November 3, 2025
Use Kafka CLI commands to check topic replication, consumer lag, broker API status, and basic cluster health during incidents.
Learn how to create, list, describe, alter, and delete Kafka topics with kafka-topics.sh from the command line.
Compare mysqldump and SELECT INTO OUTFILE for MySQL backups, migrations, CSV exports, permissions, and server-side file limits.
Learn how to use MySQL USE and DESCRIBE safely when switching databases and inspecting table schemas.
Master real-time MySQL performance monitoring using two essential commands: SHOW STATUS and SHOW PROCESSLIST. Learn how to interpret global performance counters, identify active connections, spot long-running or blocking queries, and diagnose resource bottlenecks immediately. This guide provides practical examples for analyzing thread activity, InnoDB metrics, and executing targeted actions like KILL.
Use MySQL GRANT, REVOKE, SHOW GRANTS, and DROP USER safely with least-privilege examples for app and admin accounts.
Learn the core MySQL DDL and DML commands: CREATE TABLE, INSERT, SELECT, UPDATE, and DELETE.
Filter kubectl get output with label selectors, JSONPath, and custom columns for cleaner Kubernetes troubleshooting.
Understand when to use kubectl apply, set, and edit without creating drift between live Kubernetes objects and Git.
Troubleshoot Kubernetes connectivity and internal application issues with confidence. This guide provides practical examples of using `kubectl exec` to run commands inside containers and `kubectl port-forward` to securely access services from your local machine. Learn how to diagnose network problems, inspect configurations, and gain deep insights into your application's behavior within the cluster.
Manage multiple Kubernetes clusters with kubectl contexts, kubeconfig files, namespaces, and safer switching commands.
This guide provides expert techniques for mastering the essential Kubernetes debugging commands: `kubectl logs` and `kubectl describe`. Learn the critical flags, such as `-f`, `--tail`, `-c`, and `--previous`, required for efficient troubleshooting. We detail how to interpret the crucial 'Events' section in `describe` to diagnose scheduling and configuration issues, and how to use `logs` to extract runtime errors from crashing or multi-container pods, accelerating your debugging workflow.