"bin/rails: No such file or directory" w/ Ruby 2 & Rails 4 on Heroku

ghz 1years ago ⋅ 4428 views

Question

While following the Rails 4 Beta version of Michael Hartl's [Ruby on Rails Tutorial](http://ruby.railstutorial.org/ruby-on-rails-tutorial- book?version=4.0#top) , my app fails to start on Heroku, but runs fine locally with bundle exec rails server. Checking heroku logs -t reveals the following error:

$ heroku[web.1]: State changed from crashed to starting
$ heroku[web.1]: Starting process with command `bin/rails server 
-p 33847 -e $RAILS_ENV`
$ app[web.1]: bash: bin/rails: No such file or directory
$ heroku[web.1]: Process exited with status 127
$ heroku[web.1]: State changed from starting to crashed
$ heroku[web.1]: Error R99 (Platform error) -> Failed to launch the 
dyno within 10 seconds
$ heroku[web.1]: Stopping process with SIGKILL

If I heroku run bash and check the bin directory, I can see that there is not a rails executable:

~$ ls bin
erb  gem  irb  node rdoc  ri  ruby  testrb

What have I done wrong? I followed the tutorial exactly.

Answer

After struggling with this for a bit, I noticed that my Rails 4 project had a /bin directory, unlike some older Rails 3 projects I had cloned. /bin contains 3 files, bundle, rails, and rake, but these weren't making it to Heroku because I had bin in my global .gitignore file.

This is a pretty common ignore rule if you work with Git and other languages (Java, etc.), so to fix this:

  1. Remove bin from ~/.gitignore
  2. Run bundle install
  3. Commit your changes with git add . and git commit -m "Add bin back"
  4. Push your changes to Heroku with git push heroku master
#ruby