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Migrating your Rails programs to a new server
The first order of business of course, is to make sure that your new server has all the gems installed
which were setup on your old server. If you don't do this, you'll end up with error messages such as
the following:
=> Booting Mongrel (use 'script/server webrick' to force WEBrick)
=> Rails application starting on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
** Starting Mongrel listening at 0.0.0.0:3000
** Starting Rails with development environment...
Exiting
/opt/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/servers/mongrel.rb:15: warning: already initialized constant OPTIONS
/opt/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/servers/mongrel.rb:19: undefined method `options' for []:Array (NoMethodError)
from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:32:in `gem_original_require'
from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:32:in `require'
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:495:in `require'
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:342:in `new_constants_in'
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:495:in `require'
from /opt/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/server.rb:39
from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:27:in `require'
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:495:in `require'
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:342:in `new_constants_in'
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:495:in `require'
from script/server:3
Unfortunately, this error message is a bit mysterious and usually doesn't indicate which modules need to be installed. The
best solution is to first note down the list of gems that were installed in your old server. You can do this by running
the following command on your old server:
gem list
Note down the list of installed gems on your old server. Then go to your new server and add the necessary gems. Note that
some gems may need some other third party programs (for instance, gbarcode requires imagemagick and libgd installed as well)
Don't forget to update your installed gems to the latest version:
gem update --include-dependencies
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