This question is similar to create database using psql in shell script takes username as db name, but since that doesn't have an accepted answer I'm asking it again here. I've created a user with username myuser and password mypassword:
> psql
psql (11.5)
Type "help" for help.
kurt=# \du
List of roles
Role name | Attributes | Member of
-----------+------------------------------------------------------------+-----------
kurt | Superuser, Create role, Create DB, Replication, Bypass RLS | {}
myuser | | {}
kurt=#
However, if I do psql --username=myuser, I get an error that database "myuser" does not exist:
> psql --username=myuser
psql: FATAL: database "myuser" does not exist
I'm a bit confused by this error message, because according to psql --help, this is a user name, not a database name:
Connection options:
-h, --host=HOSTNAME database server host or socket directory (default: "local socket")
-p, --port=PORT database server port (default: "5432")
-U, --username=USERNAME database user name (default: "kurt")
-w, --no-password never prompt for password
-W, --password force password prompt (should happen automatically)
Any idea what I'm doing wrong? Here is the version of psql I'm using:
> psql --version
psql (PostgreSQL) 11.5
Quote from the manual
The default user name is your operating-system user name, as is the default database name
If you specify a username, that username is then also assumed as the default for the database name.
After creating your new user, first you have to login using postgres user and create new database similar to your new created user. ex: if my new user is "david", I must create also database called "david" using posgtres user.After this you can now login using your new user created.
Related
Please check below command which I had run:
C:\Windows\system32>psql -U root
Password for user root:
psql: FATAL: database "root" does not exist
If you don't explicitly specify which database you want to connect to, psql will use the database with the same name as the database user.
Since you specified database user root, psql tries to connect to a database of that name, but the database doesn't exist.
Try specifying an existing database:
psql -U root -d mydb
In case you don't know which database to use, or if you never created a database, you can always use the postgres database.
I want to connect to my newly created database called "test" in psql, I have seen a command like this:
Connection
\c[onnect] {[DBNAME|- USER|- HOST|- PORT|-] | conninfo}
connect to new database (currently "postgres")
What does that mean?
I tried to write:
\c {test|- postgres|- localhost|- 5432|- | conninfo}
but got error:
invalid integer value "5432|-" for connection option "port"
What should I do?
Did you try
\c postgresql://user#localhost/test
Or
\c "host=localhost port=5432 dbname=test connect_timeout=10"
Source
the \c is used when you are already connected to a database and wants to connect to another database.
e.g if you are connected with postgres db and wants to connect with test database then you can do is
\c test
and if using psql then
./psql -U postgres -d test -p 5432
And I just find that this way will work, for all other people like me:
\l
so that you will see a list of dbs that you created, and if you want to see a certain table then
\c db_name
Then you will successfully connect it if the db exists.
My PostgreSQL version is -
psql (15.2 (Ubuntu 15.2-1.pgdg22.04+1))
Connect (\c) is used at psql command prompt and the command syntax is -
\connect (or \c) [ dbname [ username ] [ host ] [ port ] ]
this command takes the value from previous connection for all four input values if we don't pass any value. we can understand this as below -
postgres=# \c (if we don't pass anything on this prompt then it will take all values (db name, user name, host and port) from previous connection.)
postgres=# \c test (here we are passing one value and this value be taken as database name, for other values user name, host name and port will be used from previous connection)
postgres=# \c test testuser (here host and port will be inherit from previous connection while first value will be taken as database name while second value will be taken as user name)
postgres=# \c test testuser localhost (here port will be used from previous connection while other three values db name, user name and host will be taken from given three values)
postgres=# \c test testuser localhost 5432 (in this command all four values are passed hence it will pick from here only)
post execute above command the output is -
postgres=# \c testdb testadmin localhost 5432
Password for user testadmin:
You are now connected to database "testdb" as user "testadmin".
Im currently creating an API for a school project and everything is working good. My setup is: Node v10, Postgres, Koa and so on...
I currently have this:
CREATE ROLE sa WITH LOGIN PASSWORD 'some-password.';
CREATE DATABASE master WITH OWNER sa;
\c master;
When the init script runs in the docker machine the output I get is this one:
CREATE ROLE
CREATE DATABASE
You are now connected to database "master" as user "postgres".
So I did change the file to something like this:
CREATE ROLE sa WITH LOGIN PASSWORD 'some-password.';
CREATE DATABASE master WITH OWNER sa;
CONNECT TO master AS main USER sa;
And I get a syntax error:
STATEMENT: CONNECT TO master AS sa USER sa;
psql:/docker-entrypoint-initdb.d/init.sql:4: ERROR: syntax error at or near "CONNECT"
I can't find anywhere in docs (or haven't look very good) how to connect from a .sql file to a database with an specific user.
How would I connect to 'master' with its owner, which is 'sa' from a .sql file?
You can do this via this command in psql:
\c db_name usr_name
Here my assumption is you have a SQL file called "a.sql" and contains the lines of code in the file.
CREATE ROLE sa WITH LOGIN PASSWORD 'some-password.';
CREATE DATABASE master WITH OWNER sa;
\c master;
Now you are running this script using "psql" command line interface (CLI), so you get the message as below...
CREATE ROLE
CREATE DATABASE
You are now connected to database "master" as user "postgres".
Now, the thing to be noted that you have connected to database "master" because of "\c master" with user "postgres" because of you passed the credential of "postgres" user. Is I am right here then, If yes, then you have to pass the user and password for different user i.e. "sa" as below.
psql -h localhost -p 5432 -U sa -f a.sql master
Now, it will prompt for the password of "sa" user, finally, your script will run and you will be connected to "sa" user.
You can do this via this command in terminal
psql -d database -U username
I can't seem to access my superuser account for my posgresQL database.
Using the command:
psql -U postgres
I sucessfully login into the user 'postgres'. However, this is not the default superuser. Doing:
=# \du
I get:
List of roles
Role name | Attributes | Member of
-----------+-------------------------------------+-----------
pgsql | Superuser, Create DB | {}
postgres | Create role, Create DB, Replication | {}
So 'pgsql' appears to be my default superuser.
When trying:
psql -U pgsql
I get the following error:
psql: FATAL: database "pgsql" does not exist
I changed the pg_hba.conf file to the following:
# Database administrative login by Unix domain socket
local all all trust
and also tried:
# Database administrative login by Unix domain socket
local all pgsql trust
but I still get the same error regardless, that database 'pgsql' does not exist.
Any help would be greatly appreciated, I need to be able to access the database's superuser.
just define database:
psql -U pgsql -d postgres
if you get error that postgres database does not exist, connect as postgres and list databases with \l
I am pretty much confused about root user,super user,user and permissions! I am not able to create a database inside user "athleticu". Following are the commands I used:-
athleticu#ip-172-30-4-103:/home/ubuntu$ createdb -T template0 simple_db1
createdb: database creation failed: ERROR: permission denied to create database
athleticu#ip-172-30-4-103:/home/ubuntu$ sudo createdb -T template0 simple_db1
sudo: unable to resolve host ip-172-30-4-103
createdb: could not connect to database template1: FATAL: role "root" does not exist
Please somebody clarify my doubts and tell me what should I write!
Hey I have already solved this. What you have to do is to first login as postgres user as follows:
$ su postgres
$ psql
postgres=# alter user athleticu createdb;
ALTER ROLE
Hope it helps you :)
Type \du in psql and you will see a list of all the registered users and what type of privileges each one has.
In order to grant privileges to the user which is logged in (eg 'user1'), I had to sign out and log in using one of the superuser roles in that list (eg. 'user2'), using the following command:
psql -U 'user2' -h localhost 'database2'
where 'database2' is the name of the one that specific superuser 'user2' has privileges to.
Once you are logged in as a superuser, you can grant privileges to 'user1' by:
ALTER ROLE user1 WITH CREATEDB
or
ALTER ROLE user1 WITH SUPERUSER
Then sign in again as user1, who is now a superuser.
This blog was helpful as well as this link.
Currently, this worked for me:
sudo su postgres
psql
ALTER USER username WITH CREATEDB;
\q
exit
The root user is an account on the system independent from Postgres. There is only one root user.
A superuser is an account in Postgres with access to everything. There may be many superusers.
System accounts and Postgres accounts are different things, although unless you specify a Postgres username when you connect to the database (through utilities like psql, createdb, dropdb, or otherwise), it will use the current system user's name in hopes that there is a corresponding Postgres account with the same name. The root user does not, by default, have a corresponding account in Postgres.
When you install Postgres on *nix, it creates both a superuser named postgres and a system user named postgres.
Therefore, when you need to do something with Postgres as the built-in superuser, you have two options:
You may sudo su - postgres to become the postgres system user and execute your command (createdb, psql, etc). Because the system user has the same name as the database superuser, your command will connect as the appropriate account.
You may specify the username to execute as with the -U switch, eg psql -U postgres ....
Depending on your Postgres server's authentication settings, you may be required to enter a password with either or both connection methods.
What you can do when you have fresh installation of PostgreSQL is create your user with some rights (see createuser documentation):
my-user> sudo su - postgres -c "createuser <my-user> --createdb"
This will allow my-user to create DBs just like so:
my-user> createdb <my-db>
If you want the my-user to be able to do anything just use the --superuser flag instead:
my-user> sudo su - postgres -c "createuser <my-user> --superuser"
I got the same error and I found out that the reason was that I was trying to create a database outside of psql as a user which did not exist for postgresql. I found out about it and solved it by taking the following steps:
In my terminal I logged in as postgres user (the root user by default for postgresql) by typing sudo -u postgres psql
While inside the psql I typed \du to see all users and their privileges. I found out that I had only one user (the postgres one) and I had to create another superuser which had the same username as my Linux user (george)
I typed (still inside psql) CREATE USER george SUPERUSER; and this way I created a new super user called george.
I exited psql (by typing \q) and I was now able from outside psql, meaning from my terminal, to run created db <database name> with no issues at all.
Error ? You are trying to perform database actions( Creating Database, creating Roles) using a user that doesn't have the permission for those types of actions you are trying to perform.
solution ? Simply login to your database on the command line, i.e for PostgreSQL one will use "sudo -u postgres psql", then confirm that users specific assigned roles using the command "\du", most probably he/she doesn't have the necessary permissions to perform the actions you wanted. Then simply assign the roles you want the user to perform ,i.e create Database or simply make user "Superuser" by following along(https://chartio.com/resources/tutorials/how-to-change-a-user-to-superuser-in-postgresql/)