My automated Daily Health Report infrastructure
Back in the days when the Zero COVID policy was prevailing, our university introduced a Daily Health Report system. Students and faculty were mandated to submit a daily online form detailing their ...
Overengineering Advent of Code 2022
Advent of Code (Wikipedia, link) is an annual event that releases a programming puzzle every day from December 1 to December 25. It’s a great chance to learn a new language or practice your skills.
Recovering a Minecraft world from a crash, the technician way
While a friend was building an automatic brewing pipeline, our Create: Astral server crashed and wouldn’t start again. At first we thought it’d be easy to restore our world from a backup, only to f...
Paper Reading: Are You Sure You Want to Use MMAP in Your Database Management System?
Paper reading for [CIDR 2022] Are You Sure You Want to Use MMAP in Your Database Management System? by Crotty et al.
LVM metadata exceeds maximum metadata size, now what next?
An LVM volume group (VG) on our Proxmox VE cluster has failed to create new logical volumes, reporting that its metadata was full. At first this appears to be easy, “fine I’ll just add more space f...
Taking the 24 puzzle game to the next level
The 24 game is a classic math game where players try to arrange 4 integers into 24 using basic arithmetics (addition, subtraction, multiplication and division). Thanks to its popularity, it’s now a...
Centralized Linux authentication with OpenLDAP
LDAP, the #1 way to get your graduation delayed (as has always been the meme around Tsinghua University), is every SysAdmin’s dream tool for their servers. As mighty as its rumors fly, LDAP takes t...
Install Proxmox VE on eMMC
Recently I bought a mini PC looking forward to setting up a home router. It started quite well except the specs were higher than I anticipated. 8 GB RAM plus 128 GB eMMC - too much waste for “just ...