Install MySQL on Mountain Lion with Homebrew


I recently upgraded to Mountain Lion and like every good little nerd, I did 7 pass writing of zeros to my harddrive.  In other words, I erased the crap out of it and created a fresh install.  A lot of people complain this is quite annoying as you have to reinstall and re-setup everything on your Mac.  I actually enjoy it because it gives me a clean slate and a chance to de-clutter my machine and do fresh installs and configs of all my software.  If you develop locally, one of the issues you’re going to run into is that you need to get MySQL, PHP, Ruby, Python, etc… and Apache all running again.  Like I said before, one of the nice things about starting fresh is that you can try new things.  One thing I have vowed to do this go around is pull all of my packages and installs down with Homebrew.  So let’s get started.

Update: 2-23-2013
After setting up a new machine today I realized this post uses an old version of MySQL from the Homebrew registry. If you were running into trouble with some of the code snippets it is because the post is making the assumption that Homebrew is pulling down MySQL version 5.5.25a, but currently Homebrew installs 5.6.10 (as of this update). I’ve updated the code snippets below, but be sure to check what version is being pulled down in the future. I also ran into an issue with trying to access localhost from PHP scripts and realized php.ini was the culprit. If you’re using the Homebrew package for MySQL and the default php.ini file (located in /etc/php.ini) then your trying to connect through the default_socket at /var/mysql/mysql.sock which very well might not exist depending on your situation. You can do one of two things, replace all occurrences of


with this instead


or alternatively if you don’t want to mess with the php.ini you could just run a symlink like so

ln -s /tmp/mysql.sock /var/mysql/mysql.sock

You might need to create the /var/mysql directory if it doesn’t exist. Hope that helps someone.

First we need to open up our trusty Terminal app and install Homebrew.  This is pretty darn simple thanks to ruby and git, just run the following command:

ruby <(curl -fsSk

This will pull down Homebrew and get it all installed and running for you. It will prompt you to press enter after it shows you what it’s going to do. The great thing about Homebrew and the reason I will be using it is because of it’s modularity. It creates it’s own little “house” of packages and code that keeps everything quite tidy. So now that we have Homebrew, we can extremely simply pull down the newest copy of MySQL by running the following command:

$ brew install mysql

Yep, it’s that easy. Now, out of the box you won’t be up and running MySQL queries quite yet. You need to run a few more commands to get things situated. I like to have the mysql server start on startup and to do so you would run the following commands:

$ mkdir -p ~/Library/LaunchAgents
$ cp /usr/local/Cellar/mysql/5.6.10/homebrew.mxcl.mysql.plist ~/Library/LaunchAgents/
$ launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist

You’ll also need to unset the temp directory and install the mysql system tables

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

And lastly you’ll want to reset the root password

$ /usr/local/Cellar/mysql/5.6.10/bin/mysqladmin -u root password 'YOUR_NEW_PASSWORD'

Now you are ready to start the sql server and run your first query:

$ mysql.server start
$ mysql

Doesn’t get much easier than this. Share your thoughts in the comments on how to get things back into running order after a fresh install.

64 Responses to Install MySQL on Mountain Lion with Homebrew

Jason says: August 16, 2012 at 11:49 pm

Nice article! How would I go about doing this without using Homebrew? Is there an easy way to do it without using Terminal?

Rob says: August 16, 2012 at 11:54 pm

Thanks Jason. If you didn’t want to use Homebrew (though I suggest you do) you could pull down mysql using wget, curl or some other similar method. You could also just hit this page to download it manually and install it yourself, but this would be a tutorial unto itself. Thanks for the interest!

Gregg says: August 24, 2012 at 12:26 am

Thanks for this nice recipe. Everything works fine except that when I try

/usr/local/Cellar/mysql/5.5.25a/bin/mysqladmin -u root password ‘YOUR_NEW_PASSWORD’

mysql returns with

error: ‘Access denied for user ‘root’@'localhost’ (using password: NO)’

Any tips?


Rob Bennet says: August 24, 2012 at 12:55 am

There are multiple reasons this could be happening, the most likely reason is that you have an older version of mysql installed before you did the brew install. There are a few ways to go about fixing this, but this thread on StackOverflow should get you where you need to be. Thanks for reading!

Cailen says: November 24, 2012 at 8:21 pm

This was helpful, thank you Rob.

In response to @Gregg’s particular enquiry, the stdout upon installing the mysql system tables supplies a different path than that which you did, namely:

/usr/local/opt/mysql/bin/mysqladmin -u root password ‘new-password’

I suspect Gregg may not have read all of the output in his commandline while following your directions.


Pablo says: October 10, 2012 at 5:57 pm

Thanks for the great post! If you have time, would you mind explaining what’s going on when running unset TMPDIR and mysql_install_db?

Rick Roberts says: October 18, 2012 at 6:10 pm

Hey, Rob. I’m having trouble getting automysqlbackup working now. Seems directories aren’t where they are expected. Any ideas?

Matt Hauth says: November 4, 2012 at 7:42 pm

FYI Homebrew will change versions. Some newbies like myself might not notice they need to change the mysql version when trying to run the CP as well as setting a new root password.

Hopefully this helps someone. I found the current version by cd /usr/local/Cellar/mysql/


diek says: November 19, 2012 at 2:16 am

Thanks for the post. The most current mysql download from homebrew creates 5.5.27, vice 5.5.25a. Prob what caused the error for Rick above. The folder is 5.5.27.


Jared says: November 30, 2012 at 3:05 pm

Thanks for the post. I am a RedHat admin type working on understanding Mac. I need to get the mysql service to boot upon system start/reboot. I very much like hombrew to manage software installs and I have installed MySQL on the machine and it runs fine. I can get to the MySQL server to start with “launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist” but I need to put “homebrew.mxcl.mysql.plist” somewhere, or I assume I do, so that it will be read and executed upon booting up and that will solve getting it started at boot.

Any help on what I have right, or not right, when it comes to this would be a great help. I have Googled a number of items with no real results for admining a Mac like I would a RedHat, or other INX box. Anyone have any sources of value.

Thanks for taking the time all to post.

Cody says: January 15, 2013 at 11:24 pm

Oh my gosh! Have been scouring the internet trying to get my installation of mysql to work! Finally found yours thanks so much! Super helpful!!!

Steve says: January 25, 2013 at 3:55 am

Thanks a bunch — After trying twice unsuccessfully with the binary install from oracle, I removed everything and started over following your homebrew recipe. The only slight comment I would make (assuming I made the correct choice) is that in the command line where you do:

$ mysql_install_db –verbose –user=`whoami`

I replace the `whoami` with –user=steve (which is the admin user on my machine) … I assume that was the right thing to do, cause I was able to start the server and get into the database.

so a big THANKS!

Troy Murray says: February 24, 2013 at 5:36 pm


the `whoami` actually dynamically determines your user account name and inserts it into the command when you run it. You get the same results just adding your name like you did, but for Rob’s posting it makes sense since the user running it could have any name

Chris says: February 23, 2013 at 2:09 am

Thanks for this.

One thing I found is that Homebrew did not create the folder path: /usr/local/var/mysql when it installed mysql so I had to do that manually.

Mark Learst says: March 4, 2013 at 6:59 am

I had to reinstall OS X (10.8.2) and my dev environment, was going crazy till I found this reply by Chris. Once I added this folder path too “/usr/local/var/mysql” everything was back to normal.

Richard Lai says: February 26, 2013 at 1:46 am


I am having issues with the current version of mysql 5.6.10 with rails and I would like to use an older version of mysql. How do I change it so that it would use the other versions in my folder /usr/local/Cellar/mysql such as 5.5.28?

Rob Bennet says: March 12, 2013 at 10:21 pm

You could just change the symlink in /usr/local/opt
Using Terminal,
cd /usr/local/opt
ln -s -f /usr/local/Cellar/mysql/5.5.28 mysql
I’m just passing a -f option to force the symlink instead of having to delete the sym and then re-create/link it.

Marques says: March 13, 2013 at 2:25 pm

I am getting a blank FATAL ERROR: message after running mysql_install_db –verbose –user=`whoami` –basedir=”$(brew –prefix mysql)” –datadir=/usr/local/var/mysql –tmpdir=/tmp

I am using Mountain Lion and mysql version 5.6.10

Any suggestions?

Marques says: March 13, 2013 at 2:48 pm

Nevermind, I closed my terminal and tried again with ‘sudo’ and it worked fine.

Thanks for the awesome article!

Kyle says: March 14, 2013 at 9:12 pm

Great article, thanks. Though I went through it rather quickly and ended up setting my new root password to YOUR_NEW_PASSWORD :)

Bogdan says: June 6, 2013 at 12:40 pm

Hi, i am having trouble with the: “mysql_install_db –verbose –user=`whoami` –basedir=”$(brew –prefix mysql)” –datadir=/usr/local/var/mysql –tmpdir=/tmp” command. It is not working for me, i am getting this error:

2013-06-06 14:38:22 561 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 35
2013-06-06 14:38:22 561 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2013-06-06 14:38:22 561 [Note] InnoDB: Unable to open the first data file
2013-06-06 14:38:22 7fff7438a180 InnoDB: Operating system error number 35 in a file operation.
InnoDB: Error number 35 means ‘Resource temporarily unavailable’

Please help!

JP Lew says: June 10, 2013 at 4:21 am

I get the same error. While I could be mistaken, I think this step is no longer necessary.

MySQL 5.6.10 installation via Homebrew seems to work fine without having to create these tables. I think the installer does it automatically.

JP says: June 10, 2013 at 11:02 am

woops, correction. You do need to run that command. The reason it’s giving you that error is because you have another mysqld process running.
Find those mysqld processes using top or Activity Monitor, then kill them.

Jacob Morris says: June 21, 2013 at 7:21 am

I get the following error while trying to run: mysql_install_db –verbose –user=`whoami` –basedir=”$(brew –prefix mysql)” –datadir=/usr/local/var/mysql –tmpdir=/tmp

Terminal returns:
2013-06-21 09:20:50 43364 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 35
2013-06-21 09:20:50 43364 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.

Any suggestions?

Bryan Estrito says: August 10, 2013 at 6:09 pm

unload your launchctl first because it starts already the mysqld

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

then repeat the mysql_install_db command

Ashton says: October 9, 2013 at 9:16 pm

The mysql version changes, so the command given to copy the plist won’t work verbatim…

Something like this would be more flexible

cp /usr/local/Cellar/mysql/5.6.*/homebrew.mxcl.mysql.plist ~/Library/LaunchAgents/

DevByStarlight says: October 30, 2013 at 6:01 pm

Suggestion for your installation process.

Optionally Execute “mysql_secure_installation”

Particularly if the the mysql install will be used in a production environment … or quasi-production “in house” environment.

Side note: The symlink mentioned in procedures … OSX may tend to wipe the /tmp dir contents on a system reboot.

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