c43331d67a
* add preStop hook to trigger Fast Shutdown * disable readiness probe by default When Kubernetes terminates a pod, the container runtime typically sends a SIGTERM signal to pid 1 in each container [0]. PostgreSQL interprets SIGTERM as a request to do a "Smart Shutdown" [1]. This can take minutes (often exhausting the termination grace period), and during this time, new connections are not being serviced. Now that postgresql has a single replica, this behavior is undesirable. If we kill the pod (e.g. in an upgrade), we probably want it to come back as soon as possible. This change adds a preStop hook that sends a SIGINT to postgresql in order to trigger a "Fast Shutdown". In addition, the readiness probe is disabled by default, since it adds no value in a single-replica scenario. 0: https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/#pod-termination 1: https://www.postgresql.org/docs/9.6/server-shutdown.html Change-Id: Ib5f3d2a49e55332604c91f9a011e87d78947dbef |
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