PG Bug reporting form <noreply(at)postgresql(dot)org> writes:
> On some servers, we began to encounter the "strange" behavior of
> postgresql.
> When shutting down the server at the command of UPS (shutdown now). The next
> time you turn on postgresql, it gets smart shutdown immediately at startup
Something is sending the server a SIGTERM signal. This is not a
Postgres bug, it's something else in your system doing something
it shouldn't.
regards, tom lane