Ruby: Could not find a temporary directory

Question

I am getting some 500 errors in my Passenger Rails app. When looking at the log it appears passenger cannot access the /tmp dir. I have validated that it is there and has

Answer 1

ls -l /

$drwxrwxrw   9 root     root      4096 Jun 26 11:34 tmp

If you don't see that t at the end of the permissions column '/tmp'

chmod o+t /tmp
chmod 1777 /tmp    
$ ls -l / 
drwxrwxrwt   9 root     root      4096 Jun 26 11:35 tmp

reason is Fixing temporary dir problems with Ruby 2