kubernetes: how do we kill the pod?

[miekg]

CoreDNS needs SIGINT for the shutdown handlers to be called. I just implemented lameducking in the health middleware which will only work for SIGINT.

SIGTERM will just stop the process immediately.

[johnbelamaric]

Looks like k8s just sends a SIGTERM, no SIGINT:

ann-m-jbelamaric:coredns jbelamaric$ kubectl -n kube-system logs coredns-579f8497d5-6bxkp --follow
.:53
2018/01/11 19:24:46 [INFO] CoreDNS-1.0.0
2018/01/11 19:24:46 [INFO] linux/amd64, go1.9.1, a04eeb9c
CoreDNS-1.0.0
linux/amd64, go1.9.1, a04eeb9c
2018/01/11 19:26:19 [INFO] SIGTERM: Terminating process
ann-m-jbelamaric:coredns jbelamaric$

We could add a preStop hook that sends a SIGINT instead. https://kubernetes.io/docs/tasks/configure-pod-container/attach-handler-lifecycle-event/

[miekg]

[ Quoting <notifications@github.com> in "Re: [coredns/deployment] kubernetes..." ]

Looks like k8s just sends a SIGTERM, no SIGINT: ``` ann-m-jbelamaric:coredns jbelamaric$ kubectl -n kube-system logs coredns-579f8497d5-6bxkp --follow .:53 2018/01/11 19:24:46 [INFO] CoreDNS-1.0.0 2018/01/11 19:24:46 [INFO] linux/amd64, go1.9.1, a04eeb9c CoreDNS-1.0.0 linux/amd64, go1.9.1, a04eeb9c 2018/01/11 19:26:19 [INFO] SIGTERM: Terminating process ann-m-jbelamaric:coredns jbelamaric$ ``` We could add a preStop hook that sends a SIGINT instead. https://kubernetes.io/docs/tasks/configure-pod-container/attach-handler-lifecycle-event/

caddyserver/caddy#1993 /Miek

…

-- Miek Gieben