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From: Torsten Krah <krah.tm@gmail.com>
To: pgsql-general@lists.postgresql.org
Subject: Re: untracked child process (PID XXXXX) exited with exit code 120
Date: Thu, 07 May 2026 22:15:23 +0200
Message-ID: <c2fff6388d6634531d025c5af7f88779138792b9.camel@gmail.com> (raw)
In-Reply-To: <CAFh8B=n57ZPGPAewHNmQ093DcY-+Nr_LQiY4W7-4RfXYoz5-XA@mail.gmail.com>
References: <2e556bbdbe6ccac93ecb6cfbb5a815059ff5aad2.camel@gmail.com>
	<CAFh8B=n57ZPGPAewHNmQ093DcY-+Nr_LQiY4W7-4RfXYoz5-XA@mail.gmail.com>

Am Donnerstag, dem 07.05.2026 um 19:51 +0200 schrieb Alexander
Kukushkin:
> My guess would be that the postmaster in your container is running
> with
> PID=1.
> The unexpected process was probably started by docker entrypoint
> before it
> did exec postgres [...].
> As a result, this subprocess became a direct child of the postmaster
> and we
> got the problem.
> 
> The most common solution is to avoid running postmaster with PID=1.
> There are two options available:
> 1. dumb-init
> 2. start container using "docker run --init [...]"

My /docker-entrypoint-initdb.d is empty and I did not customize the
default entrypoint or command to run (there was a ready to use data dir
/ volume, so it just skipped initialization on start), so I am not sure
what else should have been started, but I know, just guesswork here.

Between starting the pod initially:

16:52:28.317

and the time the untracked process did fail:

18:39:13.947

nearly 2 hours passed, ah too bad I will never know what PID 120 was.

Yes, the postgres image postgres:18-trixie does run the postgres
process with PID=1:

postgres       1  0.0  0.2 4443124 139360 ?      Ss   May06   0:27 postgres


Using kubernetes as runtime, there is no "--init" option and e.g. tini
is not in the image - if is is a problem running postgres with pid=1,
could e.g. tini be added to the image (if so, do you know where to
address this?) and used as default entrypoint (I know I can build one
myself and extend that image to provide tini, but I would prefer just
to use the upstream image as-is)?

kind regards

Torsten

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