psql on Mac

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.kah@gmail.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.frost@gmail.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.kah@gmail.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.frost@gmail.com> wrote:
>>>>
>>>> psql -U postgres
>>>>
>>>> is probably what you want.
>>>>
>>>> On Fri, Oct 19, 2018 at 7:58 AM Ozan Kahramanogullari <ozan.kah@gmail.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
>>>>> =========================================



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