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Running nginx on a €7 box
Everyone reaches for a bigger instance out of habit. Nginx serving static files barely notices — the disk matters more than the RAM.
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What actually happens when a CDN caches your page
Watching a HIT turn into a MISS and back again taught me more about caching than any diagram ever did.
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Delegating DNS without breaking everything
Nameservers versus DNS records are two different screens at every registrar, and only one of them is the one you want.