Setup Ruby, ruby-build, rbenv-gemset | Conclusion – Moving micro-services into AWS EC2 instance – Part 3

In this post let’s setup Ruby and ruby gemsets for each project, so that your package versions are maintained.

Install ruby-build # ruby-build is a command-line utility for rbenv

git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build

# Add ruby build path

echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bashrc # OR
echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.zshrc

# load it

source ~/.bashrc # OR
source ~/.zshrc


For Mac users – iOS users


# verify rbenv
curl -fsSL https://github.com/rbenv/rbenv-installer/raw/main/bin/rbenv-doctor | bash

If you are using zsh add the following to `~/.zshrc`

# rbenv configuration
eval "$(rbenv init -)"
export RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.1)"

Install Ruby 2.5.1 using rbenv

rbenv install 2.5.1

rbenv global 2.5.1 # to make this version as default

ruby -v # must display 2.5.1 if installed correctly

which ruby # must show the fully qualified path of the executable

echo "gem: --no-document" > ~/.gemrc # to skip documentation while installing gem

rbenv rehash # latest version of rbenv apparently don't need this. Nevertheless, lets use it to avoid surprises.

gem env home # See related details

# If a new version of ruby was installed, ensure RubyGems is up to date.
gem update --system --no-document


Install rbenv gemset – https://github.com/jf/rbenv-gemset

git clone git://github.com/jf/rbenv-gemset.git ~/.rbenv/plugins/rbenv-gemset

If you are getting following issue:

fatal: remote error:
  The unauthenticated git protocol on port 9418 is no longer supported.
# Fix
 git clone https://github.com/jf/rbenv-gemset.git ~/.rbenv/plugins/rbenv-gemset

Now clone your project and go inside the project folder -Micro-service folder (say my-project) which has Gemfile in it and do the following commands.

cd my-project

my-project $ rbenv gemset init # NOTE: this will create the gemset under the current ruby version.

my-project $ rbenv gemset list # list all gemsets

my-project $ rbenv gemset active # check this in project folder

my-project $ gem install bundler -v '1.6.0'

my-project $ rbenv rehash

my-project $ bundle install  # install all the gems for the project inside the gemset.

my-project $ rails s -e production # start rails server
my-project $ puma -e production -p 3002 -C config/puma.rb # OR start puma server
# OR start the server you have configured with rails. 

Do this for all the services and see how this is running. The above will install all the gems inside the project gemset that acts like a namespace.

So our aim is to setup all the ruby micro-services in the same machine.

  • I started 10 services together in AWS EC2 (type: t3.small).
  • Database is running in t2.small instance with 2 volumes (EBS) attached.
  • For Background job DB (redis) is running in t2.micro instance.

So for 3 ec2 instance + 2 EBS volumes –$26 + elastic IP addresses ( aws charges some amount – $7.4) 1 month duration, it costs me around $77.8, almost 6k rupees. That means we reduced the aws-cloud cost to half of the previous cost.

Author: Abhilash

Hey! This is Abhilash - A Ruby developer, specialised on web development. I am also working on other frameworks such as Angular, Sinatra, Laravel, NodeJS etc. Ruby On Rails is my primary software framework, which I do since 2010. This blog is about Ruby, Ruby On Rails and other subjects that I have had experienced upon. You can contact me here: abhilash.amballur@gmail.com LinkedIn: www.linkedin.com/in/abhilashak

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