November 3, 2025
Measure Kafka consumer lag, find the bottleneck, and fix slow consumers, partition limits, broker pressure, or network issues.
Troubleshoot AWS Lambda failures caused by IAM, VPC networking, environment variables, timeouts, memory, and code errors.
Use a repeatable AWS troubleshooting workflow with CloudWatch, CloudTrail, VPC Flow Logs, AWS Config, and Systems Manager.
Monitor AWS service quotas, plan capacity early, and submit clear quota increase requests before throttling affects production.
Diagnose EC2 connectivity by checking route tables, stateless network ACLs, and stateful security groups in the right order.
Debug Bash script failures by checking exit codes, tracing commands, isolating environment issues, and logging unattended runs.
Improve Bash error handling with strict mode, explicit checks, cleanup traps, clear exit codes, and stderr logging.
Bash scripts often fail due to subtle variable expansion errors. This comprehensive guide dissects common issues like incorrect quoting, handling uninitialized values, and managing variable scope within subshells and functions. Learn essential debugging techniques (`set -u`, `set -x`) and master powerful parameter expansion modifiers (like `${VAR:-default}`) to write robust, predictable, and error-proof automation scripts. Stop debugging mysterious empty strings and start scripting confidently.
Fix common Bash syntax errors with examples for quotes, brackets, variables, redirects, and command lookup problems.
Debug Bash scripts with syntax checks, xtrace, strict mode, traps, ShellCheck, and focused logging.
Resolve frustrating SSH connection issues caused by port conflicts. This guide details how to definitively identify the active SSH port using system commands (`ss`/`netstat`) and provides a step-by-step, safe methodology for modifying the configuration file (`sshd_config`) and updating firewalls to switch to a new port number, preventing lockouts.
Fix SSH authentication failures with verbose client logs, server logs, permission checks, key validation, and sshd settings.