Reno Bladergroen <reno.bladergr...@telenet.be> writes:
> I have two xubuntu logins: a "superuser" and postgres. The latter one is a 
> user with basic privileges.
> I installed pgsql according to the manual, generated a data folder, changed 
> ownership to postgres, switched user postgres and initialized the database. 
> starting the database is also successful (status says running).
> But now: when I use the command createdb test, I get the error "can't connect 
> to database postgres: could not connect to server: no such file or directory, 
> Is the server running locally and accepting .... etc."
> When I switch user back to "superuser" I can start the server, add users etc. 
> in pgAdmin3. But I need to be able to do this from the command line.

Stop the postmaster so that createdb fails for both logins, and compare
the error messages --- are they pointing to the same socket file?  I
suspect JD's diagnosis is right: you probably have got two postgres
installations (or parts of two at least) with different ideas of where
the communication socket should be.

> When I reboot, the database is not automatically started.

"man chkconfig" might help you with this one.  Linux systems are not
normally made to auto-start services unless they're very specifically
requested.

By and large, it's a lot less painful to use a preconfigured package
than to try to install from source.

                        regards, tom lane

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