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Rails 6 setup in macOS Monterey

Rails 6 setup in macOS Monterey

It's a 4 minute read

My previous setup tutorials seemed to help a few people setup their Rails environment so I decided to create this updated version for the recently released macOS Monterey.

Install NodeJS

Before we start you will need to make sure you have installed NodeJS. If you visit the NodeJS site at https://nodejs.org/ and download and install the LTS package. Once you have done this we can move on.


Next up we need to install Homebrew it comes with a very simple install script. During install you may be asked you to install Xcode Command Line Tools, if so just say yes.

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"


With Homebrew installed we can now move on to installing Ruby, the current version at time of writing this is (2.7.0). You will need to enter the following commands into your terminal window.

# Install Ruby.
rbenv install 3.0.2

# Set our main version to the latest version.  
rbenv global 3.0.2

# Check our ruby version.
ruby -v


Oh-my-ZSH is a fantastic tool for managing your zsh configuration

sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"
nano ~/.zshrc

at the bottom add the following lines

export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"


I use Git for my version control system, so we’re going to set it up to match our Github account. If you don’t already have a Github account, make sure you register as it will come in handy for the future.

Replace the example name and email address in the following steps with the ones you used for your Github account.

git config --global color.ui true
git config --global user.name “your name”
git config --global user.email “[email protected]”
ssh-keygen -t rsa -C “[email protected]

The next step is to take the newly generated SSH key and add it to your Github account. You want to copy and paste the output of the following command and paste it here.

cat ~/.ssh/id_rsa.pub

Once you’ve done this, you can check and see if it worked:

You should get a message like this:

Hi r3id! You’ve successfully authenticated, but GitHub does not provide shell access.


You now need to install Yarn. Yarn is a JavaScript a fast, reliable, and secure alternative npm client.

brew install yarn

Ride the Rails

Installing Rails is really to install just enter the following command in iTerm2

gem install rails

Rails should now be installed, however for us to use the rails executable, we need to tell rbenv to see it:

rbenv rehash

Now lets just double check to make sure Rails has installed correctly. Run the following command in iTerm2

rails -v

Setting up our database

By default Rails uses SQLite3 while this is adequate for developing locally, you will need something better in production. My personal choice is PostgreSQL, so I will cover installing this. But as a side note, you could always use MongoDB, or even MySQL if you wanted to.

We are going to use Homebrew to install our PostgreSQL server and client so open up iTerm2 and enter.

brew install postgresql

To have “launchd” start postgresql at login, you will need to run the following command

brew services start postgresql

The PostgreSQL default user is normally set to your current macOS username and has no password. Check out the PostgreSQL docs for more info.

Let’s create our first Rails site

Open up an iTerm2 window, and we’ll get Rails to generate our new site which we will call “sample-app”.

rails new sample-app -d postgresql

The command will create a new directory called sample-app and install your Rails app in there. You may have noticed the -d postgresql, well this tells Rails to set the Database to use PostgreSQL. If you were to leave this off, Rails would by default use SQLite3.

Now we change into the directory that we created.

cd sample-app

As a final step, we create the database

rails db:create

Now in a similar method to Jekyll, we run the following command to start up our Rails server.

rails s

You could run rails s or rails server they are both the same thing its more personal preference.

So now you have Rails setup and your server running, all that’s left to do is to visit http://localhost:3000 to view your new Rails app in your browser of choice.

As a final note, you may need to run to install webpacker, which is what Rails now uses to manage the asset pipeline.

rails webpacker:install


© 2023 Alan Reid