WS-PGRADE/gUSE and Clouds - Science Gateways for Distributed Computing Infrastructures - page 99

Fig. 7.3 CloudBroker authentication portlet

For every CBP service connected to the gateway there is a separate plug-in
instance in the DCI Bridge. Portal users have to provide their credentials for every
CBP service in order to be able to con

gure and run jobs on the given service: the
username and the password. Figure 7.3 shows a view of the CloudBroker
authentication portlet. As it can be seen in Fig. 7.3 , three CBP services are con-

gured: “ platform ” , “ scibus ” and “ Dumm ” . Once the user has entered or modi ed

the credentials to be used for a given CBP service, the ”

button can be used to save the new credentials. The portlet also checks if the
provided credentials are valid (performs authentication with the selected CBP
service), and noti

“ Save authentication data

es the user if any problems were detected.

7.4.1.2 Concrete Workflow Configuration

Once the user has set proper CBP credentials, workflow nodes can be con gured to

run on an available CBP service. Users have two possibilities: either they can select
from the prede ned set of applications provided by the CBP service, or they can

upload their own application given that the wrapper-enabled CBP application has
been con s admin interface (details can be found in

Sect. 2.15 of the DCI Bridge Admin manual).
Figure 7.4 shows the con

gured in the DCI Bridge '

guration of a workflow node where a prede ned

executable ( figure) is selected from the list of applications

registered on the corresponding CBP service. As shown in the

“ Autodock 4.2.3 ” in the

figure, the portlet can
display an estimated cost for the execution of the job given that using the selected
application and resource is not free of charge. The estimated cost is presented for
the job as if it would execute only once, and would run for 1 h.
Figure 7.4 also shows a node con

guration where the user is making use of the
wrapping method. As it can be seen, the property indicates that the user

is about to use her own executable, the previously uploaded executable is high-
lighted (if applicable), and the user has the possibility to upload the executable she
wants to run with the help of the Browse button.

“ Software ”