brew install mysql on macOS

I'm trying to setup up MySQL on mac os 10.6 using Homebrew by brew install mysql 5.1.52.

Everything goes well and I am also successful with the mysql_install_db.
However when I try to connect to the server using:

/usr/local/Cellar/mysql/5.1.52/bin/mysqladmin -u root password 'mypass'

I get:

/usr/local/Cellar/mysql/5.1.52/bin/mysqladmin: connect to server at 'localhost' 
failed error: 'Access denied for user 'root'@'localhost' (using password: NO)'

I've tried to access mysqladmin or mysql using -u root -proot as well,
but it doesn't work with or without password.

This is a brand new installation on a brand new machine and as far as I know the new installation must be accessible without a root password. I also tried:

/usr/local/Cellar/mysql/5.1.52/bin/mysql_secure_installation

but I also get

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

I think one can end up in this position with older versions of mysql already installed. I had the same problem and none of the above solutions worked for me. I fixed it thus:

Used brew's remove & cleanup commands, unloaded the launchctl script, then deleted the mysql directory in /usr/local/var, deleted my existing /etc/my.cnf (leave that one up to you, should it apply) and launchctl plist

Updated the string for the plist. Note also your alternate security script directory will be based on which version of MySQL you are installing.

Step-by-step:

brew remove mysql

brew cleanup

launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist

rm ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist

sudo rm -rf /usr/local/var/mysql

I then started from scratch:

1. installed mysql with brew install mysql

2. ran the commands brew suggested: (see note: below)

   unset TMPDIR
   
   mysql_install_db --verbose --user=`whoami` --basedir="$(brew --prefix mysql)" --datadir=/usr/local/var/mysql --tmpdir=/tmp
   

3. Start mysql with mysql.server start command, to be able to log on it

4. Used the alternate security script:

   /usr/local/Cellar/mysql/5.5.10/bin/mysql_secure_installation
   

5. Followed the launchctl section from the brew package script output such as,

   #start
   launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
   
   #stop
   launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
   

Note: the --force bit on brew cleanup will also cleanup outdated kegs, think it's a new-ish homebrew feature.

Note the second: a commenter says step 2 is not required. I don't want to test it, so YMMV!

Here are detailed instructions combining getting rid of all MySQL from your Mac then installing it The Brew Way as Sedorner wrote above:

Remove MySQL completely per The Tech Lab

• ps -ax | grep mysql
• stop and kill any MySQL processes
• sudo rm /usr/local/mysql
• sudo rm -rf /usr/local/var/mysql
• sudo rm -rf /usr/local/mysql*
• sudo rm ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
• sudo rm -rf /Library/StartupItems/MySQLCOM
• sudo rm -rf /Library/PreferencePanes/My*
• launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
• edit /etc/hostconfig and remove the line MYSQLCOM=-YES-
• rm -rf ~/Library/PreferencePanes/My*
• sudo rm -rf /Library/Receipts/mysql*
• sudo rm -rf /Library/Receipts/MySQL*
• sudo rm -rf /private/var/db/receipts/*mysql*
• sudo rm -rf /tmp/mysql*
• try to run mysql, it shouldn't work

Brew install MySQL per user Sedorner from this StackOverflow answer

• brew doctor and fix any errors

• brew remove mysql

• brew cleanup

• brew update

• brew install mysql

• unset TMPDIR

    mysql_install_db --verbose --user=`whoami` --basedir="$(brew --prefix mysql)" --datadir=/usr/local/var/mysql --tmpdir=/tmp # whoami is executed inline
  

• mysql.server start

• run the commands Brew suggests, add MySQL to launchctl so it automatically launches at startup

mysql should now work and be running all the time as expected

Godspeed.

Had the same problem. Seems like there is something wrong with the set up instructions or the initial tables that are being created. This is how I got mysqld running on my machine.

If the mysqld server is already running on your Mac, stop it first with:

launchctl unload -w ~/Library/LaunchAgents/com.mysql.mysqld.plist

Start the mysqld server with the following command which lets anyone log in with full permissions.

mysqld_safe --skip-grant-tables

Then run mysql -u root which should now let you log in successfully without a password. The following command should reset all the root passwords.

UPDATE mysql.user SET Password=PASSWORD('NewPassword') WHERE User='root'; FLUSH PRIVILEGES;

Now if you kill the running copy of mysqld_safe and start it up again without the skip-grant-tables option, you should be able to log in with mysql -u root -p and the new password you just set.