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…penbsd nc -z is purpose-built for TCP port checks — no exit code quirks, and netcat-openbsd is ~80KB vs the ~8MB curlimages/curl base image.
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Summary
nc -zis purpose-built for TCP port checks — intent is immediately obvious, no curl exit code quirks to reason about (ETL-1211)netcat-openbsdis ~80KB vscurlimages/curlat ~8MB — significantly smaller imageChanges
Dockerfile: switch base fromcurlimages/curl:latesttoalpine:3.20, installnetcat-openbsdREADME.md: update usage example from curl one-liner tonc -z <host> <port>Test plan
docker build -t wait-probe:test .docker run --rm wait-probe:test sh -c 'nc -z google.com 443 && echo ok'docker run --rm wait-probe:test id→uid=100Rollback
Revert PR — no data writes or migrations.