Why docker sends SIGKILL after 10 seconds ? #45101

Fomys · 2023-03-04T23:54:18Z

Fomys
Mar 4, 2023

Hello,
This may be a stupid question, but I can't find the answer anywhere.
Why does docker stop send SIGKILL after 10 seconds?

Because when I do a docker stop I expect docker to pass a SIGTERM signal to the process and wait for it to finish. In particular, docker should wait for the process to finish running to allow a proper data save. Because of this illogical behavior, I just lost an hour's worth of data because docker didn't give the process time to save properly (yes, I have slow storage, but 10 seconds is very short...).
This doesn't really make sense to me, especially since there is also the docker kill command which is designed to force the process to terminate.

I found a way to stop this from happening to me by setting a very long stop_grace_period on this particular docker (https://docs.docker.com/compose/compose-file/#stop_grace_period), but is there any way to configure docker globally so that it never sends this SIGKILL?

Thank you very much

Answered by cpuguy83

Mar 20, 2023

docker stop stops the container. It does so by passing along the configured termination signal and if it doesn't stop it forces it to.
In terms of "why"? I'm not sure I or likely anyone can give you the real answer here, it's been that way probably since it was first created... certainly since I started using docker pre-1.0 and works very well most of the time.
You can pass -t -1 to make it wait indefinitely or specific some other longer timeout.

Also worth noting docker kill just sends a signal to the container, and defaults to SIGKILL.
You could use docker kill -s SIGTERM && docker wait as well.

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cpuguy83 · 2023-03-20T19:31:30Z

cpuguy83
Mar 20, 2023
Maintainer

docker stop stops the container. It does so by passing along the configured termination signal and if it doesn't stop it forces it to.
In terms of "why"? I'm not sure I or likely anyone can give you the real answer here, it's been that way probably since it was first created... certainly since I started using docker pre-1.0 and works very well most of the time.
You can pass -t -1 to make it wait indefinitely or specific some other longer timeout.

Also worth noting docker kill just sends a signal to the container, and defaults to SIGKILL.
You could use docker kill -s SIGTERM && docker wait as well.

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Why docker sends SIGKILL after 10 seconds ? #45101

Fomys Mar 4, 2023

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cpuguy83 Mar 20, 2023 Maintainer

Fomys
Mar 4, 2023

cpuguy83
Mar 20, 2023
Maintainer