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Grid Index Information Service - GIIS
Introduction
The Globus GIIS is hierarchical directory service (based upon the
Lightweight Directory Access Protocol servers) used to
build virtual oranisations through a network of
servers. Information relating to a resource is generated by a local
Globus Resource Index Service (GRIS). The GRIS feeds information to a
GIIS representing a virtual organisation. Resources within this GIIS
are propagated to other virtual organisations through other GIIS
servers. Together, the GRIS and GIIS servers form the Metacomputing
Directory Service (MDS) used to construct virtual organisations
within the Globus toolkit.
LeSC hosts a GIIS for its own resources, those of Imperial College London and
the wider London area. These resources will be federated into the emerging UK
e-Science Grid. The servers and names of these virtual organisations
are given below:
| hostname | Virtual Organisation |
| giis.lesc.ic.ac.uk | mds-vo-name=LeSC,o=grid |
| giis-ic.lesc.ic.ac.uk | mds-vo-name=Imperial College,o=grid |
| giis-london.lesc.ic.ac.uk | mds-vo-name=London,o=grid |
Joining the Virtual Organisation
To add your resources into these virtual organisations you will have
to alter the etc/grid-info-resource-register.conf file in
your Globus installation tree.
Add an entry such as the following, which places information in LeSC's
local GIIS into the Imperial College GIIS.
dn: Mds-Vo-Op-name=register, Mds-Vo-name=Imperial College, o=grid +
regtype: mdsreg2
reghn: giis-ic.lesc.ic.ac.uk +
regport: 2135
regperiod: 60
type: ldap
hn: giis.lesc.doc.ic.ac.uk *
port: 2135 *
rootdn: Mds-Vo-name=LeSC, o=grid *
ttl: 120
timeout: 20
mode: cachedump
cachettl: 30
The entries marked with a * should be altered to reflect your
local GIIS server. The entries marked + should be altered if
you are wishing to federate your resources to one of LeSC's different
virtual organisations. Further information and assistance can be
obtained from lesc-help@imperial.ac.uk.
Querying the GIIS
To query information within a GIIS use the grid-info-search
command which is part of the Globus installation. The following
command displays the contents of the London e-Science Centre GIIS.
grid-info-search -x -h giis.lesc.ic.ac.uk -b "mds-vo-name=LeSC,o=grid"
-s sub "(objectclass=*)"
The search can be restricted by specifying a specific objectclass
or additional attributes. For further information see the Globus documentation.
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