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Forked from monicao/
Last active Aug 29, 2015
What would you like to do?
Setting up your own Ruby Dev Environment on a Mac

Setting up the Ruby dev environment on Mavericks

... should work on Yosemite as well. Add a comment here if you find any problems.

Why would I want to do that?

  • You want to run guard
  • You want use Sublime plugins (like RSpec or Guard plugins)

1. Installing brew

Brew aka Homebrew is a package management system for Mac OSX. You can think of it as a command line version of the App Store.

Open up the Mac Terminal and run this command to install brew on your mac:

ruby -e "$(curl -fsSL"

After brew is done installing run

brew update

2. Install ruby through rvm

Open a terminal window. Run this command to download an install rvm and the latest version of ruby.

\curl -sSL | bash -s stable --ruby

In the latest version of ruby you might see this error: "Empty path passed to certificates update, functions stack". There is a bug in rvm. Run rvm reinstall 2.1.3 --disable-binary.

Close the current terminal window and open a new one.

rvm list # shows you all the versions of ruby installed on your computer
rvm -h # shows you the help menu with all the commands you can run

3. Install Ruby 2.1.1 and set it as the default version

# Install ruby version 2.1.1
rvm install 2.1.1
# this will take a while... rvm is downloading and installing ruby

# Tell rvm to use 2.1.1 as the default version of ruby
rvm --default use 2.1.1

# Check that you are using the latest version of ruby
ruby -v
# Should show ruby 2.1.1

4. Install rails

Install rails on your system so you can create new rails projects.

gem install rails

And now we can verify Rails is installed:

rails -v
# Rails 4.1.1

5. Install the Postgres database server

Install the server

brew install postgresql

Initialize the database

initdb /usr/local/var/postgres -E utf8

Get postgres to start automatically when your computer starts.

First, figure out which version of postgres was installed by brew.

cd /usr/local/Cellar/postgresql/
# There should be a folder in here with the version number

Then, run the code below, replacing 9.2.1 with your version of postgresql.

mkdir -p ~/Library/LaunchAgents
cp /usr/local/Cellar/postgresql/9.2.1/homebrew.mxcl.postgresql.plist ~/Library/LaunchAgents/
launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist


6. Install the pg gem

gem install pg

Note: This might fail. If it does, ask a TA or add a comment to this gist.

7. Install the command line developer tools

If you have XCode < 5.1.1

The nokogiri gem needs these. See here for details:

xcode-select --install

If you have XCode > 5.1.1

Follow these instructions:

  1. Open XCode
  2. Click on Xcode > Open Developer Tools > More Developers Tools This will take you to the Downloads for Apple Developers web site. Use your AppStore Id to login.
  3. Download Command Line Tools for your Mac OS X version. (Probably Mavericks April / March 2014).

See if it worked

gem install nokogiri

8. Install the gems for a Rails project

  cd /Users/monica/lighthouse/laser_shark
  bundle install

Follow the other setup instructions for that rails app. For laser_shark, you will have to edit your /etc/hosts, for example.

9. Change database.yml

You will need to update the database connection settings for all your Rails applications. In config/database.yml, make sure you have the following settings for the development and test environments. Of course, replace rotten_mangoes with the name of your rails app.

  adapter: postgresql
  database: rotten_mangoes_development
  host: localhost
  encoding: unicode

  adapter: postgresql
  database: rotten_mangoes_test
  host: localhost
  encoding: unicode

To check if the database connection settings work, see if you can create the database.

bin/rake db:create


Could not connect to server: Connection refused

If you see this error, make sure Postgres database is started.

SYS:laser_shark SYS$ bin/rake db:create
could not connect to server: Connection refused
Is the server running on host "localhost" ( and accepting
TCP/IP connections on port 5432?
could not connect to server: Connection refused
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
could not connect to server: Connection refused
Is the server running on host "localhost" (fe80::1) and accepting
TCP/IP connections on port 5432?
/Users/SYS/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/activerecord-4.1.1/lib/active_record/connection_adapters/postgresql_adapter.rb:881:in `initialize'

XCode: Can't install software because it's not currently available on your computer

You probably have XCode 5.1.1 or higher and tried to install the command line tools via command line. See Install the command line developer tools section above.

Help Improve this

I wrote this down from memory. If any of the steps here don't work, please fork this gist, fix the issue and share with the class.

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