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Heroku Cloud Application Development

By : Anubhav Hanjura

5 (1)

Heroku Cloud Application Development

5 (1)

By: Anubhav Hanjura

Overview of this book

An easy-to-follow, hands-on guide that clearly explains the various components of the Heroku platform and provides step-by-step guidance as well as numerous examples on how to build and troubleshoot robust and scalable production-ready web applications on the Heroku platform. This book is intended for those who want to learn Heroku the right way. Perhaps you are new to Heroku or are someone who has heard about Heroku but have not built anything significant with it. You should have knowledge or familiarity with cloud computing and basic knowledge of database and network deployment.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Hello Heroku

1. Hello Heroku

What is cloud computing?

Cloud service models

What is cloud application development?

Key advantages of cloud application development

Introducing Heroku

Walking down the memory lane

An overview of Heroku's architecture

The Heroku feature set

Test driving Heroku

Summary

2. Inside Heroku

2. Inside Heroku

The Heroku platform stack

Request routing in Heroku

Heroku's logging infrastructure – the Logplex system

The Heroku add-on architecture

Programmatically consuming Heroku services

The Heroku process architecture

Running applications locally

Setting local environment variables

Process formation

Running a one-off process

Running anything

Summary

3. Building Heroku Applications

3. Building Heroku Applications

Heroku's guiding influence – the Twelve-Factor App methodology

Creating a Heroku application

Configuring your Heroku application

Introducing buildpacks

The slug compiler

Summary

4. Deploying Heroku Applications

4. Deploying Heroku Applications

Deployment on Heroku

Getting a Heroku account

Installing the toolbelt client kit

Logging into the Heroku account

Writing your application

Pushing your application to Heroku

The Git vocabulary

Creating a Heroku remote

Renaming an application

Sending code to Heroku

Optimizing slug size

Cloning existing Heroku applications

Forking an application

Transferring Apps

Optimizing deployments

The choice of a region

Tracking application changes

Release management

Summary

5. Running Heroku Applications

5. Running Heroku Applications

The Heroku app lifecycle

The Heroku CLI

Running your cloud apps locally

The Apps page

Summary

6. Putting It All Together

6. Putting It All Together

Heroku's support for Java

Integrating Eclipse with Heroku

Managing Heroku apps in Eclipse

Summary

7. Heroku Best Practices

7. Heroku Best Practices

The One Cloud development platform

Heroku and the data store

Creating a Heroku Postgres database

Disaster recovery in Heroku PostgreSQL

High availability Postgres

When does Heroku Postgres failover?

Configuring domains the right way

Optimizing applications

Managing your app dynos

Using the Heroku scheduler

Using NewRelic to keep the dyno alive

Summary

8. Heroku Security

8. Heroku Security

Overview

Communication between the developer's machine and the Heroku platform

Application security tools

Summary

9. Troubleshooting Heroku Applications

9. Troubleshooting Heroku Applications

The need for troubleshooting

Your window to the running app – the logs

Techniques for troubleshooting your app

A recommended Heroku configuration

Maintenance windows

Error classification in Heroku

Summary

10. Advanced Heroku Usage

10. Advanced Heroku Usage

Experimenting with Heroku Labs

Introducing Websockets

Heroku and Websockets

Your first Heroku Platform API call

Sharing your app on Heroku

Summary

Index

Index

The Heroku add-on architecture

Add-ons are one way to extend the capabilities of a Heroku application. The user can add a new service such as caching or data storage to the app by provisioning an add-on and consuming the service offered. Heroku users have two ways to provision the add-ons:

The add-on marketplace
The Heroku toolbelt client

The entire process of add-on provisioning and consumption is shown in the following diagram:

The following steps describe how a new add-on is provisioned and consumed by the Heroku app:

The Heroku user requests an add-on using either of the two ways indicated in the previous paragraph.
Heroku sends a provisioning request for the current account to the service provider for the given service.
The service provider validates the request and creates a private resource for the caller and returns a URL that specifies the exact location and the credential required to access the service.
For example, the Amazon RDS service provider might return:
MYSQL_URL=mysql://user:pass...

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