Re: BUG #19002: `pg_isready` unexpectedly succeeds on incorrect `--dbname` and/or `--username`

Hmm I suppose that works, but really I was using it as a "can i connect"
check. Similar to https://github.com/eficode/wait-for or
https://github.com/wait4x/wait4x

It seems weird—unexpected to user—to accept dbname or user and not have a
non-zero exit code or something in stderr indicating failure…

Samuel Marks
Charity <https://sydneyscientific.org> | consultancy <https://offscale.io>
| open-source <https://github.com/offscale> | LinkedIn
<https://linkedin.com/in/samuelmarks>

On Tue, Jul 29, 2025 at 2:54 PM Jacob Champion <
jacob(dot)champion(at)enterprisedb(dot)com> wrote:

> On Tue, Jul 29, 2025 at 12:45 PM PG Bug reporting form
> <noreply(at)postgresql(dot)org> wrote:
> > / > pg_isready -U fff
> > /tmp:5432 - accepting connections
> > / > pg_isready -U fff -d555
> > /tmp:5432 - accepting connections
> > ```
> >
> > (`fff` is not a user and `555` is not a db on my installation)
>
> Hi Samuel, this behavior is explained in the docs [1]:
>
> > It is not necessary to supply correct user name, password, or database
> name values to obtain the server status; however, if incorrect values are
> provided, the server will log a failed connection attempt.
>
> So it's essentially just a courtesy to whoever's watching your logs.
>
> --Jacob
>
> [1]
> https://www.postgresql.org/docs/current/app-pg-isready.html#APP-PG-ISREADY-NOTES
>