Why Can't I Connect to MySQL on macOS?

Error in Connecting to MySQL Socket with Ruby on Rails 3 on macOS

When attempting to execute 'rake db:migrate' for database creation in a Rails 3 environment, the following error occurs:

Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

Steps to Resolve:

1. Locate the Socket File:

   • Run the command:

     mysqladmin variables | grep socket

   • This command typically returns the path to the socket file, e.g., "/tmp/mysql.sock".

2. Update config/database.yml:

   • Add the following line to the development section of 'config/database.yml':

     socket: /path/to/socket/file

   • Replace "/path/to/socket/file" with the actual path to the socket file obtained in step 1. For example:

     socket: /tmp/mysql.sock

3. Save the changes to 'config/database.yml'.

Additional Notes:

• If the 'socket' option is not explicitly set in 'config/database.yml', Ruby on Rails will attempt to connect to the default socket file, which is "/tmp/mysql.sock" on macOS.
• The error message suggests that there is an issue with connecting to the MySQL server through the default socket file. Adding the 'socket' option to 'config/database.yml' explicitly specifies the socket file to be used.

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