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.

Rbenv: Start with new ruby and rails versions

Check for the new ruby and rails versions
https://www.ruby-lang.org/en/downloads/
https://rubygems.org/gems/rails/versions

Here we are going to install Ruby – 2.4.1 & Rails – 5.1.3

Get rbenv into action
If you are not installed rbenv, you can install it from here:
https://github.com/rbenv/rbenv
After the installation make sure that, your $PATH has included rbenv/shims path. Else rbenv will not work.

1. $ rbenv install --list # Gets the list of ruby versions available

$ rbenv install 2.4.1

ruby-build: definition not found: 2.4.1

The following versions contain `2.4.1' in the name:
  rbx-2.4.1

See all available versions with `rbenv install --list'.

If the version you need is missing, try upgrading ruby-build:

  brew update && brew upgrade ruby-build

Oops..!

rbenv cannot find the version: 2.4.1

Upgrade ruby-build

Mac OSX:

$ brew upgrade ruby-build --HEAD

Now install ruby 2.4.1

$ rbenv install 2.4.1

Create a new gemset:

Rbenv gemset is a separate script and not coming with rbenv. If you are not installed this, you can install it from here:
https://github.com/jf/rbenv-gemset

$ rbenv gemset create 2.4.1 demo-app
That set up a directory for you in ~/.rbenv/versions/2.4.1/gemsets/demo-app

Set the ruby version to the newest

$ rbenv local 2.4.1

$ rbenv version
=> 2.4.1

    Activate New Gemset


For activating a gemset we need to create a .rbenv-gemsets file in the current directory.

$ touch .rbenv-gemsets
$ echo demo-app > .rbenv-gemsets

Check active gemset:

$ rbenv gemset active

Install Rails 5.1.3

$ gem install rails -v '5.1.3'
$ gem install --no-rdoc --no-ri rails -v '5.1.3' # skips the documentation

Later we can delete this .rbenv-gemsets file and add a new file named ‘.ruby-gemset’ in the rails project directory. I cannot find any other option for doing this. If anyone know more about this, please give a comment. I appreciate that.

Create a New Rails app

$ rails new demo-app

$ rm .rbenv-gemsets

$ cd demo-app
$ touch .ruby-gemset
$ echo demo-app > .ruby-gemset
$ touch .ruby-version
$ echo 2.4.1 > .ruby-version
$ rails s
=> Booting Puma
=> Rails 5.1.3 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
Puma starting in single mode...
* Version 3.9.1 (ruby 2.4.1-p111), codename: Private Caller
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:3000
Use Ctrl-C to stop

Goto http://localhost:3000/

rails-5-new.png

Done! Lets go…