Graceful Shutdown: Benefits and Reasons to Have It
There was a time when our team deployed a new version at 11 pm. After running kubectl rollout restart, 30 seconds later, PagerDuty alerted: 200 502 errors in 5 seconds. Customers were placing orders when they encountered a timeout. We quickly rolled back, then checked the logs - it turned out that the old pod was terminated with SIGTERM, the HTTP server shut down immediately, and 50 requests being processed were cut off entirely.
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