WS-PGRADE/gUSE and Clouds - Science Gateways for Distributed Computing Infrastructures - page 96

of its input fixed name. If a client invoking the CBP wants to use the

IaaS-like execution to run its own executable, then the client simply has to select
the wrapper application, and provide the desired executable as an additional input

files with a

file called as “ execute.bin ” .

7.3 Integrated WS-PGRADE/CloudBroker Platform
to Access Multiclouds

The integration of WS-PGRADE/gUSE and the CloudBroker Platform is based on
the idea of using the CBP as the entry point to cloud infrastructures. Thus, CBP is used
as a hub to access the different cloud resources and the applications deployed on them.
It follows from this that the integrated solution is capable of handling every cloud
infrastructure accessible by the CBP. Such infrastructures include OpenNebula-
based, OpenStack-based, Eucalyptus, Amazon, and IBM clouds. Notice that
CloudBroker Platform plays the same role for clouds as DCI Bridge for all the DCIs.
Additionally, the integrated solution offers two modes of operation: SaaS-like
and IaaS-like. The SaaS-like operation mode enables the gateway users to run
applications deployed on the CBP, whereas in case of the IaaS-like operation the
users are able to run their own applications, with the help of a hidden wrapper

Table 7.1 Comparison of IaaS and SaaS models
IaaS model SaaS model

Enables users to run their own
executable

Yes No

What has to be predeployed
in the virtual machine image

A single wrapper application Every application that

users would like to use

What has to be configured in
the CloudBroker Platform

Only the wrapper application Every application that

users would like to use

Level of security Low: user can run anything High: users can run only

preregistered, tested apps

Ease of use (user ' s
perspective)

Easy: very similar to existing
WS-PGRADE/gUSE
interface

Easy: user simply selects
from the prede ned
software

Ease of use (portal adminis-
trator

Easy: only two additional
properties have to be set

Very easy: no need to set
additional properties ' s perspective)

Ease of use (CloudBroker
administrator

Easy: only one application
has to be configured for each
cloud resource

Hard: every application
should be configured ' s perspective)

Easy of use (cloud
administrator ' s perspective)

Easy: only one VM image
has to be deployed

Hard: either a number of
VM images have to be
deployed or one VM
image must be updated a
number of times