Graceful shutdown not supported

[ghost]

Description

In case of deployments that need to support zero-downtime, the support of graceful shutdown methods is essential, so that in-process requests can finish processing while new requests are being rejected.

Major runtime environments have settled for using SIGTERM as the default signal for a graceful shutdown:

• docker stop
• Kubernetes - Termination of Pods

Although pm2 uses SIGINT by default, that also does not seem to be supported by many services.

Steps to reproduce

1. start a Docker container or the intended local server process of an affected service
2. send signal TERM to the process

Expected result

Server process shuts down gracefully with with exit code 0.

Actual result

Nothing happens. Server process keeps running.

Environment

not applicable

┆Issue is synchronized with this Jira Task
┆Issue Number: FXA-2273

[ghost]

At least the following services currently do not support SIGTERM:

• fxa-auth-server
• fxa-customs-server
• fxa-email-service

[jodyheavener]

Looks like this closed in #5938

[ghost]

@jodyheavener
Actually, at least the email-service still doesn't support this, but that seems to be a longer story with Rocket:

• Clean shutdown? rwf2/Rocket#180

Also, I didn't check all services, e.g. admin/support/payment. But for those, separate PR's would be better than to keep issues open for too long.

[jodyheavener]

Ah, ok noted. Thanks for the heads up.

[ghost]

Finally looked through all services and I think #5961 is now ready for review.