ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO) on MAC OSX

Question

I'm trying to reinstall mysql on my MAC OS X Yosemite. for this I followed the instruction as mentioned below

sudo rm /usr/local/mysql
sudo rm -rf /usr/local/mysql*
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/MySQL*
vim /etc/hostconfig and removed the line MYSQLCOM=-YES-
rm -rf ~/Library/PreferencePanes/MySQL*
sudo rm -rf /Library/Receipts/mysql*
sudo rm -rf /Library/Receipts/MySQL*
sudo rm -rf /var/db/receipts/com.mysql.*

I also tried

brew uninstall mysql

after this I installed mysql using homebrew using command brew install mysql. After installation when I tried to run mysql -u root It throws the following error

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

I didn't set password for mysql.I don't know what's going wrong.Any suggestion will be appreciated. Thank you

Answer 1

I installed mysql with homebrew and got the same problem as you because mysql has had an existing database with an existing password there. See this article for more details.

$ brew services stop mysql
$ sudo pkill mysqld
$ sudo rm -rf /usr/local/var/mysql/ # NOTE: this will delete your existing database!!!
$ brew postinstall mysql
$ brew services restart mysql
$ mysql -uroot

Answer 2

Now sql generates an aliatory password that appears in the last screen.

sudo mysql -u root -h 127.0.0.1 -p
Enter password: (aliatory password)

we can change it

ALTER USER 'root'@'localhost' IDENTIFIED BY 'new-password';