[postgresql] PostgreSQL error: Fatal: role "username" does not exist

I'm setting up my PostgreSQL 9.1. I can't do anything with PostgreSQL: can't createdb, can't createuser; all operations return the error message

Fatal: role h9uest does not exist

h9uest is my account name, and I sudo apt-get install PostgreSQL 9.1 under this account.
Similar error persists for the root account.

For Windows users : psql -U postgres

You should see then the command-line interface to PostgreSQL: postgres=#

For version Postgres 9.5 use following comand:

psql -h localhost -U postgres

Hope this will help.

psql postgres

postgres=# CREATE ROLE username superuser;
postgres=# ALTER ROLE username WITH LOGIN;

Working method,

1. vi /etc/postgresql/9.3/main/pg_hba.conf
2. local all postgres peer here change peer to trust

3. restart, sudo service postgresql restart

4. now try, psql -U postgres

Installing postgres using apt-get does not create a user role or a database.

To create a superuser role and a database for your personal user account:

sudo -u postgres createuser -s $(whoami); createdb $(whoami)

This works for me:

psql -h localhost -U postgres

sudo su - postgres

psql template1

creating role on pgsql with privilege as "superuser"

CREATE ROLE username superuser;
eg. CREATE ROLE demo superuser;

Then create user

CREATE USER username; 
eg. CREATE USER demo;

Assign privilege to user

GRANT ROOT TO username;

And then enable login that user, so you can run e.g.: psql template1, from normal $ terminal:

ALTER ROLE username WITH LOGIN;

In local user prompt, not root user prompt, type

sudo -u postgres createuser <local username>

Then enter password for local user.

Then enter the previous command that generated "role 'username' does not exist."

Above steps solved the problem for me. If not, please send terminal messages for above steps.

Something as simple as changing port from 5432 to 5433 worked for me.

After trying many other people's solutions, and without success, this answer finally helped me.

https://stackoverflow.com/a/16974197/2433309

In short, running

sudo -u postgres createuser owning_user

creates a role with name owning_user (in this case, h9uest). After that you can run rake db:create from the terminal under whatever account name you set up without having to enter into the Postgres environment.

dump and restore with --no-owner --no-privileges flags

e.g.

dump - pg_dump --no-owner --no-privileges --format=c --dbname=postgres://userpass:username@postgres:5432/schemaname > /tmp/full.dump

restore - pg_restore --no-owner --no-privileges --format=c --dbname=postgres://userpass:username@postgres:5432/schemaname /tmp/full.dump

I installed it on macOS and had to:

cd /Applications/Postgres.app/Contents/Versions/9.5/bin
createuser -U postgres -s YOURUSERNAME
createdb YOURUSERNAME

Here's the source: https://github.com/PostgresApp/PostgresApp/issues/313#issuecomment-192461641

Follow These Steps and it Will Work For You :

1. run msfconsole
2. type db_console
3. some information will be shown to you chose the information who tell you to make: db_connect user:pass@host:port.../database sorry I don't remember it but it's like this one then replace the user and the password and the host and the database with the information included in the database.yml in the emplacement: /usr/share/metasploit-framework/config
4. you will see. rebuilding the model cache in the background.
5. Type apt-get update && apt-get upgrade after the update restart the terminal and lunch msfconsole and it works you can check that by typing in msfconsole: msf>db_status you will see that it's connected.

Manually creating a DB cluster solved it in my case.

For some reason, when I installed postgres, the "initial DB" wasn't created. Executing initdb did the trick for me.

This solution is provided in the PostgreSQL Wiki - First steps:

initdb

Typically installing postgres to your OS creates an "initial DB" and starts the postgres server daemon running. If not then you'll need to run initdb