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.
Related
I'm trying a tutorial for django that it uses postgresql but I have some issues in setting up the DB. I did change postgres password using sudo passwd postgres and I can login to postgres account using su postgres or sudo su - postgres but after that I can't access the postgres prompt with pqsl. It gives me the following error:
psql: FATAL: password authentication failed for user "postgres"
I've changed the pg_hba.conf file too (from peer to md5) but it didn't change anything.
I've never worked with postgresql and this is my first time using it so if you need any other information please ask me.
sudo passwd postgres is for the system user postgres which is why you can su to system user postgres shell. When you are doing psql -U postgres you are logging in as database user postgres. That is a different account. It is convention that the system user the Postgres server runs as is generally called postgres. Also by convention the Postgres server database 'root/superuser' is the name of the user that the server runs as, so again generally postgres. If you want to log in as postgres user to server using password you will need to create a password for the database user postgres. To do that I would see if in pg_hba.conf the local (not localhost) line is set to trust. If not set it to that and and do:
psql -U postgres -d postgres
Do not specify a -h. This will connect you via a local socket. Then you can :
https://www.postgresql.org/docs/12/sql-alteruser.html
ALTER USER postgres WITH PASSWORD 'your_password'
This will create a password for postgres user.
FYI, you don't have to log into system user postgres account to work as postgres user in database. All you have to do is specify -U postgres to any of the Postgres client programs, psql, pg_dump, etc. This also means you can work as postgres database user on remote servers.
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
My OS is Fedora 26
I have installed Postgresql and Phoenix.
Postgres has a superuser "postgres" with password "postgres". This is confirmed by running \du in psql.
When I run $ mix ecto.create, I get
** (Mix) The database for Hello.Repo couldn't be created: FATAL 28000 (invalid_authorization_specification): Ident authentication failed for user "postgres"
I suspect it may be a permissions issue. To log into psql requires
$ sudo -u postgres psql postgres
Whereas Phoenix when attempting to use postgres may not have sudo privilages.
$ psql --version
psql (PostgreSQL) 9.6.8
Any thoughts appreciated.
By default the authentication for the postgres database user connecting to the DB locally is to verify that the operating system user is also postgres. This is what the error message refers to as Ident authentication and is why connection after doing sudo -u postgres works.
To connect as the postgres user using another means of authentication you need to edit the pg_hba.conf file. (HBA stands for host based authentication).
The line that allows this will look like this:
local all postgres peer
Add a line that looks like this (without removing the other line!):
local all postgres md5
And you should be able to connect using the password for postgres as well.
If I remember correctly you will need to restart the DB for this to take effect.
I'm setting up my PostgreSQL 9.1 in windows.
I can't do anything with PostgreSQL: can't createdb, can't createuser; all operations return the error message
Fatal: role root does not exist
root is my account name, which I created while installing Postgresql
But I am able to connect using:
username : postgres
How can I connect to postgres using role root?
There is a solution mentioned for linux platforms using su command here but not able to figure out solution for windows7
Thanks in Advance
If you want to login to Postgres using the username root you need to first create such a user.
You first need to login as the Postgres super user. This is typically postgres (and is specified during installation):
psql -U postgres <user-name>
Then you can create roles and databases:
psql (9.4.0)
Type "help" for help.
postgres=# create user root with password 'verysecret';
CREATE ROLE
postgres=# \q
c:\
c:\>psql -U root postgres
psql (9.4.0)
Type "help" for help.
postgres=>
Logged in as the superuser you can also grant the root user the necessary privileges.
All parameters for psql are documented in the manual.
Creating users and databases is also documented in the manual:
connecting to the database
create user
create database
In some cases, when you install postgres the initial DB is not created.
You need to execute initdb.
Same issue appeared while restoring DB/table on postgres docker container .
. When you connect to Postgres DB(psql shell) from inside the docker container, the default user would be a "root" (unless you specify psql -U "some-user-name")
[Manjunath-MacBook-Air:$ sudo docker exec -it a2ff6075344e bash
bash-5.0# psql -U postgres postgres < testdb_pg_dump
So, the issue gets resolved, by logging to psql shell with appropriate username
Here , -U postgres specifies that user connecting to DB is "postgres"
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