1. Apache Stratos
Hangout II
Dive into Cloud Controller..
Nirmal Fernando
Apache Committer and PPMC member of Apache Stratos Incubator.
Senior Software Engineer, WSO2 Inc.

2. Outline
● What is Cloud Controller (CC)?
● How does the architecture look like?
● What is a Service Topology?
● How does the service topology get built?
● What is the Service Interface of Cloud
Controller?
● What IaaS providers CC supports by
default?
● How easy it is to provide support for a new
IaaS provider?

3. What is Cloud Controller (CC)?
Cloud Controller plays a vital role in Apache Stratos and
here is a list of its capabilities and duties.
Cloud Controller,
● is acting as a bridge between application level and
Infrastructure as a Service (IaaS) level via jclouds API.
● enables your system to scale across multiple IaaS
providers.
● is the central location where the service topology
resides.

4. Cloud Controller,
● is responsible for sharing the up-to-date service
topology among other Stratos core services, instantly
and periodically.
● supports hot update and deployment of its configuration
files.
● has inbuilt support for AWS EC2 IaaS provider,
Openstack Nova IaaS provider, vCloud IaaS provider.
● enables you to cloud burst your system into multiple
IaaS providers.
● allows you to plug an implementation of any IaaS
provider supports by jclouds, very easily.

5. Cloud Controller,
● enables you to spawn new service instances, while
associating a public IP automatically, in order to reduce
the instance boot-up time.
● enables you to terminate an already started instance of
a particular service cluster.
● can be configured to tackle many scenarios, using its
well-thought-out configuration files.

6. How does the architecture look like?

7. What is a Service Topology?
Service topology is the information about the
different service clusters of your Cloud
environment.

8. Service Topology ...
services {
php {
domains {
my1.php.domain {
hosts my1.php.com;
tenant_range *;
min_app_instances 1;
max_app_instances 1;
}
my2.php.domain {
hosts my2.php.com;
tenant_range *;
min_app_instances 1;
max_app_instances 1;
}
}
}
mysql {
domains {
my1.mysql.domain {
hosts my1.mysql.com
tenant_range *;
min_app_instances 1;
max_app_instances 3;
max_requests_per_second 10;
}
}
}
}

9. How does the service topology get
built?

10. What is the Service Interface of
Cloud Controller?
Let’s have a look at this
interface.

11. What IaaS providers CC supports by
default?
● Theoretically we support any IaaS provider
that is supported by jclouds.
● Currently, we support,
○ AWS EC2
○ Openstack
○ vCloud
IaaSes.

12. How easy it is to provide support for
a new IaaS provider?
You are few steps away, look closely!
1. Your IaaS provider implementation (say org.
apache.stratos.cloud.controller.iaas.
ABCIaas.java) should extend the Iaas abstract
class (org.apache.stratos.cloud.controller.
interfaces.Iaas) provided by Cloud Controller.
Let’s have a look at this Iaas class.

13. How easy it is to provide support for
a new IaaS provider?
2. You should wrap the implementation in an
OSGi bundle and it should be a fragment
bundle of Cloud Controller. You can do this via
your bundle's pom file.
Add following line as a configuration instruction
of maven bundle plugin:
<Fragment-Host>org.apache.stratos.
cloud.controller</Fragment-Host>

14. How easy it is to provide support for
a new IaaS provider?
3. Also, it is pretty obvious that you need to add
'cloud-controller' component as a dependency
in your bundle’s pom file.
4. Next, you can drop the built bundle into
'${ApacheStratos-CC}
/repository/components/dropins/' folder.

15. How easy it is to provide support for
a new IaaS provider?
5. Finally, in Cloud Controller's cloud-
controller.xml, you need to define the
IaasProvider you are going to add and fully
qualified name of the implementation class.
eg:
<iaasProvider type="vcloud" name="vcloud specific
details"> <className>org.apache.stratos.cloud.
controller.iaas.ABCIaas.java</className>
….........
</iaasProvider>

16. ?

17. Next week ....
● What are the configuration files used by
Cloud Controller and where are they reside?
● Explain each configuration file in detail.
● Does Cloud Controller supports hot update
and hot deployment of its configuration files?

18. For more information …..
http://stratos.incubator.apache.org/
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