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.
Related
I am try to run psql command with postgres role.
(1) sudo psql -U postgres Since postgres differs from my OS username, I receive the Peer authentication failed for user "postgres" error when I run it.
(2) But when I run sudo -u postgres psql, it succeeds
My terminal image
I'm not sure how the (2) commands can work because, according to a Postgres document, peer authentication happens automatically locally and my current OS username is different from postgres. (I made no changes to pg_hba.config or pg_ident.config files.)
And what is the difference between the (1) and the (2) command?
In your first attempt, you used sudo to become the root user (because there was no -u option) and tried to connect as database user postgres, which will fail with peer authentication because root is different from postgres.
In your second attempt, you used sudo to become user postgres and called psql without specifying a username, so that the username defaults to the same as your current operating system user name, namely postgres. Then peer authentication works.
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 installed Postgres with this command
sudo apt-get install postgresql postgresql-client postgresql-contrib libpq-dev
Using psql --version on terminal I get psql (PostgreSQL) 9.3.4
then I installed pgadmin with
sudo apt-get install pgadmin3
Later I opened the UI and create the server with this information
but this error appear
how can I fix it?
Modify password for role postgres:
sudo -u postgres psql postgres
alter user postgres with password 'postgres';
Now connect to pgadmin using username postgres and password postgres
Now you can create roles & databases using pgAdmin
How to change PostgreSQL user password?
You haven't created a user db. If its just a fresh install, the default user is postgres and the password should be blank. After you access it, you can create the users you need.
It helps me:
1. Open the file pg_hba.conf
sudo nano /etc/postgresql/9.x/main/pg_hba.conf
and change this line:
Database administrative login by Unix domain socket
local all postgres md5
to
Database administrative login by Unix domain socket
local all postgres trust
Restart the server
sudo service postgresql restart
Login into psql and set password
psql -U postgres
ALTER USER postgres with password 'new password';
Again open the file pg_hba.conf and change this line:
Database administrative login by Unix domain socket
local all postgres trust
to
Database administrative login by Unix domain socket
local all postgres md5
Restart the server
sudo service postgresql restart
It works.
Helpful links
1: PostgreSQL (from ubuntu.com)
Create a user first. You must do this as user postgres. Because the postgres system account has no password assigned, you can either set a password first, or you go like this:
sudo /bin/bash
# you should be root now
su postgres
# you are postgres now
createuser --interactive
and the programm will prompt you.
First you should change the password using terminal.
(username is postgres)
postgres=# \password postgres
Then you will be prompted to enter the password and confirm it.
Now you will be able to connect using pgadmin with the new password.
if you open the psql console in a terminal window, by typing
$ psql
you're super user username will be shown before the =#, for example:
elisechant=#$
That will be the user name you should use for localhost.
su postgres - password works.
psql, createuser, sudo -u postgres username - same password doesn't work.
Error: psql: FATAL: password authentication failed for user "postgres"
I can log in to postgres user, but anything to do with psql and same password doesn't work. What gives?
There are two completely unrelated passwords here:
the password to the unix user postgres in the operating system; and
the password to the database user postgres in PostgresQL
su - postgres requires the password to the system user named postgres. (By the way, it's better to use sudo -u postgres -i). This password is set with the operating system passwd command.
Commands like createdb, psql, etc require the password for the database user you're connecting to (if using md5 password authentication for PostgreSQL). If you're running under the unix user postgres or you specify -U postgres that is the password for the postgres user. This password is set with the ALTER USER postgres PASSWORD 'new_password' command inside PostgreSQL.
I have a fresh ubuntu 10.10 install with all updates and postgresql 8.4
In order for postgresql to accept login+password connections i have configured it via:
sudo su postgres
psql
ALTER USER postgres WITH PASSWORD 'password';
CREATE DATABASE myapp;
\q
exit
sudo vi /etc/postgresql/8.4/main/pg_hba.conf
change "local all all indent" to "local all all trust"
But, surprisingly, this is not working! The command
psql -U postgres password
Evaluates with error:
psql: FATAL: Ident authentication failed for user "postgres"
Any hints how i can make the psql -U to work?
It is probably a good idea to leave the "postgres" user with ident authentication. By default I believe Ubuntu uses the "postgres" user to perform upgrades, backups, etc, and that requires that it is able to login without a specified password.
I recommend creating another user (probably with your own username) and giving it admin privileges as well. Then you can use that user with passwords on local connections.
Here is what the relevant parts of my pg_hba.conf look like:
# allow postgres user to use "ident" authentication on Unix sockets
# (as per recent comments, omit "sameuser" if on postgres 8.4 or later)
local all postgres ident sameuser
# allow all other users to use "md5" authentication on Unix sockets
local all all md5
# for users connected via local IPv4 or IPv6 connections, always require md5
host all all 127.0.0.1/32 md5
host all all ::1/128 md5
Also note that psql -U postgres password will not do what you want. The password should never be specified on the commandline. That will try to login as user "postgres" to a database named "password".
You should use psql -U postgres myapp instead. Postgres will automatically prompt you for a password, if it is configured properly to require one.
In case we want the password be filled-in automatically, place it in $HOME/.pgpass file
I think your pg_ident.conf file is misconfigured. Also, have you tried
psql -U postgres -W
Another thing that can cause this is expired credentials. I don't think this happened in version 8, but in version 9 when you create a new role in pgadmin, it is created in an expired state and you need to change or clear the role's expiration date before you will be able to login with it.
You may find it helpful to create the database's user and schema in PostgreSQL:
Log into PostgreSQL from the postgres user
$ sudo -u postgres psql postgres
Once in, create the user and database
CREATE ROLE myuser LOGIN PASSWORD 'mypass';
CREATE DATABASE mydatabase WITH OWNER = myuser;
Log into PostgreSQL from the new user account
$ psql -h localhost -d mydatabase -U myuser -p <port>