OBSERVE / UNDERSTAND / OPERATE
Small systems.
Clearer decisions.
Field notes on Linux, networks and the work of keeping a small server dependable. Start with evidence. Leave a path back.
01 / THE NOTEBOOK12 practical articles · 8 local tools
Start with the system
All articles →01
Linux
02A small server needs a baseline
Record enough context to distinguish a system problem from an application symptom.
Networking
03Reading TCP under load
Use congestion, flow control and application demand as separate explanations.
Performance
04BBR, buffers and the delay budget
Why a larger buffer and a faster congestion controller are different decisions.
Protocols
QUIC is more than UDP
Understand the layers before interpreting an HTTP/3 or tunnel trace.
WHY THIS EXISTS
Keep the explanation
as close as the command.
There is usually a smaller question hiding inside a large incident. These notes connect the command, the observation and the next decision.
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