Postgresql password cannot login

Question

I typed the following instruction to set up the postgresql password.

sudo su - postgres
psql -U postgres
alter user postgres with encrypted password 'my_pass';
\q
sudo su - postgres

But I met the error.

[sudo] password for postgres:my_pass

Sorry, try again.

Which thing did I miss?

I actually set the password.

Thanks.

Answer 1

to change os user password, run sequentially:

sudo su -

passwd postgres

and enter a new password.

Keep in mind that if you are a sudo user, you wont be asked for a password anyway...