--- title: "Uk K (@sachintech) | Hashnode" description: "Uk K (@sachintech) writes on Hashnode. Read their latest articles and follow their work." url: "https://hashnode.com/@sachintech" --- @sachintech # Uk K @sachintech · Delhi, India · Joined August 2026 ### [Diagnose Linux DNS Failures With getent, resolvectl and dig](https://tech-learning-sachin.hashnode.dev/diagnose-linux-dns-failures-with-getent-resolvectl-and-dig?utm_source=hashnode&utm_medium=feed) A Linux system can have a working network connection and still fail to reach a website by name. An application may report that a host cannot be resolved, a package manager may fail to contact a reposi 10 min read · [tech-learning-sachin.hashnode.dev](https://tech-learning-sachin.hashnode.dev/diagnose-linux-dns-failures-with-getent-resolvectl-and-dig?utm_source=hashnode&utm_medium=feed) [1](https://hashnode.com/posts/diagnose-linux-dns-failures-with-getent-resolvectl-and-dig/6aec31c4ee78ba2d608fec62) [Nov 5](https://hashnode.com/posts/diagnose-linux-dns-failures-with-getent-resolvectl-and-dig/6aec31c4ee78ba2d608fec62) ### [Learn Linux Troubleshooting Through a Practical, Step-by-Step Diagnostic Workflow](https://tech-learning-sachin.hashnode.dev/learn-linux-troubleshooting-through-a-practical-step-by-step-diagnostic-workflow?utm_source=hashnode&utm_medium=feed) Linux troubleshooting is an important skill for students, system administrators, developers and anyone who works with servers. A Linux system can run applications, manage files, process network reques 14 min read · [tech-learning-sachin.hashnode.dev](https://tech-learning-sachin.hashnode.dev/learn-linux-troubleshooting-through-a-practical-step-by-step-diagnostic-workflow?utm_source=hashnode&utm_medium=feed) [Nov 4](https://hashnode.com/posts/learn-linux-troubleshooting-through-a-practical-step-by-step-diagnostic-workflow/6aeae43cad3dfd82239e9f68) ### [Linux Disk Space and Inodes: Diagnose a Full Server Without Deleting the Wrong Files](https://tech-learning-sachin.hashnode.dev/linux-disk-space-and-inodes-diagnose-a-full-server-without-deleting-the-wrong-files?utm_source=hashnode&utm_medium=feed) A Linux server can stop working correctly when storage becomes full. Websites may fail to upload images, databases may refuse new writes and applications may be unable to create temporary files. A sys 9 min read · [tech-learning-sachin.hashnode.dev](https://tech-learning-sachin.hashnode.dev/linux-disk-space-and-inodes-diagnose-a-full-server-without-deleting-the-wrong-files?utm_source=hashnode&utm_medium=feed) [Nov 3](https://hashnode.com/posts/linux-disk-space-and-inodes-diagnose-a-full-server-without-deleting-the-wrong-files/6ae9817c0db0ade53e42f05a) ### [Deep Dive into Linux Kernel Performance Tuning: Optimizing System Limits with Sysctl and Perf](https://tech-learning-sachin.hashnode.dev/deep-dive-into-linux-kernel-performance-tuning-optimizing-system-limits-with-sysctl-and-perf?utm_source=hashnode&utm_medium=feed) The Linux kernel acts as the core intermediary between physical hardware components and user-space software applications. While standard Linux distributions provide balanced default configurations sui 4 min read · [tech-learning-sachin.hashnode.dev](https://tech-learning-sachin.hashnode.dev/deep-dive-into-linux-kernel-performance-tuning-optimizing-system-limits-with-sysctl-and-perf?utm_source=hashnode&utm_medium=feed) [Nov 2](https://hashnode.com/posts/deep-dive-into-linux-kernel-performance-tuning-optimizing-system-limits-with-sysctl-and-perf/6ae84147eef5e288d31ea4e4) ### [Use systemd Timers for Reliable Scheduled Tasks on Linux](https://tech-learning-sachin.hashnode.dev/use-systemd-timers-for-reliable-scheduled-tasks-on-linux?utm_source=hashnode&utm_medium=feed) Introduction Scheduled work is a normal part of Linux administration. Systems rotate logs, refresh data, run backups, clean temporary files, and perform health checks at regular intervals. Cron remain 11 min read · [tech-learning-sachin.hashnode.dev](https://tech-learning-sachin.hashnode.dev/use-systemd-timers-for-reliable-scheduled-tasks-on-linux?utm_source=hashnode&utm_medium=feed) [Oct 30](https://hashnode.com/posts/use-systemd-timers-for-reliable-scheduled-tasks-on-linux/6ae4582ecb764dc6b30b70af)