Ruby Kernel for Jupyter Notebook

Jupyter notebooks are nice way to keep your code, diagrams, documentation together, mostly in a single file, which is also executable i.e. can run/interpret your code in it, and also have the result saved as it is. Here’s blogpost for installing Jupyter Notebook – today I’ll share how to use Ruby kernel with Jupyter Notebook i.e. executing Ruby code inside the notebooks.
To create notebooks that can execute Ruby code we need to integrate Ruby kernel, the 3 simple steps are:
  • Install Jupyter
  • Install Ruby
  • Install iruby

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Install latest Ruby version using rbenv

Ruby is a dynamic, open source programming language with a focus on simplicity and productivity. Yukihiro “Matz” Matsumoto created it in the mid-1990s, using his influence from other prpgramming languages i.e. Perl, Ada, Lips, Eiffel, and Smalltalk. Ruby was released in 1995. Like Python (released few years earlier), ruby also has dynamic typing and implicit memory management

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Install Jupyter Notebook

What is Jupyter Notebook

If you’re a Python developer, or someone who has to interact with Python, you may be hearing or seeing the term Jupyter Notebook quite lot, while reading articles, or looking for some solution on-line.
The Jupyter Notebook is an open-source web application that allows you to create and share documents that contain live code, equations, visualizations and explanatory text. Uses include: data cleaning and transformation, numerical simulation, statistical modeling, machine learning and much more.

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Anaconda on CentOS 7.x

What is Anaconda

Anaconda is a free open-source Python distribution (as well as R programming language), intended for large-scale data processing and  analysis, and scientific computing. Anaconda Python  distribution is manged and developed by Continuum Analytics.
Anaconda (“Anaconda Distribution”) is a free, easy-to-install package manager, environment manager, Python distribution, and collection of over 720 open source packages with free community support. Hundreds more open source packages and their dependencies can be installed with a simple “conda install [packagename]”. It’s platform-agnostic, can be used on Windows, OS X and Linux. Or even easier.

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conda VS pip

I decided to write this post, as I myself when for the first time tried to use conda (the package manager for Anaconda Python distribution, the first question was in what ways conda is better then pip, and so why one should think of preferring condo over the de-facto pip. Here I have put a comprehensive post about ‘getting started with conda’ i.e. what extra condo can offer.

A short comparison

pip
  • Can only be used for Python packages.
  • The supported package manger by the Python foundation, hence widely used.
conda
  • Handles library dependencies even outside Python i.e. packages for C libraries, or R packages, or really anything.
  • Supports virtual environment out of the box.
  • Developed to be used with Anaconda Python distribution, though can be used with the standard Python distribution – but highly not recommended.

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Elasticsearch with Python

Start here:

Elasticsearch is a distributed storage and real-time search engine.
  • Distributed storage – you just need to setup and add Elasticsearch nodes, it’ll keep the data distributed on the cluster nodes. The distributed-ness makes data durable and highly-available too.
  • Real-time search engine – You can get to query the data the moment it’s been written.
Due to the above 2 attributes you have been listening and reading about Elasticsearch, wherever there’s a discussion of real-time data analysis. It’d not be an overstatement to say technologies like Elasticsearch set the foundation for any efficient and reliable search engine.
The ES itself is implemented in Java, but it provides a good RESTful api interface which makes it possible to use it with any programming language.

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Docker 101 – Getting started with Docker

What is Docker

As per Docker’s website
Docker is an open platform for developers and sysadmins to build, ship, and run distributed applications, whether on laptops, data center VMs, or the cloud.”
Docker is basically, based on operating-system-level virtualization
Operating-system-level virtualization is a server-virtualization method where the kernel of an operating system allows for multiple isolated user-space instances, instead of just one. Such instances (sometimes called containerssoftware containers, virtualization engines (VE), virtual private servers (VPS), or jails) may look and feel like a real server from the point of view of its owners and users.”

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Install Ansible on CentOS 7

For an overview of what is Ansible – Getting started with Ansible

For this tutorial we are using 3 VMs, with IPs and hostnames – one Ansible controller/manager (ansible-controller) which will be doing the provisioning on the two remote servers i.e. ansible-node1 and ansible-node2:
192.168.40.192 ansible-controller
192.168.40.193 ansible-node1
192.168.40.194 ansible-node2
ansible-controller‘ is the manger node, the one performing the provisioning on the rest of the hosts i.e. on ansible-controller we’ll be installing and configuring Ansible.

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