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.

Setup Zsh, NVM, Rbenv | Moving micro-services into AWS EC2 instance – Part 2

In this post let’s continue to install the other packages.

Install Oh my zsh.

sh -c "$(curl -fsSL https://raw.github.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"
sudo reboot

Make sure that ~/.zshrc contains the following lines.

# Path to your oh-my-zsh installation.
export ZSH="$HOME/.oh-my-zsh"

# See https://github.com/ohmyzsh/ohmyzsh/wiki/Themes
ZSH_THEME="robbyrussell"

# Example format: plugins=(rails git textmate ruby lighthouse)
# Add wisely, as too many plugins slow down shell startup.
plugins=(git)

source $ZSH/oh-my-zsh.sh

# Rbenv Loader
export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"
export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"

# NVM loader
export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion

Install NVM

sudo apt-get update -y
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.34.0/install.sh | bash
source ~/.bashrc or source ~/.zshrc

Install Rbenv

git clone https://github.com/rbenv/rbenv.git ~/.rbenv

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

echo 'eval "$(rbenv init -)"' >> ~/.bashrc # OR
echo 'eval "$(rbenv init -)"' >> ~/.zshrc

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

type rbenv # to see if rbenv is installed correctly

In this tutorial we have installed nvm for node version managing, rbenv for ruby versions and gemsets. We installed Oh My Zsh before this for better terminal interface with more information. So we use ‘.zshrc‘ file instead of ‘.bashrc‘ file in this machine.

Load all the required configurations to the terminal by adding the above lines of nvm and rbenv to the zshrc file.

Basic Software installation| Moving micro-services into AWS EC2 instance – Part 1

As I mentioned in the previous post, I should move out of micro-services. Solving this I am taking an AWS EC2 instance and configuring every micro-services in this instance. Here I use Ubuntu 16.04 machine, because my application setup is little old. You can take Ubuntu 20.04 if you have newer versions of Rails, Ruby etc.

Our setup includes Ruby on Rails (5.2.1) micro-services (5-10 nos), NodeJS application, Sinatra Application, Angular 9.1 Front-End Application.

Go to AWS EC2 home page and select ubuntu 16.04 machine with default configurations and ssh enabled.

https://ap-south-1.console.aws.amazon.com/ec2/v2/home

Now login to this new instance and install all the packages we needed for our setup.

Software Installation

Update the package list.

sudo apt-get update

Install Ruby dependencies.

sudo apt-get install ruby-dev
sudo apt-get install libxml2-dev
sudo apt-get install libxslt-dev
sudo apt-get install graphviz

Install NodeJS

curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -
sudo apt-get install -y nodejs
node -v

Install yarn and other dependencies.

curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
sudo apt-get update
sudo apt-get install git-core zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev software-properties-common libffi-dev nodejs yarn

Install Mysql 5.7 (Remember this is for Ubuntu 16.04, 18.04 versions)

sudo apt-get install mysql-server-5.7 mysql-client-core-5.7 libmysqlclient-dev
sudo service mysql status # or
systemctl status mysql
username: <your-username>, password: <your-password>

You can also try
mysql_secure_installation, if you use other mysql version.

Note: If you are setting up Ubuntu 20.04 note that there is a big change in mysql and the version of mysql is 8.0 instead of 5.7. If you have applications running in mysql 5.7 then setup and use Ubuntu 16.04 or 18.04.

Let’s continue the installation in our next post.