- Stratos is an open source PaaS platform that provides a full middleware platform as a service with self-service provisioning capabilities. - StratosLive is a PaaS that runs Stratos in the cloud with various subscription plans including a free demo option. - Stratos services can support multiple tenants in the same container for higher efficiency. Services have network APIs and support multi-tenancy through classloader isolation and tenant-based policies. - An elastic load balancer scales services elastically to handle varying workloads from tenants. It uses a custom deployment of WSO2 Synapse to proxy requests across service instances.

1. Advanced Use Cases and Approaches
with WSO2 Stratos
Paul Fremantle
CTO and Co-Founder
www.wso2.com
paul@wso2.com
@pzfreo #wso2

2. Agenda
• This is a follow on to the presentation I gave at Qcon:
– http://freo.me/xhHmkP
• Quick recap
• Understanding the system architecture of Stratos
– Identity model
– Multi-tenancy
– Elastic Load Balancer
• How do new Services fit in?
• How can I multi-tenant existing code?
• Integrating development management into Stratos
• Advanced use cases
• Summary
@pzfreo #wso2 2

3. What should you take away from this
presentation?
• What are Stratos and StratosLive?
• How can I try out Stratos?
– On the Web?
– On your machine?
• How can I extend Stratos?
• Where can an extensible open PaaS give me
competitive advantage?
• Where can I get more information?
@pzfreo #wso2 3

4. Moore’s Law for Data
• The amount of data online went from
– 5 exabytes in 2002
– 281 exabytes in 2009
• Doubling every 15 months
• You cannot deal with this data growth with
the same applications
– A reasonable conclusion is that the number of
applications will double every 15 months too
@pzfreo #wso2

5. Stratos Overview
• Stratos – an Open Source project / product
– A full middleware platform available as a service, with
self service
• Fast provisioning
– Based on OSGi
• Modular, componentized, standard
– Multi-tenant, Elastic, Metered and Billed
• Effective and powerful
– Available under the Apache License
• Open Source, Open License, Open Development
• StratosLive – a Platform-as-a-Service
– Stratos running in the cloud with various plans
• Including a free demo plan
@pzfreo #wso2

6. Stratos resources
• Running on the web
– http://stratoslive.wso2.com
• Stratos SVN
– http://svn.wso2.org/repos/wso2/trunk/stratos/
• Stratos-dev list
– https://mail.wso2.org/cgi-bin/mailman/listinfo/stratos-
dev
• Blog on how to build / install
– http://yumani.blogspot.com/2011/06/setting-up-wso2-
stratos-in-personal.html
@pzfreo #wso2 6

7. Private Cloud Middleware Platform
@pzfreo #wso2

8. StratosLive vs Stratos
• StratosLive contains all the “Services” in a
default / vanilla state
• Stratos can contain:
– More services
• e.g. New services you create
– Fewer services
• e.g. just AS/DSS
– Customized deployments of services
• e.g. ready configured with libraries / APIs / host
objects
@pzfreo #wso2 8

9. Installation options
• 1. Full installation (like StratosLive)
– Pre-reqs
• IaaS – Eucalyptus, vmWare, Ubuntu or Amazon
• MySQL & Perl & JVM
• Ability to run a number of VMs (one per service)
• 2. Laptop/Simple install (on my laptop)
– Pre-reqs
• A machine with lots of memory (4Gb min, 8GB
preferred)
• JVM
• MySQL & Perl
@pzfreo #wso2 9

10. Examples and Case Studies
• System Integrator
– Currently running Stratos for internal projects
– Examining the use of Stratos for customer projects and SaaS
• Home Loan Bank
– WSO2 runs a private deployment of Stratos
– Developer sandbox and test environment
– Currently apps are then deployed internally in Carbon
• Ecosystem PaaS
– Combination of cross tenant services / APIs
– Allow each tenant to deploy / customise the logic
• Mobile PaaS
– Building a PaaS environment for a mobile telco
• SaaS-enablement of legacy applications
@pzfreo #wso2

11. ESB and PaaS example
Tenant Tenant Tenant Tenant
App App App App
Internet
Gateway
(WSO2 ESB
providing
Traffic Core ESB
shaping,
QoS, and LB)
Core Services
@pzfreo #wso2

12. Available Services in Stratos
(a selection)
@pzfreo #wso2 12

13. Every Service has a network API
• All admin functions and all the low level services
are available as SOAP APIs
– Full SOAP support, REST in some cases
– Always possible to bridge into REST using the ESB
• Why?
– Clear SOA design
• Allow mashups, BPEL and ESB integration
– Automated provisioning
– Support hybrid multi-tenancy models for legacy
software
@pzfreo #wso2 13

14. Multi-tenancy
• Every service can support multiple tenants in the same
container
– Higher efficiency, lower resources
– Can be split tenant per-VM using the MT-aware Load Balancer
• Isolation includes classloaders, code signing and Java
security policies
– Cross-tenant sharing is via the network (REST, SOAP, etc)
• Every tenant has all services by default but they can be
turned off
• You can deploy webapps that are available to all tenants
– Super Tenant mode
@pzfreo #wso2 14

15. Carbon Context
• org.wso2.carbon.context.CarbonContext
• Access to:
– UserRealm (Identity)
– Registry
– Cache (JSR107)
– Endpoint Discovery
• All within the correct environment for the
tenant or within a super-tenant environment
@pzfreo #wso2 15

16. Stratos 1.5.2 Services
© WSO2 2011 @pzfreo #wso2

17. What is a “Stratos Service”
• A cluster of one or more network-available servers
– could be VMs or JVMs or Linux partitions
– Each cluster can logically handle all tenants
• Maybe that there is partitioning by tenant or group of tenants
– Should support SAML2 single-sign on
• Identity is used to identify which tenant
• Can be elastically scaled
– Not a hard requirement
– Elasticity and Multi-tenancy are orthogonal
@pzfreo #wso2 17

18. List of Stratos Services
• cloud-services-desc.xml
<cloudServices xmlns="http://wso2.com/carbon/cloud/mgt/services">
<cloudService name="WSO2 Stratos Enterprise Service Bus" default="true">
<label>Stratos Enterprise Service Bus</label>
<link>https://esb.cloud-test.wso2.com:9452</link>
<icon>
https://cloud-test.wso2.com:9443/cloud-services-icons/esb.gif
</icon>
<productPageURL>http://wso2.com/products/enterprise-service-bus/</productPageURL>
<description>Enterprise Service Bus in the cloud.</description>
</cloudService>
…
• The Registry is used to manage which tenants have access
to which services:
– E.g. /_system/governance/repository/components/org.wso2.stratos/cloud-
manager/cloud-services/27/WSO2 Stratos Enterprise Service Bus
@pzfreo #wso2 18

19. Elastic Auto-Scaling
• The WSO2 Elastic Load Balancer is a key part
of the Stratos infrastructure
– Tenant Self-registration, self-deployment and
multi-tenancy could lead to a lot of work on a
single server
– The Stratos multi-tenancy approach is designed
to support the “long-tail”
@pzfreo #wso2 19

20. Elastic Load Balancer
@pzfreo #wso2 20

21. Stratos Elastic Load Balancer
• A custom deployment of Synapse tuned for passthru proxying and
performance
• Currently supports EC2 APIs
– Amazon, Eucalyptus, OpenStack with vmWare and Rackspace in plan
• There is a base AMI ID and a per-service payload zip
– ELB starts the AMI on a new VM by passing a payload.zip
– - Payload contains S3 credentials, information about Product to be
– deployed, configuration files locations, etc.
– AMI downloads the payload.zip
– AMI connects to S3 using credentials, downloads the service binary from S3
and config files using information from payload.zip
• Autoscaling is currently based on concurrent message load
– Extensible model
– Looking at using wider metering results
@pzfreo #wso2 21

22. Example of a new Service
• PHP Services (in progress)
– Using chroot environments
• Also looking at LXC (http://lxc.sourceforge.net/)
• A lightweight model for virtualization/tenant separation
• Each tenant runs on a different ip+port on the server
– http://php.stratos.your.com/t/fremantle.org/app
• is URL rewritten to
– http://ip:port/app
• The PHP environment uses the Identity Server and Registry
– Provide a store for code
– Tenant identity and authorization model
• This will be extended to become a full SPI (Service Provider
Interface) to plug in any new non-Java Service
@pzfreo #wso2 22

23. Adding multi-tenancy to existing apps
• Start with the PHP Service model
• Add in:
– HDFS support (multi-tenant filesystem)
– RSS support (multi-tenant JDBC/RDBMS)
– Multi-tenant Logging model
• Can be syslog-based logging calls
– Elastic scaling
– Metering and Billing calls
• Optional – but useful
• Multi-language Thrift API
@pzfreo #wso2 23

24. Integrating Development Management
into Stratos
• The Stratos Service model is very extensible
and flexible
– E.g. Dev / Staging / Production can be different
“Stratos Services”
– Use Registry lifecycles or BPEL to manage the
workflow / lifecycle of code into those Services
@pzfreo #wso2 24

25. Integrating Development Management
into Stratos
@pzfreo #wso2 25

26. Workflows
Examples
• Add project (aka tenant)
– Creates Project Management, SVN, and Stratos Tenant
• Add user to project
– Configures permissions in SVN, PM and Stratos
• Deploy project into production
– Initiates approval governance process
– Maven build of the code
– Deploys into staging
• Notifies approval team of new project awaiting approval
– Once approved, automatically deploys into Production
@pzfreo #wso2 26

27. Recap
• Understanding Stratos
• What are Stratos Services
– How do I extend, re-use, reconfigure, add my own
• What is the Stratos ELB?
– How does it work
– Roadmap
• How to add multi-tenancy to existing apps
• Managing development and governance
@pzfreo #wso2 27

28. Enterprise Application Development
API Store and API Management
@pzfreo #wso2

29. Users
Partners
“Your Business As A Service”
Tenant Tenant Tenant Tenant
Apps Apps Apps Apps
Ecosystem Owner
PaaS / Stratos
API Management / API Store
Existing business systems as APIs
@pzfreo #wso2

30. Vertical PaaS
“Your Business as a Service”
• Based on real projects that WSO2 is running
• Beyond APIs – because it creates a shared
governance model and runtime
• An opportunity to add significant value to
partners:
• A complete environment that they can customize
• Can include multi-tenanted legacy software
• Not just the look and feel but also the behaviour
• An ideal platform for shared revenue
• A shift in business models enabled by cloud
technology
@pzfreo #wso2

31. “Your Business”-as-a-Service summary
• Inherent deep multi-tenancy enables
ecosystem plays
• Not just shallow per-tenant customization
• E.g. eBay Stores, Amazon Sellers
• But significant per-tenant customization
• Client success stories demonstrates key
aspects:
• Ecosystem creation
• Shared governance and revenue model
• Significant benefit beyond APIs
• Cloud Development
• Automated Governance
@pzfreo #wso2

32. Questions?
http://www.flickr.com/photos/oberazzi/
@pzfreo #wso2 32