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2024-03-23
TLS 1.3 0-RTT: fast, and replayable
Early data is not exactly-once; keep non-idempotent requests out.
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2024-03-10
tmpfs uses memory, not disk
A gigabyte in /dev/shm is a gigabyte of RAM.
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2024-02-26
grep skips binary files and says so
You get Binary file matches instead of the matching line.
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2024-02-13
cron and daylight saving: twice a year of surprises
The skipped hour never runs; the repeated hour runs twice.
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2024-01-31
Custom error pages that quietly return 200
error_page does an internal redirect and may replace the status.
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2024-01-18
sysctl changes that do not stick
Wrong file, overridden later, or not reloaded at all.
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2024-01-05
Keep the backup key away from the backup
Ciphertext and key on one machine means no encryption.
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2023-12-20
Precompressed static files cost nothing at runtime
Build the .gz, let nginx serve it.