A health check yana gaya wa Docker (ko wani ma'aikaci) yadda za a gane ko aikace-aikacen container ya yi aiki gaske, ba kawai yana gudu ba. Tsarin container zai iya kasua dalilin cewa aikace-aikace ya karye (ya dakata, ba zai iya rikowa batakin data ba) — health checks suna gano haka don haka platform ta iya aiki.
Siffanta health check
# in a Dockerfile
HEALTHCHECK --interval=30s --timeout=3s --retries=3 \
CMD curl -f http://localhost:3000/health || exit 1
# → Docker runs this command periodically; exit 0 = healthy, non-zero = unhealthy
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