Why Can't I Connect to My Local MySQL Server in Ruby on Rails 3?

Resolving Connection Issues to Local MySQL Server in Ruby on Rails 3

Encountering the error message "Can't connect to local MySQL server through socket '/tmp/mysql.sock'" while attempting database migration in Ruby on Rails 3 raises concerns.

To troubleshoot this issue, let's examine your configuration settings and identify potential causes.

Retrieving the Socket File:

To ascertain the location of your socket file, execute the following command:

mysqladmin variables | grep socket

This command should provide you with a result similar to:

| socket                                            | /tmp/mysql.sock                                                                                                        |

Updating the database.yml Configuration:

Based on the socket file path obtained above, modify your config/database.yml file to include the following line:

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

Ensure that the path specified in the "socket" key matches the result obtained from the grep command.

By specifying the socket file location explicitly, Rails will be able to establish a connection to your local MySQL server. Repeat the "rake db:migrate" command to reattempt the database creation process.

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