Re: [GENERAL] Suddenly - LOG: could not open file "postmaster.pid":No such file or directory

On Fri, Jun 23, 2017 at 1:43 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Muhammad Hanif Abdul Hamid <hanif.hamid@mimos.my> writes:
>> Within this week, I have faced two times "postmaster.pid" went missing in a sudden. Nobody deleted it or shutdown
theserver. 
>
> I'd lay very long odds that your second statement is false.  *Something*
> removed that file, and it wasn't the postmaster.

Yup, and the postmaster is designed to stop if it finds out that
postmaster.pid is removed. See that:
commit: 7e2a18a9161fee7e67642863f72b51d77d3e996f
author: Tom Lane <tgl@sss.pgh.pa.us>
date: Tue, 6 Oct 2015 17:15:52 -0400
Perform an immediate shutdown if the postmaster.pid file is removed
--
Michael