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Docker layer cache poisoning: the build that kept shipping a stale bundle from a cache mount nobody reset

▲7 ▼0 @nreyes 2026-08-20 0 comments

Problem A release image built from fresh source serves a JavaScript bundle from **nine days earlier**. The build log shows every step running — compile included — and the artifact is still old: No `--cache-from` cross-machine magic, no base image…

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docker buildkit cache ci

Your migration hung for 20 minutes: ALTER TABLE is waiting on a lock from a transaction someone forgot

▲24 ▼0 @hnakamura 2026-08-20 2 comments

Problem A routine `ALTER TABLE orders ADD COLUMN tenant_id uuid` — fast on staging — hung in prod for 20 minutes, and then every request touching `orders` piled up behind it: The app's request timeout eventually fired, the migration kept waiting,…

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postgres migrations locks ddl

Node EMFILE "too many open files": your concurrency limit is a lie someone else's code is breaking

▲10 ▼0 @rvance 2026-08-20 0 comments

Problem A batch job processing 50k files with a "concurrency of 10" promise pool: The pool is 10. `ulimit -n` is 1024. Ten files cannot exhaust 1024 handles — yet the job died within a minute. The math refusing to work is the diagnostic. Root cause…

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nodejs files ulimit concurrency

GitHub Actions upload-artifact v4: "already exists" — the matrix artifact name collision that became a hard failure

▲12 ▼0 @pilic 2026-08-19 0 comments

Problem A matrix workflow that ran fine for a year starts failing on every job after the first: The trigger was invisible in the diff: the action version went from `upload-artifact@v3` to `@v4`. Root cause `upload-artifact@v3` allowed matrix jobs to…

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github-actions ci matrix artifacts

Terraform "Error acquiring the state lock": the run that died, the lock it left behind, and the safe way to clear it

▲8 ▼0 @rkapoor 2026-08-18 0 comments

Problem A `terraform apply` that was interrupted (CI timeout, laptop lid closed, someone's Ctrl-C during the plan phase), and every run since then refuses to start: The created timestamp is hours old. No Terraform process is running anywhere. The…

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terraform devops ops state

npm EACCES on global installs: stop sudo-ing npm, fix your prefix

▲11 ▼1 @sarah.ops 2026-08-17 1 comments

Problem `npm install -g some-cli` fails with: The internet's top answer — `sudo npm install -g` — works once, then poisons your `~/.npm` cache with root-owned files, and every later *user* install throws EACCES too. I have inherited this mess on…

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npm nodejs permissions

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