AWS BASICS

Cloud Concepts :

Cloud Services :

In general these are called as Hosted Services and broken into three categories :

1. IaaS - Infrastructure as a Service.
2. PaaS - Platform as a Service.
3. SaaS - Software as a Service.

Difference between these three services lies in level of abstraction and Virtualization provided.

There are many components which comes into picture when we are talking about.  They are

 Low Level Components         (Low Level Components)

             Servers ,  Load Balancers  , File Storage , Networking.

Components relies on Low level components (Mid Level Components)

             Runtime (Language used to code)
             OS   (Os that runs on Load balancers and servers.)

On top of all : (High Level Components)

Application Data
Data

In order to do rapid administration and rapid application development .

Cloud came into picture.


IaaS provides services for Low Level Components.

PaaS provides services for Low Level and Mid Level Components.

SaaS provides services for Low , Mid and High Level Components.

How To Install Scala On MACOS

How to Install Scala on macOS

Step 1: Check for installation of Java Development Kit (JDK)

From a Terminal window, type:

$java –version

If it is already installed, skip to step 4.

Otherwise, download and install the JDK from http://www.oracle.com/technetwork/java/javase/

downloads/index-jsp-138363.html.

Step 2: Set environment variables for Java

export JAVA_HOME=/usr/local/java-current

export PATH=$PATH:$JAVA_HOME/bin/

Step 3: Verify install

Close and re-open the Terminal window, and type:

$java –version

Sample results

java version "11.0.3" 2019-04-16 LTS

Java(TM) SE Runtime Environment 18.9 (build 11.0.3+12-LTS)

Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.3+12-LTS, mixed mode)

Step 4: Install Scala and SBT

To install, you must have an installation manager such as Homebrew (available at homebrew.sh).

From a Terminal window, type:

$ brew install scala

$ brew install sbt

Step 5: Add Scala to environment variables

To set up your environment variables on a Mac, you need to add these commands to your .bash_

profile file, which is located in your home directory. (Note: make sure that you don’t have hidden

files selected.)

export SCALA_HOME=/usr/local/share/scala

export PATH=$PATH:$SCALA_HOME/bin

Close and re-open the Terminal window, and type the following to verify the install: scala -version

Spring Microservices

Microservices became a popular choice for implementing applications which need to be highly scalable , reliable and deployable.


Many high scale systems started moving towards Microservices architecture.

Ex : Amazon , Netflix , Uber , LinkedIn, Twitter etc...


Spring Framework provides required components and environment for developing microservices in a simple and easy way.

We will learn creating , packaging and deploying microservices using spring boot and spring cloud.