Dreamhost run Ruby 1.8.7 which is over 3 years old. Criminal! 

Here’s what I had to do to upgrade to Ruby 2.0.

First of all, Ruby 2.0 is production ready. So, no need to worry about whether to go for 1.9.3. 

1. login as a sudo user (create one via the VPS > Admin Users section if you don’t have one)

i.e. login with your normal web user shell account and type `sudo your_sudo_user` 

2. get the latest version of rvm 

Note that this will not work as Dreamhost has a sudo user which cannot access files of the user that owns the files that sit in your webserver directory: 

rvm get stable 

So, use: 

\curl -L http://get.rvm.io | bash -s stable 

and then

source  

/home/your_sudo_user/.rvm/scripts/rvm 

3. run 

rvm requirements ruby-2.0.0 

You’re now done as your sudo user. Type `exit` to logout back into your original shell. 

4. you can’t write to rvm under your normal user so set rvm autolibs to read: 

rvm autolibs read 

and 

rvm install 2.0 

rvm use 2.0

5. Check stuff is set up correctly:

gem env gemhome

find $MY_RUBY_HOME -name psych.so

and you’re done. 

ruby -v
ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux] 

These help:

http://cheat.errtheblog.com/s/rvm