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From: Paul Brindusa <paulbrindusa88@gmail.com>
Date: Tue, 28 Jan 2025 13:40:42 +0000
Message-ID: <CAFeSbqjqi1DZjQDatiZehk3GpkX_dFv=qgfsgWxKbsACSWJv_g@mail.gmail.com>
Subject: Re: Log retention query
To: Laurenz Albe <laurenz.albe@cybertec.at>
Cc: pgsql-general <pgsql-general@postgresql.org>
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@Junwang apologies, I should have mentioned that  we've tried setting up a
crontab and it has not worked. Have you got something similar working?

@Laurenz: log_filename: postgresql-%Y-%m-%d.log  -- if we redo the syntax
can we make it trigger garbage collection on 180 days?

On Tue, Jan 28, 2025 at 1:28=E2=80=AFPM Laurenz Albe <laurenz.albe@cybertec=
.at>
wrote:

> On Tue, 2025-01-28 at 09:57 +0000, Paul Brindusa wrote:
> > Good morning everyone,
> >
> > Before I get on with today's problem, I would like to say how much I
> appreciate this community and everything that you do for end users.
> >
> > In today's problem I would like to understand if the following lines in
> our config handle the log rotation for our clusters?
> >
> >         log_checkpoints: on
> >         logging_collector: on
> >         log_truncate_on_rotation: on
> >         log_rotation_age: 1d
> >         log_rotation_size: 1GB
> >         log_error_verbosity: verbose
> >
> > I have been deleting the logs manually for the last month, since I am
> confused how the log collector rotates them.
> >
> > Am looking to delete logs older than 180 days. What are we doing wrong
> in the config?
>
> It all depends on how you configured "log_filename".
>
> If the setting is "postgresql-%a.log" or "postgresql-%d.log", PostgreSQL
> will recycle the old log files once a week or once a month.
>
> If the setting is the default "postgresql-%Y-%m-%d_%H%M%S.log", the same
> log file name will never be reused, and there will be no log rotation.
>
> PostgreSQL doesn't actively delete old log files.
>
> Yours,
> Laurenz Albe
>


--=20
Kind Regards,
Paul Brindusa
paulbrindusa88@gmail.com

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<div dir=3D"ltr">@Junwang apologies, I should have mentioned that=C2=A0 we&=
#39;ve tried setting up a crontab and it has not worked. Have you got somet=
hing similar working?<br><div><br></div><div>@Laurenz: log_filename: postgr=
esql-%Y-%m-%d.log=C2=A0 -- if we redo the syntax can we make it trigger gar=
bage collection on 180 days?<br></div></div><br><div class=3D"gmail_quote g=
mail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jan 28,=
 2025 at 1:28=E2=80=AFPM Laurenz Albe &lt;<a href=3D"mailto:laurenz.albe@cy=
bertec.at">laurenz.albe@cybertec.at</a>&gt; wrote:<br></div><blockquote cla=
ss=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex">On Tue, 2025-01-28 at 09:57 +0000, Paul =
Brindusa wrote:<br>
&gt; Good morning everyone,<br>
&gt; <br>
&gt; Before I get on with today&#39;s problem, I would like to say how much=
 I appreciate this community and everything that you do for end users.<br>
&gt; <br>
&gt; In today&#39;s problem I would like to understand if the following lin=
es in our config handle the log rotation for our clusters?<br>
&gt; <br>
&gt; =C2=A0 =C2=A0 =C2=A0 =C2=A0 log_checkpoints: on<br>
&gt; =C2=A0 =C2=A0 =C2=A0 =C2=A0 logging_collector: on<br>
&gt; =C2=A0 =C2=A0 =C2=A0 =C2=A0 log_truncate_on_rotation: on<br>
&gt; =C2=A0 =C2=A0 =C2=A0 =C2=A0 log_rotation_age: 1d<br>
&gt; =C2=A0 =C2=A0 =C2=A0 =C2=A0 log_rotation_size: 1GB<br>
&gt; =C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error_verbosity: verbose<br>
&gt; <br>
&gt; I have been deleting the logs manually for the last month, since I am =
confused how the log collector rotates them.=C2=A0<br>
&gt; <br>
&gt; Am looking to delete logs older than 180 days. What are we doing=C2=A0=
wrong in the config?<br>
<br>
It all depends on how you configured &quot;log_filename&quot;.<br>
<br>
If the setting is &quot;postgresql-%a.log&quot; or &quot;postgresql-%d.log&=
quot;, PostgreSQL<br>
will recycle the old log files once a week or once a month.<br>
<br>
If the setting is the default &quot;postgresql-%Y-%m-%d_%H%M%S.log&quot;, t=
he same<br>
log file name will never be reused, and there will be no log rotation.<br>
<br>
PostgreSQL doesn&#39;t actively delete old log files.<br>
<br>
Yours,<br>
Laurenz Albe<br>
</blockquote></div><div><br clear=3D"all"></div><div><br></div><span class=
=3D"gmail_signature_prefix">-- </span><br><div dir=3D"ltr" class=3D"gmail_s=
ignature"><div dir=3D"ltr"><div>Kind Regards,</div><div>Paul Brindusa</div>=
<div><a href=3D"mailto:paulbrindusa88@gmail.com" target=3D"_blank">paulbrin=
dusa88@gmail.com</a></div><div><br></div></div></div>

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