Information Technology Reference
In-Depth Information
12.4 Operating the Gateway
After the development and testing phases were completed, SSS-Gateway was
deployed in the production environment. Since no local resources are utilized by the
SSF workflows, no additional loads are introduced by them. On the other hand,
some of the portlets use local resources to process outputs generated by the SSF
workflows, but they are not demanding in terms of computational resources.
Therefore, both front-end and back-end services of WS-PGRADE/gUSE are hosted
on the same production server, which is a virtual machine running Scienti
c Linux.
The deployment of the gateway was easily achieved with the help of the gUSE
Installation Wizard. In order to bene
t from the latest gUSE facilities, SSS-Gateway
is kept up-to-date by upgrading with each major release of gUSE. Upgrade manuals
provide the necessary steps to upgrade gUSE smoothly.
SSS-Gateway is con
gured to connect to a number of DCIs listed below:
The gLite-based SEEGRID virtual organization (VO) in the European Grid
Infrastructure (EMI)
gLite-based VOs operated as part of the Turkish Science e-Infrastructure
The OpenNebula-based academic cloud of SZTAKI
The PBS cluster called
“
Pomegranate
”
at Middle East Technical University.
It should be noted that when a group of new users with their own DCI joins the
gateway, it is very straightforward to add that new DCI to the list of accessible DCIs.
For the VO-based DCIs, EMI user interface installation was completed
beforehand on the server hosting the gateway. Afterwards, the gLite DCI Bridge
plugin provided by gUSE was con
gured to enable access to VO-based DCIs.
Since the Pomegranate cluster is managed by Torque/Maui, the PBS plugin of
DCI Bridge is used for local cluster access. For this plugin to successfully submit
workflows to the local cluster, some preliminary set-up actions were performed. In
particular, public key authentication was set up between the server and cluster, and
a job queue was configured to run workflows submitted by the gateway users.
New users can create accounts for SSS-Gateway by themselves using the
“
functionality of Liferay. Since the gateway employs role-based
authorization, new users should then send an e-mail to the gateway administrator
for selecting any of the three roles provided for each of the simple, advanced, and
expert service levels. Upon receiving such an e-mail, the administrator assigns the
requested role to the user. Up to the time of writing this topic, all the users preferred
the role for the simple service level during registration. Then, about 10 % of them
progressed further to the advanced or expert service level after they got used to
SSS-Gateway.
In addition to the e-mail contact, SSS-Gateway provides various facilities for
user support. First, the documentation contains the complete user manual and also a
quick guide with sample input
Create Account
”
files describing step-by-step use-cases. Next, the
demo videos show typical usages of the portlets. Finally, the discussion forum, also
provided by gUSE framework, offers a simple interface for users to ask questions
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