1. Committer and PMC member of Apache Stratos
Senior Software Engineer, WSO2
Lahiru Sandaruwan
Developing and deploying SaaS app using
VMware vCloud Suite with Apache Stratos
Committer and PMC member of Apache Stratos
Software Engineer, WSO2
Melan Jayasingha

2. *
Agenda
• Developing and Development of SaaS
application
• Values added from cloud
• How to use vCloud as Stratos IaaS for
building a SaaS platform
• Demonstration with Joomla cartridge
• Scalability demo
• High Availability demo
• Q&A, Discussion

3. *
Development and Deployment
of SaaS application

4. *
Values added from cloud
๏ Scalability
๏ High Availability
๏ Load Balancing
๏ SLA Awareness

5. *
Scalability
"The ability of the of a system to
continue to operate correctly even
when it is scaled to a larger size”

6. *
Vertical Scaling
• Get the maximum out of each allocated JVM or
resource
• Increase CPU size
• Increase memory

7. *
Horizontal Scaling

8. *
Availability

9. *
Availability

10. *
High Availability
A system that is designed for continuous operation
in the event of a failure of one or more
components. However, the system may display
some degradation of service, but will continue to
perform correctly.
High Availability: The proportion of time during
which the service is accessible with reasonable
response times should be close to 100%.

11. *
How to decide required scale
(capacity) & availability?
• Average throughput (TPS)
• Max throughput (TPS)
• Monetary value of a transaction
• Average loss & max loss per second of
downtime
• Decide on how much to invest based on cost vs.
benefit tradeoff

12. *
Load Balancing
• Load balancing algorithms
• Round robin
• Weighted
• Response based
• Health check
• Failover-only

13. *
Configuring Stratos to use
vCloud
<iaasProvider type="vcloud" name="VMware vCloud specific details">
<className>org.apache.stratos.cloud.controller.iaases.VCloudIaas</className>
<provider>vcloud</provider>
<identity svns:secretAlias="cloud.controller.vcloud.identity"
>sampleusername</identity>
<credential svns:secretAlias="cloud.controller.vcloud.credential">*****</credential>
<property name="jclouds.endpoint" value="https://mycloud.stratogen.sg/api" />
<property name="jclouds.vcloud.version.schema" value="1.5" />
<property name="jclouds.api-version" value="1.5" />
<property name="autoAssignIp" value="true" />
iaasProvider>

14. *
Demo

15. *
References
๏ http://www.cari-info.org/cari-2012/session%201/1B3.pdf
๏ http://www.slideshare.net/afkham_azeez/java-colombo-developing-
highly-scalable-apps
- Azeez’s talk at Java Colombo

16. *
DISCUSSION

17. *
Thanks!