psql on Mac

Thank you, Andrej. I tried the instructions in this website. However, this
did not provide the desired outcome. I am pasting the command line
below.Also, the command "psql -h localhost" did not work.

XXX:src3 ozan$ psql -h localhost

Password:

psql: FATAL: password authentication failed for user "ozan"

XXX:src3 ozan$ psql -U postgres

psql (10.5)

Type "help" for help.

postgres=# CREATE USER ozan WITH PASSWORD 'parrot';

CREATE ROLE

postgres=# \q

XXX:src3 ozan$ psql

Password:

psql: FATAL: database "ozan" does not exist

XXX:src3 ozan$ psql -U postgres

psql (10.5)

Type "help" for help.

postgres=# GRANT ALL PRIVILEGES ON DATABASE lecture to ozan;

GRANT

postgres=# \q

Ozan's MacBookPro:src3 ozan$ psql

Password:

psql: FATAL: database "ozan" does not exist

^

On Tue, 23 Oct 2018 at 21:17, Andrej <andrej(dot)groups(at)gmail(dot)com> wrote:

> This is just a sneaky suspicion of mine, but have you actually created
> the user ozan?
> http://postgresguide.com/setup/users.html
> On Wed, 24 Oct 2018 at 04:58, Ozan Kahramanogullari <ozan(dot)kah(at)gmail(dot)com>
> wrote:
> >
> > Thanks, Jeff, for the explanation below. As you have pointed, I am
> moving the discussion to the novice list.
> >
> > Logging in as "postgres" works by using "-U". However, few other things
> are not clear; I apologise for the long message...
> >
> > If I want to run the "psql" for any user, for example, to create a
> database for the default user "ozan", this does not work.
> >
> > Now, I have added another line to my file "ph_hba.conf". The first three
> lines of this file look as follows (although I am not completely sure about
> the semantics this creates... My intuition is that everything should be
> accessible to everyone locally, but almost nothing actually is).
> >
> > local all all trust
> >
> > local postgres postgres trust
> >
> > local all postgres trust
> >
> > XXX:src3 ozan$ psql -U ozan
> >
> > Password for user ozan:
> >
> > psql: FATAL: password authentication failed for user "ozan"
> >
> >
> > XXX:src3 ozan$ psql lecture
> >
> > Password:
> >
> > psql: FATAL: password authentication failed for user "ozan"
> >
> >
> >
> > XXX:src3 ozan$ psql -U postgres lecture
> >
> > psql: FATAL: database "lecture" does not exist
> >
> >
> > This is on a Mac. The only thing that works is the following, which is
> fine for messing around with sql commands:
> >
> > psql -U postgres
> >
> > Now, to combine my exercise with python, I am setting an environment
> variable as follows:
> >
> > export DATABASE_URL="postgres://localhost:5432/lecture"
> >
> >
> > I am aware that I have NOT created a database called lecture, but this
> was not possible as well. However, I have created some database, and if I
> list it using the "-l" switch, I get the following.
> >
> > XXX:src3 ozan$ psql -U postgres -l
> >
> > List of databases
> >
> > Name | Owner | Encoding | Collate | Ctype | Access privileges
> >
> >
> -----------+----------+----------+---------+-------+-----------------------
> >
> > postgres | postgres | UTF8 | C | C |
> >
> > template0 | postgres | UTF8 | C | C | =c/postgres
> +
> >
> > | | | | |
> postgres=CTc/postgres
> >
> > template1 | postgres | UTF8 | C | C | =c/postgres
> +
> >
> > | | | | |
> postgres=CTc/postgres
> >
> > (3 rows)
> >
> >
> >
> > If I run the simple python code below, I get the messy error message at
> the bottom with no simple explanation.
> >
> > I was convinced that I followed the instructions available out there,
> though there must be some setup stuff that I must have missed.
> >
> > Can you please let me know what is missing? To be more concrete, my
> questions are the following:
> >
> > 1) What should I do to run the following command smoothly.
> >
> > XXX:src3 ozan$ psql lecture
> >
> > 2) How can I make my python code run without any errors?
> >
> > 3) What is the semantics of the "ph_hba.conf" lines I have inserted?
> >
> > 4) Is there any documentation that explains all this for a novice who
> wants to have a gentle introduction? (I have collected bits and pieces of
> information from stackoverflow and other places, but it would be nice to
> have everything provided in a compact manner, so that one can have a smooth
> start.)
> >
> > Best regards,
> > Ozan
> >
> > #############
> > import os
> >
> > from sqlalchemy import create_engine
> > from sqlalchemy.orm import scoped_session, sessionmaker
> >
> > engine = create_engine(os.getenv("DATABASE_URL"))
> > db = scoped_session(sessionmaker(bind=engine))
> >
> > def main():
> > flights = db.execute("SELECT origin, destination, duration FROM
> flights").fetchall()
> > for flight in flights:
> > print(f"{flight.origin} to {flight.destination},
> {flight.duration} minutes.")
> >
> > if __name__ == "__main__":
> > main()
> > ############
> >
> >
> >
> >
> > XXX:src3 ozan$ python list.py
> >
> > Traceback (most recent call last):
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line
> 2158, in _wrap_pool_connect
> >
> > return fn()
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 403, in connect
> >
> > return _ConnectionFairy._checkout(self)
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 791, in _checkout
> >
> > fairy = _ConnectionRecord.checkout(pool)
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 532, in checkout
> >
> > rec = pool._do_get()
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 1196, in _do_get
> >
> > self._dec_overflow()
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/util/langhelpers.py",
> line 66, in __exit__
> >
> > compat.reraise(exc_type, exc_value, exc_tb)
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line
> 249, in reraise
> >
> > raise value
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 1193, in _do_get
> >
> > return self._create_connection()
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 350, in _create_connection
> >
> > return _ConnectionRecord(self)
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 477, in __init__
> >
> > self.__connect(first_connect_check=True)
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 674, in __connect
> >
> > connection = pool._invoke_creator(self)
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/strategies.py",
> line 106, in connect
> >
> > return dialect.connect(*cargs, **cparams)
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line
> 412, in connect
> >
> > return self.dbapi.connect(*cargs, **cparams)
> >
> > File "/anaconda3/lib/python3.7/site-packages/psycopg2/__init__.py",
> line 130, in connect
> >
> > conn = _connect(dsn, connection_factory=connection_factory,
> **kwasync)
> >
> > psycopg2.OperationalError: fe_sendauth: no password supplied
> >
> >
> >
> > The above exception was the direct cause of the following exception:
> >
> >
> > Traceback (most recent call last):
> >
> > File "list.py", line 17, in <module>
> >
> > main()
> >
> > File "list.py", line 12, in main
> >
> > flights = db.execute("SELECT origin, destination, duration FROM
> flights").fetchall()
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/orm/scoping.py", line
> 153, in do
> >
> > return getattr(self.registry(), name)(*args, **kwargs)
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/orm/session.py", line
> 1176, in execute
> >
> > bind, close_with_result=True).execute(clause, params or {})
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/orm/session.py", line
> 1040, in _connection_for_bind
> >
> > engine, execution_options)
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/orm/session.py", line
> 409, in _connection_for_bind
> >
> > conn = bind.contextual_connect()
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line
> 2123, in contextual_connect
> >
> > self._wrap_pool_connect(self.pool.connect, None),
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line
> 2162, in _wrap_pool_connect
> >
> > e, dialect, self)
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line
> 1476, in _handle_dbapi_exception_noconnection
> >
> > exc_info
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line
> 265, in raise_from_cause
> >
> > reraise(type(exception), exception, tb=exc_tb, cause=cause)
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line
> 248, in reraise
> >
> > raise value.with_traceback(tb)
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line
> 2158, in _wrap_pool_connect
> >
> > return fn()
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 403, in connect
> >
> > return _ConnectionFairy._checkout(self)
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 791, in _checkout
> >
> > fairy = _ConnectionRecord.checkout(pool)
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 532, in checkout
> >
> > rec = pool._do_get()
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 1196, in _do_get
> >
> > self._dec_overflow()
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/util/langhelpers.py",
> line 66, in __exit__
> >
> > compat.reraise(exc_type, exc_value, exc_tb)
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line
> 249, in reraise
> >
> > raise value
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 1193, in _do_get
> >
> > return self._create_connection()
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 350, in _create_connection
> >
> > return _ConnectionRecord(self)
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 477, in __init__
> >
> > self.__connect(first_connect_check=True)
> >
> > File "/anaconda3/lib/python3.7/site-packages/sqlalchemy/pool.py", line
> 674, in __connect
> >
> > connection = pool._invoke_creator(self)
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/strategies.py",
> line 106, in connect
> >
> > return dialect.connect(*cargs, **cparams)
> >
> > File
> "/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line
> 412, in connect
> >
> > return self.dbapi.connect(*cargs, **cparams)
> >
> > File "/anaconda3/lib/python3.7/site-packages/psycopg2/__init__.py",
> line 130, in connect
> >
> > conn = _connect(dsn, connection_factory=connection_factory,
> **kwasync)
> >
> > sqlalchemy.exc.OperationalError: (psycopg2.OperationalError)
> fe_sendauth: no password supplied
> >
> > (Background on this error at: http://sqlalche.me/e/e3q8)
> >
> >
> >
> >
> >
> > On Sun, 21 Oct 2018 at 17:48, Jeff Frost <jeff(dot)frost(at)gmail(dot)com> wrote:
> >>
> >> Please don't remove the list from the Cc field.
> >>
> >> Since you set it to trust in the pg_hba.conf file, it should work for
> any local OS user.
> >>
> >> If you want other DB users, you need to create them.
> >>
> >> BTW, this is definitely not a bug and would have been better suited for
> the pgsql-novice list.
> >>
> >> On Sun, Oct 21, 2018 at 12:45 AM Ozan Kahramanogullari <
> ozan(dot)kah(at)gmail(dot)com> wrote:
> >>>
> >>> Thank you, this works!
> >>>
> >>> Can I make it work also for any user?
> >>>
> >>> Cheers,
> >>> Ozan
> >>>
> >>>
> >>> =========================================
> >>> Ozan Kahramanoğulları, PhD
> >>> http://sites.google.com/site/ozankahramanogullari/
> >>> -----------------------------------------------------------------------
> >>> University of Trento, Department of Mathematics
> >>> =========================================
> >>>
> >>>
> >>> On Sat, 20 Oct 2018 at 22:46, Jeff Frost <jeff(dot)frost(at)gmail(dot)com> wrote:
> >>>>
> >>>> psql -U postgres
> >>>>
> >>>> is probably what you want.
> >>>>
> >>>> On Fri, Oct 19, 2018 at 7:58 AM Ozan Kahramanogullari <
> ozan(dot)kah(at)gmail(dot)com> wrote:
> >>>>>
> >>>>> Hi,
> >>>>>
> >>>>> I am behind a Mac, and I have been trying to get a local server
> running by following an internet tutorial (which also uses Mac, this one<
> https://video.cs50.net/web/2018/spring/lectures/>).
> >>>>>
> >>>>> I simply try to run psql on the terminal, and I get various error
> messages, depending on how I mess up the file "pg_hba.conf", for example by
> adding the following lines to it, among others:
> >>>>>
> >>>>> local postgres postgres trust
> >>>>> local all postgres trust
> >>>>>
> >>>>> I have spent the whole morning browsing the internet to find a
> solution to my problem, and I also tried backtracking from version 11 of
> PostgreSQL to version 10. I am pasting below some of the error messages
> that I get. The version 10 warns for no support for Mac; is that the
> problem?
> >>>>>
> >>>>> Perhaps, it is me who hasn't been able to dig out the right
> information from the internet. However, I must say that I am quite
> surprised that things get so tedious immediately. I will thus be glad if
> you could help me with getting this running, perhaps by providing some
> up-to-date documentation.
> >>>>>
> >>>>> Thanks,
> >>>>> Ozan
> >>>>>
> >>>>>
> >>>>> XX:src3 ozan$ psql
> >>>>>
> >>>>> Password:
> >>>>>
> >>>>> sql: FATAL: password authentication failed for user "ozan"
> >>>>>
> >>>>> XX:src3 ozan$ psql
> >>>>>
> >>>>> Password:
> >>>>>
> >>>>> psql: FATAL: password authentication failed for user "ozan"
> >>>>>
> >>>>> XX:src3 ozan$ sudo -u postgres psql
> >>>>>
> >>>>> Password:
> >>>>>
> >>>>> Sorry, try again.
> >>>>>
> >>>>> Password:
> >>>>>
> >>>>> sudo: 1 incorrect password attempt
> >>>>>
> >>>>> XX:src3 ozan$ sudo -u postgres psql
> >>>>>
> >>>>> Password:
> >>>>>
> >>>>> Sorry, try again.
> >>>>>
> >>>>> Password:
> >>>>>
> >>>>> could not identify current directory: Permission denied
> >>>>>
> >>>>> Password:
> >>>>>
> >>>>> could not identify current directory: Permission denied
> >>>>>
> >>>>> psql: could not find own program executable
> >>>>>
> >>>>> XX:src3 ozan$ sudo -u postgres psql
> >>>>>
> >>>>> could not identify current directory: Permission denied
> >>>>>
> >>>>> Password:
> >>>>>
> >>>>> could not identify current directory: Permission denied
> >>>>>
> >>>>> psql: could not find own program executable
> >>>>>
> >>>>> XX:src3 ozan$ psql
> >>>>>
> >>>>> Password:
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> =========================================
> >>>>> Ozan Kahramanoğulları, PhD
> >>>>> http://sites.google.com/site/ozankahramanogullari/
> >>>>>
> -----------------------------------------------------------------------
> >>>>> University of Trento, Department of Mathematics
> >>>>> =========================================
>
>
>
> --
> Please don't top post, and don't use HTML e-Mail :} Make your quotes
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>
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>