http://vadkerti.net/ Recent content on thrix's blog Hugo -- 0.152.2 en-us Fri, 17 Jul 2026 00:00:00 +0000 http://vadkerti.net/posts/the-dumb-git-protocol-that-flooded-our-git-server/ Fri, 17 Jul 2026 00:00:00 +0000 http://vadkerti.net/posts/the-dumb-git-protocol-that-flooded-our-git-server/ A CI clone spike pulled terabytes off an internal git server and caused an outage. The cause was one URL pointing at git’s dumb HTTP protocol, which makes every fresh clone re-fetch a repo object by object. http://vadkerti.net/posts/dns-negative-caching-broke-our-ephemeral-ci/ Tue, 30 Jun 2026 00:00:00 +0000 http://vadkerti.net/posts/dns-negative-caching-broke-our-ephemeral-ci/ A flaky CI failure where a freshly-created DNS record was unresolvable from inside the cluster, but resolved fine from my laptop a few minutes later. The culprit was negative DNS caching, driven by the zone’s SOA, poisoning lookups for our ephemeral per-job records. http://vadkerti.net/posts/reusable-home-manager-module-for-nix-on-silverblue/ Sat, 14 Mar 2026 00:00:00 +0000 http://vadkerti.net/posts/reusable-home-manager-module-for-nix-on-silverblue/ How I extracted a reusable Home Manager module that materializes Nix store symlinks as real files — so host-side programs on Fedora Silverblue can actually read them. http://vadkerti.net/posts/silencing-alerts-during-openshift-cluster-upgrades-with-prometheus-and-alertmanager/ Mon, 09 Mar 2026 00:00:00 +0000 http://vadkerti.net/posts/silencing-alerts-during-openshift-cluster-upgrades-with-prometheus-and-alertmanager/ How to detect OpenShift cluster upgrades, extend the detection window to cover the recovery period, and use Alertmanager inhibit rules to suppress noisy alerts during upgrades. http://vadkerti.net/posts/how-a-single-regex-stalled-30-testing-farm-jobs/ Fri, 06 Mar 2026 00:00:00 +0000 http://vadkerti.net/posts/how-a-single-regex-stalled-30-testing-farm-jobs/ Tracing stuck Testing Farm jobs from process list through Python stack traces to a catastrophic regex backtracking bug in tmt — caused by a 1M-character line in test output. http://vadkerti.net/posts/fixing-emoji-fonts-on-fedora-atomic/ Tue, 17 Feb 2026 00:00:00 +0000 http://vadkerti.net/posts/fixing-emoji-fonts-on-fedora-atomic/ How I debugged and fixed missing emoji rendering in Google Chrome on a BlueBuild/Fedora Atomic Desktops system — and why fontconfig wasn’t the answer. http://vadkerti.net/posts/hello-world/ Tue, 17 Feb 2026 00:00:00 +0000 http://vadkerti.net/posts/hello-world/ First post on the blog – who I am, why I started writing, and what to expect.