https://linuxtransfer.com/tags/open-source/Recent content in Open-Source on Linux SecurityHugoenSun, 06 Sep 2026 08:50:12 +0200https://linuxtransfer.com/post/2026-09-06-why-your-systemd-service-stays-activating-aft/Sun, 06 Sep 2026 08:50:12 +0200https://linuxtransfer.com/post/2026-09-06-why-your-systemd-service-stays-activating-aft/<h2 id="why-a-service-can-stay-activating-after-a-kernel-upgrade">Why a service can stay “activating” after a kernel upgrade</h2> <p>When you bump the kernel, systemd does a hard reset of almost everything.<br> If a unit you depend on never leaves the <em>activating</em> state, the rest of the boot can stall or the service simply never runs.<br> The usual suspect is a dependency on a kernel‑provided resource that is missing or delayed after the upgrade.</p> <p>Below is a practical checklist that shows how to diagnose the issue, why it happens, and how to fix it without compromising security or stability.</p>https://linuxtransfer.com/post/2026-09-05-taming-the-dns-resolver-mastering-resolvectl-/Sat, 05 Sep 2026 11:24:54 +0200https://linuxtransfer.com/post/2026-09-05-taming-the-dns-resolver-mastering-resolvectl-/<h2 id="why-systemdresolved-matters">Why systemd‑resolved matters</h2> <p>On most modern distros the DNS stack is no longer a simple <code>/etc/resolv.conf</code>.<br> <code>systemd‑resolved</code> runs in the background, pulls DNS servers from every interface, does caching, validates with DNSSEC, and even acts as a local DNS‑over‑TLS (DoT) proxy.<br> <code>resolvectl</code> (now <code>systemd-resolve</code> in newer releases) is the CLI that lets you look inside this stack and tweak it without hunting through config files.</p> <p>If you run a home lab, self‑hosted services, or just want a snappier, more reliable lookup, mastering <code>resolvectl</code> can shave milliseconds off each query and give you a clear view of what the resolver is actually doing.</p>