Rails 4.2 Server port forwarding on Vagrant does not work

Question

I have a Vagrant VM with Rails installed with a sample app. The VM is configured to forward the port 3000 (of Rails Webrick server) to my host 3000 port.

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Answer 1

To run on a specific port :

rails server -b 0.0.0.0 -p 8520

Answer 2

Rails 4.2 now binds to 127.0.0.1 by default and not 0.0.0.0.

Start the server using bin/rails server -b 0.0.0.0 and that should sort it.

Answer 3

You can use an alias, on Ubuntu put it in ~/.bash_aliases
I use:
alias rs="rails server -b 0.0.0.0"

You have to reload the terminal before you can use it

Answer 4

Really nice explanation found here: Rails 4.2.0.beta2 - Can't connect to LocalHost?

I had exactly the same problem, with the exception that my PC is Mac machine. I've used this vagrantfile to get it working (with virtualbox 4.3.36)

# -*- mode: ruby -*-
# vi: set ft=ruby :

VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
  # Use Ubuntu 14.04 Trusty Tahr 64-bit as our operating system
  config.vm.box = "ubuntu/trusty64"

  # Configurate the virtual machine to use 2GB of RAM
  config.vm.provider :virtualbox do |vb|
    vb.customize ["modifyvm", :id, "--memory", "2048"]
  end

  config.vm.provision "shell", inline: <<-SHELL
    ## Install necessary dependencies
    sudo apt-get --assume-yes install libsqlite3-dev libcurl4-openssl-dev git

    ## Install GPG keys and download rvm, ruby and rails
    curl -sSL https://rvm.io/mpapis.asc | gpg --import -
    curl -L https://get.rvm.io | bash -s stable --ruby
    curl -L https://get.rvm.io | bash -s stable --rails
    echo "[[ ls \"$HOME/.rvm/scripts/rvm\" ]] && . \"$HOME/.rvm/scripts/rvm\"" >> ~/.profile
    ## Adding vagrant user to the group that can access rvm
    usermod -G rvm vagrant
  SHELL

  # Forward the Rails server default port to the host
  config.vm.network :forwarded_port, guest: 3000, host: 3000

end

after having the VM up and running, I would run bundle install in my project repo and then rails server -b 0.0.0.0. As pointed out in linked answer above:

127.0.0.1:3000 will only allow connections from that address on port 3000, whereas 0.0.0.0:3000 will allow connections from any address at port 3000.

Since Rails 4.2 only accepts connections from localhost by default, you can only access the server from localhost (eg. inside the VM); connections from another machine (eg. VM's host) will not work.

Answer 5

Use:

rails s -b 0.0.0.0

or

Add to config/boot.rb:

require 'rails/commands/server'

module Rails
  class Server
    new_defaults = Module.new do
      def default_options        
        default_host = Rails.env == 'development' ? '0.0.0.0' : '127.0.0.1'
        super.merge( Host: default_host )
      end
    end

    # Note: Module#prepend requires Ruby 2.0 or later
    prepend new_defaults
  end
end

and work with rails s