Ruby on Rails 3 Can't connect to local MySQL server through socket '/tmp/mysql.sock' on OSX

Question

I have a standard Rails3 environment, RVM 1.2.9, Rails 3.0.5, Ruby 1.9.2p180, MySQL2 Gem 0.2.7, mysql-5.5.10-osx10.6-x86_64

Error I get when running rake db:m

Answer 1

On my machine mysqld service stopped that's why it was giving me the same problem.

1:- Go to terminal and type

sudo service mysqld restart

This will restart the mysqld service and create a new sock file on the required location.

Answer 2

The default location for the MySQL socket on Mac OS X is /var/mysql/mysql.sock.

Answer 3

I have had the same problem, but none of the answers quite gave a step by step of what I needed to do. This error happens because your socket file has not been created yet. All you have to do is:

1. Start you mysql server, so your /tmp/mysql.sock is created, to do that you run: mysql server start
2. Once that is done, go to your app directory end edit the config/database.yml file and add/edit the socket: /tmp/mysql.sock entry
3. Run rake:dbmigrate once again and everything should workout fine

Answer 4

Found it!

Change host: localhost in config/database.yml to host: 127.0.0.1 to make rails connect over TCP/IP instead of local socket.

development:
  adapter: mysql2
  host: 127.0.0.1
  username: root
  password: xxxx
  database: xxxx

Answer 5

If you are on Mac OSX,

The default location for the MySQL Unix socket is different on Mac OS X and Mac OS X Server depending on the installation type you chose

MySQL Unix Socket Locations on Mac OS X by Installation Type

• Package Installer from MySQL ------------------/tmp/mysql.sock

---

• Tarball from MySQL -------------------------------/tmp/mysql.sock

---

• MySQL Bundled with Mac OS X Server -------/var/mysql/mysql.sock

So just change your database.yml in socket: /tmp/mysql.sock to point to the right place depending on what OS and installation type you are using

Answer 6

With my installation of MAMP on OSX the MySQL socket is located at /Applications/MAMP/tmp/mysql/mysql.sock. I used locate mysql.sock to find my MySQL socket location.

So my config/database.yml looks like:

development:
  adapter: mysql2
  host: localhost
  username: root
  password: xxxx
  database: xxxx
  socket: /Applications/MAMP/tmp/mysql/mysql.sock