Propagate SIGTERM for graceful shutdown #110
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If the process receiving the signal is PID 1, it gets special treatment by the kernel; if it hasn't registered a handler for the signal, the kernel won't fall back to default behavior, and nothing happens. Prior to this patch, the entrypoint script is PID 1 in the container, and by default, shell does not register SIGTERM handler. As a result, `docker stop` will not work properly when trying to gracefully shutdown the container. This patch adds `tini` to be the PID 1 in the container to do PID 1 things, and correctly propagate the SIGTERM signal.
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Why not just update https://github.com/mintel/dex-k8s-authenticator/blob/master/entrypoint.sh#L9 to use: |
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@jimmidyson using exec is still not ideal. the go program might just assume using the default SIGTERM handler, which would kill itself if it's not PID1. But that behavior is not the case if it's running as PID 1. Plus, normally, a program won't do PID 1 things like reaping processes that reparented to it. |
jimmidyson
approved these changes
Oct 22, 2019
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Thanks both - bit of an oversight on my part to not use this originally. 👍 |
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If the process receiving the signal is PID 1, it gets special treatment
by the kernel; if it hasn't registered a handler for the signal, the
kernel won't fall back to default behavior, and nothing happens. Prior
to this patch, the entrypoint script is PID 1 in the container, and by
default, shell does not register SIGTERM handler. As a result,
docker stopwill not work properly when trying to gracefully shutdown thecontainer.
This patch adds
tinito be the PID 1 in the container to do PID 1things, and correctly propagate the SIGTERM signal.