This guide compiles 100 practical kubectl commands covering cluster information, pod, service, deployment, storage, networking, security, scaling, and more, enabling you to diagnose and resolve Kubernetes issues quickly and confidently.
A five‑node Zookeeper cluster on version 3.4.6 experienced election‑port 3888 failures after normal restarts, traced to a NegativeArraySizeException caused by malformed packets from a security scan, and the issue is resolved by upgrading to Zookeeper 3.4.7.
This comprehensive guide presents 100 practical kubectl commands for diagnosing Kubernetes clusters, covering everything from cluster information and pod health checks to networking, storage, security, scaling, and advanced debugging tools, helping operators quickly identify and resolve issues.
This article walks through diagnosing a Kubernetes node2 cgroup leak caused by Ceph storage inconsistencies, detailing step‑by‑step investigations, Ceph and pod repairs, node maintenance commands, and reflections on preventing similar issues in future clusters.
This article examines a Kafka cluster failure where partition 34 could not elect a leader due to index file corruption, explains the underlying sanity‑check logic, reproduces the fault, and offers practical recovery steps and configuration recommendations to prevent data loss.
This article analyzes a TiDB cluster performance incident where QPS dropped and duration spiked due to write‑write conflicts, detailing the monitoring data, root‑cause investigation of server‑busy and scheduler latch issues, and the attempted mitigation steps such as enabling txn‑local‑latches and adjusting insert statements.
This article analyzes a TiDB production cluster outage caused by write‑write conflicts, walks through the monitoring data and log investigation, explains the underlying transaction model differences, and shares the step‑by‑step troubleshooting process that led to the final resolution.
