New technical explainers, certification perspectives and practical ideas.
Large Spark workloads become slow for many different reasons: unnecessary data scans, poor join strategy, skew, shuffle, small files, oversized partitions, driver overload,…
Read articleData observability answers a different question from infrastructure monitoring. Instead of asking only whether compute is running, it asks whether data arrived, changed…
Read articleProduction data pipelines are judged by repeatability, recovery, observability, security, and cost—not by whether a notebook succeeded once with sample data. Databricks provides…
Read articleChange data capture is the point where a lakehouse stops behaving like a sequence of full reloads and starts behaving like a continuously…
Read articleService management on Red Hat Enterprise Linux is built around systemd units, dependencies, targets, the journal, and persistent enablement. The commands are easy…
Read articleRed Hat Enterprise Linux boot failures are rarely solved by memorizing one rescue command. A reliable administrator works from the boot path outward:…
Read articleSELinux is often blamed when a service fails after a configuration change because it can deny an action that ordinary Unix permissions allow.…
Read articleUser and group administration is one of the foundations of RHEL security. Local accounts determine who can log in, file ownership controls what…
Read articleLogical Volume Manager gives RHEL administrators a flexible layer between physical block devices and filesystems. Instead of treating every disk partition as a…
Read articleRed Hat Enterprise Linux uses firewalld as the standard high-level firewall management service in many installations. For administrators, the important skill is not…
Read articleContainer security begins long before a Pod starts. Source code, dependencies, build runners, base images, registries, signing keys, CI credentials, and deployment policy…
Read articleKubernetes Secrets provide a native way to pass confidential configuration such as passwords, tokens, keys, and certificates to workloads, but a Secret object…
Read articleKubernetes security does not end when an image passes a registry scan and a Pod is admitted. Once a container is running, the…
Read articleKubernetes makes it easy for applications to discover and reach one another, but default connectivity is often broader than a security-conscious production design…
Read articleKubernetes does not make an application safe merely because it runs inside a container. Containers share the node kernel, and a poorly constrained…
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