Ruby Apps on Cloud Foundry
About Cloud Foundry
- Open Platform As a Service built by VMWARE
- Multi Languages: Ruby, PHP, Python, Java, Javascript, Scala
- Multi Frameworks: Rails, Sinatra, NodeJS, Spring, Grails, Lift
- Multi Services: MongoDB, Redis, RabbitMQ, MySQL, PostreSQL
- Multi Clouds: Infrastructure Independent
- Open Source: http://github.com/cloudfoundry
Open Source
Cloud Foundry Service
Getting Started
Assumptions for Demos
You have RVM installed
You have Ruby 1.9.2 available
Tour Cloud Foundry via VMC
VMC Basics
Install the CLI for Cloud Foundry called VMC. Its packaged as a Ruby gem.
sudo gem install vmc --pre
Log into cloudfoundry.com or any other cloudfoundry instance
vmc target api.cloudfoundry.com
vmc login [username]
Push the code to the cloud
vmc push
VMC is a gem
VMC can be used by any Ruby Application
VMC commands work against any Cloud Foundry instance
Gemfile
source "http://rubygems.org"
gem "sinatra"
gem "shotgun"
gem "json", "~> 1.4.6", :require => "json/pure"
gem "haml"
gem "vmc", "~> 0.3.16.beta.6"
gem "vmc"
Using VMC from Sinatra
At the top of your app.rb include require "vmc/client"
You can then use VMC::Client
Example
get "/apps" do
@vmcclient = VMC::Client.new(@target, @token)
@apps = @vmcclient.apps
haml :apps
end
Packaging Ruby Apps
Use Bundler
Cloud Foundry manages your dependencies using your Gemfile.lock
Run bundle package before deploying to Cloud Foundry
- No download from rubygems.org = faster deployment
Gems downloaded from rubygems.org are cached across CF
Gems are installed into repository local to your app
Ruby Web Frameworks
Sinatra
- Detection of Sinatra apps via
require 'sinatra'
- Runs on Thin or Webrick
Rails
- Supports 3.0, 3.1 and 3.2
- Runs on Thin or Webrick
- Detection of Rails apps via presence of
config/environment.rb
Rack
- Detection via
config.ru
- No web server added
Auto Reconfiguration
- Automatically enabled if there is only one service of a given type
- No need to parse
VCAP_SERVICES and connect to the proper port
- Just deploy and enjoy
If you prefer to DIY
Create config/cloudfoundry.yml with
autoconfig: false
Use cf-runtime gem to make service connections or parse environment
Service tunneling
- Its is common during the development cycle for developers to want to examine the data directly
- Also common to examine data in production for troubleshooting
- With Caldecott, developers have the ability to access any service on Cloud Foundry as if it was running locally
To install
gem install caldecott
To connect
vmc tunnel <service_name>
Make sure you are using addressable 2.2.6
Manifest
- Easily detail all of the resources your application needs to run including
- Very simple yaml file
- Requires 0.3.16.beta.1 or higher
Manifest Example
.:
name: hello-sinatra
instances: 1
framework:
name: sinatra
info:
exec: ruby main.rb
description: Sinatra Application
mem: 128M
url: ${name}-suraci.${target-base}
services:
mysql-2cccd:
type: :mysql
mem: 128M
Rails Demo
Website Prelaunch
Rails Console
- Another tool for examining data in development and production
- Also useful for performing maintenance tasks using Rake (i.e. seed the database)
Example
vmc rails-console mynewblog
irb():001:0> @comment = Comment.find_by_author("Joe")
#<Comment id: 7, post_id: 1, author: "Joe", body: "I have something real...">
irb():002:0> @comment.delete
#<Comment id: 7, post_id: 1, author: "Joe", body: "I have something real...">
irb():004:0> exit
Standalone applications
Brand New to cloudfoundry.com
The “no framework” option
- Choose a runtime and provide a start command
- Choose a URL or “none” if no web port needed
Supports long-running apps
- Investigating support for short-lived tasks and cron
Great for background or asynchronous jobs
Requires vmc 0.3.16.beta.6 or higher
Problems with Monolithic Applications
Lack of scalability
- Scale through replication
- Non-replicable component => nothing can be replicated
- Can’t scale different parts of the application differently
Lack of deployability
- Deploy it all in one go
- Increased risk of something breaking
More Problems with Monolithic Applications
Applications are brittle
- Store can’t accept orders unless all services are available
- Failure (e.g. memory leak) in one component can take down every other
Monolingual
Standalone applications to the rescue!
-
Deploy individual apps as services
-
Be a polyglot programmer!
-
Possible using web frameworks, but standalone support provides more options
Summary of what we did
Got up and running on VMC
Deployed and edited Sinatra app
- Used caldecott to connect to app’s Redis service
Deployed Rails app with MySQL service
Used Rails Console
- Ran rake task to seed DB
- Inspected data
Saw Redis and Resque in action with Standalone Apps
Deployed a polyglot application using standalone Elastic Search
Coming soon?
Ruby 1.9.3
Remote debugging for local cloud
IRB console for other types of Ruby apps
Rails improvements
- Support for
asset pipeline
- Ability to switch modes
- Ability to disable automatic migrations
- Automatic staging of MySQL or Postgres gems for auto-reconfiguration
Bundler/Gem improvements
- Support for platform-conditional gems
- Support for Bundler groups
- Support for
rmagick
Help us make Ruby better on Cloud Foundry
Open source code
- http://github.com/cloudfoundry
Ideas, issues
- http://cloudfoundry.atlassian.net
Sign-up for a free account
- http://www.cloudfoundry.com
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