I have just installed postgres (mac os), however, when I go to access psql it tries to find the database not the user.
I know the username is benbagley (because that's my system name)
I have tried.
➜ ~ psql
psql: FATAL: database "benbagley" does not exist
and
➜ ~ psql -U benbagley
psql: FATAL: database "benbagley" does not exist
As stated in the manual psql assumes that database name is same as the username when the database is not provided explicitly and tries to connect with that database, which does not exist in your case.
Try connecting with default database which is postgres.
psql -U username -d postgres
Related
I can connect mysql with username without specifying any database name,showkey is one of mysql user:
mysql -u showkey -p
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 14
Server version: 10.3.31-MariaDB-0+deb10u1 Debian 10
Now i log into mysql without specifying any database name.showkey is also a normal user for my postgresql,test is a database name in my postgresql.
psql -d test -U showkey
Timing is on.
Pager usage is off.
Null display is "missing data".
psql (11.14 (Debian 11.14-0+deb10u1))
Type "help" for help.
test=#
I conncet the test database with a normal user showkey,now want to connect postgresql with normal user without specifying database name such way as in mysql:
psql -U showkey
psql: FATAL: database "showkey" does not exist
sudo -u postgres psql can connect postgresql with a super user instead of with normal user.
I'm having trouble using PostgreSQL. I have recently installed this version (13+223.pgdg20.04+1) of postgresql package in ubuntu 20.04.
I'm trying to run psql command, but I get the following error:
psql: error: FATAL: role "my_username" does not exist
I have tried to create a new user with createuser me, but I get the following error:
createuser: error: could not connect to database template1: FATAL: role "my_username" does not exist
I have tried also forcing the postgres user with createuser me --username=postgres, but I get the following error:
createuser: error: could not connect to database template1: FATAL: Peer authentication failed for user "postgres"
How do I solve these problems to use PostgreSQL locally on my computer without these problems?
PD: I have reinstalled postgres and now I'm getting a different error while doing psql:
psql: error: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
I'm not sure why I had a bad installation, but I have completely uninstalled postgres following this post:
https://kb.objectrocket.com/postgresql/how-to-completely-uninstall-postgresql-757
after that I have restarted my computer and installed posgres again following the proper instructions in:
https://www.postgresql.org/download/linux/ubuntu/
and now it looks like it works without problems
Peer authentication means (there are advanced possibilities, but those are not going to be used by default, while the simple method is the default for apt-installed PostgreSQL) that you have to be the OS user 'postgres' to connect as the database user 'postgres'. So you would do:
sudo -u postgres createuser me
You don't need to specify --username=postgres, since that is the default behavior anyway once you use sudo -u postgres
Alternatively, you could change your pg_hba.conf to use a different authentication method other than peer, if you want to.
You need to provide username in the psql command using -U option.
psql -U postgres
Postgresql comes with a predefined superuser role called postgres. If you want to create more roles, you first have to connect as this initial role.
first check user postgres exists:
$ id postgres
Then:
$ su - postgres
Password:
$ psql
psql (15.1 (Debian 15.1-1.pgdg110+1))
Type "help" for help.
If, Password for user postgres is no known then change it:
$ su - postgres
Password:
su: Authentication failure
$ sudo passwd postgres
New password:
Retype new password:
passwd: password updated successfully
Finally again:
$ su - postgres
Password:
$ psql
psql (15.1 (Debian 15.1-1.pgdg110+1))
Type "help" for help.
I am on Linux Mint Cinnamon 2.2.16.
During the process of getting Rails up and running, I am having problems with Postgres.
postgres#BL ~ $ psql --version
psql (Postgres-XC) 1.1
(based on PostgreSQL) 9.2.4
I was unable to get anything working under my usual username, so I changed to the default user using
sudo su - postgres
I cannot get anything to work with createuser.
postgres#BL ~ $ psql
psql: FATAL: role "postgres" does not exist
postgres#BL ~ $ createuser -s -U $USER
createuser: could not connect to database postgres: FATAL: role "postgres" does not exist
postgres#BL ~ $ sudo -u postgres createuser newname
Sorry, user postgres is not allowed to execute '/usr/bin/createuser newname' as postgres on BL.
postgres#BL ~ $ which psql
/usr/bin/psql
postgres#BL ~ $ psql \l
psql: FATAL: role "postgres" does not exist
After thoroughly researching the problem and tearing out more than a few hairs, I decided this was some variation of a problem with packaging/installation, similar problem noted here: unable to create user postgres: role "postgres" does not exists
I did a complete uninstall, as per below, and reinstalled without postgresql-xc
How to thoroughly purge and reinstall postgresql on ubuntu?
The new install had expected behavior with the user "postgres" and I was able to add myself as a superuser and create new databases. After some post-installation finagling, Rails seems to be running and playing nice with postgres.
You have to authenticate to psql as the superuser in order to manage users.
For example
psql -U root
Afterwards
create user paige with password 'paige';
So, I have a Pyramid app with a postgres database on my local machine. I did a pg_dump to get a dump of the data in my database, called pg_dump_2014-04-22. I then git pushed this file, and did a git pull in the VPS to get the file.
Now, I have already installed postgres on my VPS. When I sudo -u postgres psql on my VPS, I can connect to it but there are no relations (naturally).
Both my username and database name are postgres.
So, I tried psql postgres < pg_dump_2014-04-22, but this gives the error psql: FATAL: role "root" does not exist.
I also tried pg_restore -h localhost -U postgres -d postgres pg_dump_2014-04-22, and that prompts me for my password, but then throws the error pg_restore: [archiver(db)] connection to database "postgres" falied: FATAL: password authentication failed for user postgres"
What am I missing here?
You first have to create a user and the database where you want to import your dump
su postgres
createuser root
createdb yourdb
Then import the dump with
psql -d yourdb -f pg_dump_2014-04-22
After installing postgresql, I tried it out, typing createdb mydb, like it's written in the documentation. Then the following error occured:
createdb: could not connect to database postgres: FATAL: role "xxx" does not exist
I studied the documentation, where is said:
You will need to become the operating system user under which PostgreSQL was installed (usually postgres) to create the first user account
I tried this by accessing psql (in my case with sudo -u postgres psql, using Ubuntu 12.10).
But then what should I do?
if the db is owned by user postgres you can do the following
createdb -U postgres dbname
since by default postgresql will trust connections from localhost.
su - postgres
and after you have been logged in:
createdb mydb