Deploying Rails App On Ec2

Deploying Rails app on Amazon EC2 By: Manik Juneja Akhil Bansal

Introduction
Manik Juneja
[email_address]
http://fromdelhi.com
Akhil Bansal
[email_address]
http://webonrails.com

Intended audience
We assume that you are aware of:
Amazon Simple Storage System(S3)
Basic Ruby and Rails
Deployment tool “Capistrano”
Rails deployment with Apache and Mongrel Clusters

What is Amazon EC2?
EC2 stands for Elastic Compute Cloud
A Beta web service from Amazon
Provides resizable compute capacity in the cloud
Makes on-demand web computing easier

What Amazon Gives?
Hardware
CPU capacity of 1.0-1.2 GHz 2007 Opteron
Instances with 1.7, 7.5 and 15 GB memory.
Internet & Intranet
Power
Public Amazon Machine Images(AMIs)

No Backup and Restore Services But

Deploying Rails app on EC2

Run your instance and:
Install Ruby and Rubygems
Install Rails and other required gems
Install Webserver
Install DBMS and create DB
Write Capistrano Script

Use a rubyforge project “ec2onrails”

We'll use ruby gem “EC2 on Rails”
Developed by a Canadian developer Paul Dowman
http://pauldowman.com/
EC2 on Rails's AMI

Features of the EC2onrails AMI:
Ubuntu 7.10 “Gutsy”
MySQL 5
Ruby 1.8.6
Ruby on Rails 1.2.5
Automatic backup of MySQL database to S3.
Amazon AMI tools installed
32-bit and 64-bit images available

Lets Deploy
gem install ec2onrails
Put Capfile in the RAILS_ROOT
Put deploy.rb and s3.yml in the config
export JAVA_HOME= <PATH>
Signup for S3 and Amazon EC2
mkdir /home/akhil/.ec2
Put X.509 certificate and private key in .ec2

Cont...
Download the Amazon EC2 Command-Line Tools
export EC2_HOME= <path-to-tools>
export PATH=$PATH:$EC2_HOME/bin
export EC2_PRIVATE_KEY=~/.ec2/ private_key
export EC2_CERT=~/.ec2/ certificate

Cont...
Generate a Keypair:
ec2-add-keypair gsg-keypair
The private key returned needs to be saved in a local file so that you can use it later

Cont...
Running an Instance:
ec2-run-instances ami-86c025ef -k gsg-keypair
RESERVATION r-64f61f0d 110620076136 default
INSTANCE i-b1b740d8 ami-86c025ef pending gsg-keypair 0 m1.small 2007-12-05T06:15:38+0000

Cont...
ec2-describe-instances i-b1b740d8
INSTANCE i-b1b740d8 ami-86c025ef
ec2-67-202-1-178.z-2.compute-1.amazonaws.com
domU-12-31-35-00-49-A2.z-2.compute-1.internal
running gsg-keypair 0 m1.small
2007-12-05T06:15:38+0000

Cont...
Authorizing Network Access to Your Instances
ec2-authorize default -p 22
ec2-authorize default -p 80

Cont...
Connecting to your Instance
ssh -i id_rsa-gsg-keypair [email_address]
passwd admin
passwd app

Cont...
Modify s3.yml
Modify deploy.rb
cap ec2onrails:setup
cap deploy:migration s

Cont...
Other capistrano tasks
ec2onrails:db:archive
ec2onrails:db:restore
ec2onrails:db:create
ec2onrails:db:drop
ec2onrails:db:recreate
ec2onrails:db:set_root_password
ec2onrails:ami_ids - Shows the AMI id’s of the images that match the current version of the gem.
ec2onrails:setup - This is a convenience task to get a new instance completely set up in one step, everything except deploying the app.
ec2onrails:restore_db_and_deploy - Another convenience task to recreate the db, restore data to it from an s3 bucket and deploy the app, useful to set up a staging server.

Public IP Your Instances
wget http://169.254.169.254/latest/meta-data/public-ipv4 from your Instance

Terminating Your Instances
ec2-terminate-instances i-b1b740d8
INSTANCE i-b1b740d8 ami-86c025ef
ec2-67-202-1-178.z-2.compute-1.amazonaws.com
domU-12-31-35-00-49-A2.z-2.compute-1.internal
shutting-down gsg-keypair 0 m1.small
2007-12-05T06:15:38+0000

Check status of instances
ec2-describe-instances
INSTANCE i-b1b740d8 ami-86c025ef terminated
gsg-keypair 0 m1.small 2007-12-05T06:15:38+0000

Run and Manage Instances online
We know this one service which let us mange instances online:
RightScale.com

Benefits
Ability to Start, terminate, and monitor instances, using the web service APIs.
Free Data transferred within the Amazon EC2 environment, or between Amazon EC2 and Amazon S3
Pay for the instance-hours and bandwidth that you actually consume.

Points to consider:
Data loss when instance is terminated
Instance gets a new public IP when started again
Need to use third party Dynamic DNS service, like “easydns.com”.

Thanks

http://vinsol.com	119
http://webonrails.com	112
http://therailshosting.com	67
http://teamco-anthill.blogspot.com	46
http://www.slideshare.net	24
http://www.vinsol.com	14
http://www.webonrails.com	6
http://updatelog.vinsol.com	2
http://blog.rubyonrails.co.in	1
http://74.125.45.132	1
http://www.therailshosting.com	1
http://www.xianguo.com	1
http://72.14.205.104	1
http://mail.vinsol.com	1
http://203.208.37.104	1
http://teamco-anthill.blogspot.co.uk	1

Deploying Rails App On Ec2

by Akhil Bansal on Dec 09, 2007

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Deploying Rails App On Ec2 — Presentation Transcript