0a22c159e5
Automatic merge from submit-queue (batch tested with PRs 62756, 63862, 61419, 64015, 64063). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Handle TERM signal to reduce pod terminating time. **What this PR does / why we need it**: Register signal handler for `TERM`. For container, process is run as PID 1. PID 1 is special in linux, it ignore any signal with the default action. So process will not terminate on `SIGINT` or `SIGTERM` unless it is coded to do so. By default, docker use `TERM` signal to termiante pods, it will wait 10 seconds before sending `KILL` signal. ``` $ docker run -d --rm --name test busybox sh -c 'while true; do sleep 1; done' aa827df5d7bfffc5ca4fae2429d0b761a5a142c57ba3e1faa59b305c92f1c875 $ time docker stop test test real 0m10.408s user 0m0.048s sys 0m0.020s ``` It's better to register a exit handler for `TERM`, it reduces a lot of time in waiting pods to termiante. ``` $ docker run -d --rm --name test busybox sh -c 'trap exit TERM; while true; do sleep 1; done' e331bff454dba8e45df6065c3bd2a928e1c41303aafdf88ede38def3e4e5781f $ time docker stop test test real 0m0.690s user 0m0.048s sys 0m0.020s ``` **Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: Fixes # **Special notes for your reviewer**: **Release note**: ```release-note NONE ```
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