Tom Lane wrote:
> "Marc G. Fournier" <scrappy@postgresql.org> writes:
>> Then again, in the case of pg_upgrade, wouldn't just disabling access from
>> anywhere except localhost prevent others from getting in?
>
> Not if your normal operating mode includes connections from clients
> running locally. I really don't see any clean way to ensure that
> pg_upgrade (and subsidiary pg_dump runs invoked by it) are the only
> ones allowed to connect to the database, if we keep the normal
> postmaster running. But if we shut down the postmaster then it's
> trivial.
If you want to prevent "accidential" access, start postmaster on a
non-standard port.
Jan
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