ignore sigterm #14
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ignore sigterm #14
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It looks like CI has bitrotted :( |
tcrayford
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Aug 19, 2019
This rewrites `start-l2met-shuttle`, and uses a binary from heroku/l2met-shuttle#14 that ignores `SIGTERM` This is because, on heroku dynos, the dyno manager sends SIGTERM to every process when doing a graceful shutdown. During that time period, we still want logging to happen and metrics to be sent. With the prior implementation, the `tee` processes would exit the moment the dyno got told to shutdown. In the new implementation, `l2met-shuttle` hangs around until the process it's reading from dies.
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beanieboi
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Aug 20, 2019
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@tt Is the |
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Let's pick that work up sometime @edmorley ;) |
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For folks reading this later, there's a slack discussion on this here: https://heroku.slack.com/archives/CA5BNBLDR/p1566300448040700 |
tcrayford
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Aug 23, 2019
This rewrites `start-l2met-shuttle`, and uses a binary from heroku/l2met-shuttle#14 that ignores `SIGTERM` This is because, on heroku dynos, the dyno manager sends SIGTERM to every process when doing a graceful shutdown. During that time period, we still want logging to happen and metrics to be sent. With the prior implementation, the `tee` processes would exit the moment the dyno got told to shutdown. In the new implementation, `l2met-shuttle` hangs around until the process it's reading from dies.
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This sets the
l2met-shuttleprogram to ignoreSIGTERMentirely.This is because, on heroku dynos, the dyno manager sends
SIGTERMto every process when doing a graceful shutdown. During that time period, we still want logging to happen and metrics to be sent.The prior implementation of
l2met-shuttleleads to all logs going missing the moment a dyno starts shutting down, and usually that will crash the "main" processl2met-shuttleis a sidecar for.