Team – Durgesh, Rohit,

Pankaj10th Feb 2017

WEEKLY TECH SESSION – 1

AgendaWeb app architectureDevice app architecture?What is Rest API?How mobile applications interact with web?List of storage in web/deviceWhat and How is Heroku.com? Configuration of Heroku on Ubuntu.Create a web app with rest api and deploy it to HerokuCreate a device app and use of rest api provided by web

Web app architecture

When deciding which server architecture to use for your environment, there are many factors to consider, such as performance, scalability, availability, reliability, cost, and ease of management.

Here is a list of commonly used server setups, with a short description of each, including pros and cons. Keep in mind that all of the concepts covered here can be used in various combinations with one another, and that every environment has different requirements, so there is no single, correct configuration.

Web app architecture

1. Everything On One Server The entire environment resides on a single server. For a typical web application, that would include the web server, application server, and database server. A common variation of this setup is a LAMP stack, which stands for Linux, Apache, MySQL, and PHP, on a single server.

Web app architecture3. Load Balancer (Reverse Proxy) / 3 Tier

Load balancers can be added to a server environment to improve performance and reliability by distributing the workload across multiple servers. If one of the servers that is load balanced fails, the other servers will handle the incoming traffic until the failed server becomes healthy again. It can also be used to serve multiple applications through the same domain and port, by using a layer 7 (application layer) reverse proxy.

Web app architecture

Web Servers

o Nginxo Apache HTTPo IISo Lighttpdo Apache Tomcat

App Servers

o Phusion Passengero WebSphereo GlassFisho JBoss

Database Servers

o MySQLo MS-SQLo PostgreSQLo MongoDBo OracleDBo SQLite

How web request and response works

Client (PC / Mobile)

Server ComputerInternet

HTTP Request(http://example.com/sign-in)

HTTP Response(http://example.com/sign-in)

HTML Web Page

Main web communications protocol: HTTP – Hypertext Transfer Protocol

Clicking on a hyperlink or typing a URLInto a browser starts a request-response cycle

Device app architecture

DB

What is REST API?

• REST stands for Representational State Transfer. (It is sometimes spelled "ReST".)

• A REST API defines a set of functions which developers can perform requests and receive responses via HTTP protocol such as GET and POST.

HEROKU?

http://www.heroku.com

• Node• Ruby• Java• PHP• Python• Go• Scala• Clojure

Heroku is a cloud platform as a service (PaaS) that lets companies build, deliver, monitor, and scale apps.

INSTALL HEROKU TOOLBELTOn

UBUNTU

wget -O- https://toolbelt.heroku.com/install-ubuntu.sh | sh

https://devcenter.heroku.com/articles/heroku-cli

Configure Heroku Toolbelt with your Account

> heroku login

Configure heroku repo url with your rails project

> git remote add heroku <heroku-repo-url>

Deploy your code

> git add .; git commit –m <message>; git push heroku master;

Configure heroku repo url with your rails project

> git remote add heroku <heroku-repo-url>

Migrate database

> heroku run rake db:migrate

Open heroku app

> heroku open

Thank you