Singals are ignored, breaking monitoring systems #50
Description
Monitoring exporters, like this one: https://github.com/cafebazaar/keepalived-exporter rely on being able to send signal to docker container in order for keepalived to dump its stats/data files.
Because in this image the PID1 is merely a startup process (it doesn't exec keepalived), it is the one that receives the signals. It ignores those signals completely, causing it to fail. I believe fixing it might require allowing containers to register custom signal handlers here: https://github.com/osixia/docker-light-baseimage/blob/master/image/tool/run#L892-L894
TL;DR:
I'd expect running docker kill -s 12 keepalived to cause it to create /tmp/keepalived.stats.