Latest posts
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Tuning TCP buffers for long fat networks
Why the default kernel settings leave bandwidth on the table between data centers, and the three sysctl knobs that matter most.
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Zero-downtime certificate rotation with nginx
A small script, a deploy hook and a graceful reload: how I stopped worrying about expiring certificates.
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Moving my side projects from Compose to systemd units
Fewer moving parts, faster boots and logs in one place. What worked and what I would do differently.
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Reading flame graphs without losing your mind
A practical walkthrough of finding a CPU hotspot in a Go service using perf and pprof.
About
Hi, I'm Clara Lehto — a backend and infrastructure engineer living in Warsaw. I write here about things I had to figure out the hard way. More about me.