PostgreSQL: How to change PostgreSQL user password?

To login without a password:

sudo -u user_name psql db_name

To reset the password if you have forgotten:

ALTER USER user_name WITH PASSWORD 'new_password';

Then type:

$ sudo -u postgres psql

Then:

\password postgres

Then to quit psql:

\q

If that does not work, reconfigure authentication.

Edit /etc/postgresql/9.1/main/pg_hba.conf (path will differ) and change:

    local   all             all                                     peer

to:

    local   all             all                                     md5

Then restart the server:

$ sudo service postgresql restart

You can and should have the users's password encrypted:

ALTER USER username WITH ENCRYPTED PASSWORD 'password';

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