Gracegul shutdown does not work when deleting pods of screwdriver component.

[sakka2]

What happened:
The process of server shutdown is implemented here, but it does not seem to perform actually during the server shutdown.
This may because that the application is not correctly catching the SIGTERM signal when the server is shutting down.

One possible reason is that the SIGTERM signals do not reach the actual node process if the application is executed in the order npm start -> node index.js. Especially, this problem seems to happen mainly with dockerized application.

Refer the link below:

• https://blog.risingstack.com/graceful-shutdown-node-js-kubernetes/
• [BUG] npm not handling process signals npm/cli#6684
• https://github.com/nodejs/docker-node/blob/main/docs/BestPractices.md#handling-kernel-signals

What you expected to happen:
Node processes for each component properly catch SIGTERM signals and perform graceful shutdown.

How to reproduce it:
Delete or restart screwdriver.cd components on kubernetes.

[VonnyJap]

@kumada626 - are you aware if the works to address this issue have been completed? If yes, then we should close the issue accordingly. Thank you!

[kumada626]

@VonnyJap We think some additional modifications are needed to address this comment from PR.
So a little more we will continue to work on this Issue.