Command $rake db:migrate is failing looking for mysql.sock

[hallett]

I'm now at Chapter 5 of Lenz's book trying to use the rake command and I get an error

dave-halletts-computer-2:~/shovell davehallett$ rake db:migrate
(in /Users/davehallett/shovell)
rake aborted!
No such file or directory - /tmp/mysql.sock


When I used the locate mysql.sock command I get the answer back

/private/tmp/mysql.sock

yet when I change to that directory I can't find a mysql.sock file.
Any hints?
Thanks

[Dan Grossman]

Is MySQL running?

[paulgb]

Did you set up the database.yml file for your databases?

[telematter]

It might be that your mysql.sock lives in a different location. For example, on one of my servers it lives in /var/lib/mysql/

Maybe try "updatedb" and then "locate mysql.sock" then update your application's database.yml.