PinnedhdhoanginCoccoc Engineering BlogMythical 0-link, readable file and other wonkeriesHere are some unassorted strangeness we encountered recently, while using k8s/containers on linux.7 min read·Sep 13, 2023----
hdhoanginCoccoc Engineering BlogHave you seen DNS TYPE0 CLASS256?we started seeing messages like this in unbound.log, with weird CLASS256 queries5 min read·Jan 19, 2023----
hdhoanginCoccoc Engineering Blogconcrete reproduction checks my thinkingI almost reported an issue, right up to the point where bisecting doesn’t reproduce it reliably.2 min read·Aug 21, 2022----
hdhoanginCoccoc Engineering Blogpodman encountered selinux (it’s somewhat effective!)5 min read·Jan 28, 2022----
hdhoanginCoccoc Engineering BlogQuick words on VectorToday’s a quick introduction to Timber Vector, a multi-purpose metrics&log routing tool4 min read·Dec 29, 2021----
hdhoanginCoccoc Engineering Blogpsmisc 23.2 killall doesn’t match long process nameslet’s use more fool-proof methods2 min read·Aug 4, 2021----
hdhoangKludging AAAA for a tailnetTailscale is great. Avery Pennarun asked for questions. Here’s my question: can we get more details on IPv6 for peers in the KB, please?2 min read·Jul 26, 2021----
hdhoangPSA: these DNS servers return bogus A for non-existent namesA honest resolver would say NXDOMAIN for nx.example.net:1 min read·Jun 30, 2021----
hdhoanginCoccoc Engineering BlogKafka under page fault pressureThere are times to talk about failures. You can take away some reference links from our investigation so far:4 min read·Jun 30, 2021----
hdhoanginCoccoc Engineering BlogAn nginx mis-ssl storyan issue we met with nginx, due to using old and deprecated ssl config directive3 min read·Mar 31, 2021----