ruby-on-rails – heroku db：migrate aborted

我是 Ruby on Rails和heroku的新手.我按照视频教程中的步骤进行操作.我认为我没有做任何不同的事情.但是,我无法在heroku上运行rake db：migrate,而一切都在我的localhost：3000上运行
您还可以详细说明GEMFILE.lock和GEMFILE的功能.

$heroku run rake db:migrate
Running `rake db:migrate` attached to terminal... up,run.9550
DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile,or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/Rakefile:7)
DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile,or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/Rakefile:7)
Connecting to database specified by DATABASE_URL
rake aborted!
could not translate host name "ec2-54-225-69-193.compute-1.amazonaws.com" to address: Temporary failure in name resolution
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1216:in `initialize'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1216:in `new'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1216:in `connect'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:324:in `initialize'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:28:in `new'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:28:in `postgresql_connection'

我的GEMFILE的相关内容

group :production do
  gem 'pg'
end

group :development,:test do
  gem 'sqlite3'
end

我的GEMFILE.lock的相关内容

sqlite3 (1.3.7)
    thor (0.18.0)
    tilt (1.3.6)
    treetop (1.4.12)
      polyglot
      polyglot (>= 0.3.1)
    tzinfo (0.3.37)
    uglifier (1.3.0)
      execjs (>= 0.3.0)
      multi_json (~> 1.0,>= 1.0.2)

PLATFORMS
  ruby

DEPENDENCIES
  coffee-rails (~> 3.2.1)
  jquery-rails
  pg
  rails (= 3.2.13)
  sass-rails (~> 3.2.3)
  sqlite3
  uglifier (>= 1.0.3)