Short write-ups on infrastructure, networking and small systems — things I had to figure out the hard way.
Why a single TCP flow tops out long before the link is saturated, and what actually moves the needle.
nginx, cache headers and a 4-line deploy script. Sometimes the boring answer wins.
Backup strategy, WAL settings and the two knobs that matter for a small workload.
A quick tour of the entries that are actually useful when a box is misbehaving.
ETag, revalidation, and the surprising number of edge cases around Vary.
What it is, how it is built, and why it looks like this.