The document provides an overview of Heroku, a cloud platform for building and deploying web applications, detailing its process model, deployment stack, and add-on services. Key features include a simplified deployment method via git, independent scaling of components, and a lightweight container system called dynos. The document also outlines usage and billing strategies, including a free tier and various CLI commands for managing applications on the platform.

1. Heroku
By Bhagwat Kumar
http://twitter.com/bhagwatkumar
5th Jan 2013

2. Agenda

Cloud Computing and Heroku

Process Model

Dynos Manifold

Deployment Stack

Add-on Services

Usage and Billing

CLI

3. Cloud Computing and Heroku
Cloud computing is a general term for
anything that involves delivering hosted
services over the Internet.
SAAS
PAAS
IAAS

4. Heroku

a new way of building and deploying web
apps.

Spend 100% of your time on application
code.

Forget managing servers, deployment,
ongoing operations, or scaling.

5. How it works?

Deploy – just a git push

Connect – add 3 party resources
rd

Command – Use CLI/web interface

Observe – All activities logged using Logplex

Scale – independent scaling of components

Relax - takes full responsibility for your app's health.

6. Git with Heroku

7. Process Model

Process Type

Web : web application

Worker : timed jobs and queuing systems

Each app has a set of running processes
and the processes are instantiated using
'Process Type' as prototype.

8. Process Model cont...

9. Dyno

Basic unit of composition on Heroku.

A lightweight container running a single
user-specified command/process.

Possible commands
– Web processes
– Worker processes
– Other processes defined in Procfile

10. Dyno composition

Your app

Framework support

Config vars

Own file system for temp usage

512MB of RAM

11. Dyno Manifold
 Provides an environment for
your app's dynos:
• distributed
• fault-tolerant
• horizontally scalable
 Tasks
• restarting faulty dyno
• checking for idle dyno
• restarting on config change

12. Deployment Stack
A stack is a complete deployment environment
including :

base operating system

language runtime

associated libraries.

13. Popular add-on services

14. Usage & Billing

Usage is computed from wall-clock time,
not CPU time.

Current charge : $0.05 per hour per dyno

Each app gets 750 free dyno-hours/month
– run 1 dyno for an entire month for free
OR
– run 2 dynos for 1/2 of a month

Add-on services have their own charges

16. Get ready
Register here
https://api.heroku.com/signup/devcenter
Install Heroku Toolbelt (CLI) from
https://toolbelt.heroku.com/
Or if you use Ubuntu then :
wget -qO- https://toolbelt.heroku.com/install-ubuntu.sh | sh

17. Sample commands
heroku help
heroku login
heroku create --stack cedar
heroku apps:rename newname
heroku apps:rename newname --app oldname
(http://newname.heroku.com/ | git@heroku.com:newname.git)
git push heroku master
heroku logs -t

18. Sample commands (git)
add heroku remote to existing project
git remote add heroku git@heroku.com:project.git
push different project code on existing heroku app
git push --force heroku master
Deploy git 'yourbranch' instead of master
git push heroku yourbranch:master
Remove heroku remote from the project
git remote rm heroku

19. Sample commands (config)
See all the config available for your project
heroku config
Add a key-value pair to config
heroku config:add COMPANY='Intelligrape Software'
Remove keys from config
sheroku config:remove COMPANY OTHER_VAR
//config variables are available as System properties on heroku.
// in Java/Groovy System.getenv('COMPANY')

20. Sample commands (sharing)
Change owner of the heroku project
heroku sharing:transfer owner@xyz.com
Add collaborator
heroku sharing:add my_email@xyz.com
Remove collaborator
heroku sharing:remove my_email@xyz.com

21. Sample commands (process)
See all running processes
heroku ps
watch heroku ps
Restart all dynos
heroku restart
Run bash shell
heroku run bash

22. Sample commands (add-ons)
heroku addons:list
heroku addons:add heroku-postgresql
heroku pg:wait
heroku addons:remove heroku-postgresql

23. Heroku postgres-db commands
heroku pg:info
heroku pg:credentials COLOR
heroku pg:psql

24. Heroku postgres backup
heroku addons:add pgbackups
heroku addons:add pgbackups:plus #plus plan
heroku addons:add pgbackups:auto-week #auto-week plan
heroku pgbackups:capture #default database backup creation
heroku pgbackups:capture HEROKU_POSTGRESQL_PINK #selected database backup
heroku pgbackups:capture --expire # delete manual oldest backup
heroku pgbackups# see backups b indicates manual and a indicates auto
heroku pgbackups:url b004 # provides a 10 minute backup download public url
heroku pgbackups:destroy b003 # delete a backup
heroku pgbackups:restore DATABASE b251 # restore backup to DATABASE
heroku pgbackups:restore HEROKU_POSTGRESQL_PINK b251 #restore to PINK database

25. Thank you :)