ops

2 posts

Sep 08, 2026

The cover that wouldn't change — immutable cache and the fix that was renaming the file

The cover was remade twice, the deployment served the new bytes — and the blog kept showing the old image. The culprit wasn't the build or the CDN: it was a header promising the file would never change for a year. The story of the hunt, the math of immutable caching, and the rule that stuck: reworking an asset requires a new URL.

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descobertas cache covers

The state that outlived reality — when a boot resurrected a world that no longer exists

Descobertas

Sep 05, 2026

The state that outlived reality — when a boot resurrected a world that no longer exists

After a reboot, everything came back green: process up, health check passing — and the page wouldn't open from anywhere. The service had resurrected with instructions from a past life, frozen in a state file, while the world outside had moved. This post covers the hunt, the fix at the source (stale state dies on every start, address defined in exactly one place) and the second half of the story: a network announcement that only talked to an interface with a fixed name, on the day the system renamed it.

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descobertas state boot

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The cover that wouldn't change — immutable cache and the fix that was renaming the file

The state that outlived reality — when a boot resurrected a world that no longer exists