to memorize commands, the book develops a structured troubleshooting mindset. Readers learn how to determine the scope of an incident, correlate failures with recent changes, test hypotheses, select reversible mitigations, verify recovery using customer-focused signals, and prevent recurring outages.Designed for beginner-to-advanced readers, this book is suitable for aspiring and experienced SREs, DevOps engineers, cloud engineers, system administrators, developers, and production-support professionals. It can be used as a learning guide, production reference, troubleshooting handbook, or technical interview preparation resource.