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Grid ComputingGlobus Toolkit 4 - GT4
Jean-Marc PiersonDecember 2007
pierson at irit.fr
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Grid Computing by thefathers of the Grid
Ian Foster: “Resource sharing & coordinatedproblem solving in dynamic, multi-institutionalvirtual organizations”. http://www-fp.mcs.anl.gov/~foster/
“HW and SW infrastructure that providesdependable, consistent, pervasive and inexpensiveaccess to high-end computational capabilities”
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Grid Definition RefinedUse Open ProtocolsIs decentralizedDeliver non-trivial QoS
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Service OrientedArchitecture
Open Grid Service ArchitectureWSRF : Web Service Resource FrameworkEverything is resources, WS-ResourcesAccess through services
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Basic useful services
VO Management Service: resources allocation toeach Virtual Organization.
Resource Discovery and Management Service Job Management Service And much more: security (authentication,
authorisation, data management)…
All all services interact: example Job ManagementService needs Resource Discovery
Need Standardization for interfaces to services Example: JobSubmissionService has a submitJob() method
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Base infrastructure toimplement the
architecture OGSA?The method invocation should also be
standardized.Corba? RMI? RPC?No : Web Services!!
But need Stateful Web Services!
WSRF: Web Services Resource Framework
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© Globus Tutorial
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Web Services in Grid?Pros:
XML, language and platform independenceHTTP usage for transmitting messages, no
security problems with firewall
Cons:XML, overhead by the verbosityLack of versatility, only basic invocation (no
other services provided, unless using higherlevel Web Services, role of WSRF)
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© Globus Tutorial10
GT4 and othersGT4 is an implementation of WSRF
specificationDeveloped by the Globus Alliance,
www.globus.org
WSRF.NET is another one for instancehttp://www.cs.virginia.edu/~gsw2c/wsrf.net.html
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© Globus Tutorial
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Web Services invocation
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The Web servicesWSDL/SOAP/HTTP
pancake
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More inside Webservices invocations
You don’t have to program the stubs/nor the SOAP requests/responsesJust like Corba and RMI
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Another view of thepancake
Normal services, written in Java for instance
SOAP engine: to marshall/serialize requests/response
Ex: in GT4, it is Axis
Application Server: for instance Jakarta/Tomcat
Apache for instance
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From stateless tostateful WS
Using the concept ofresources
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WS-Resources
Web Service + Resource = WS-Resources
To address these, we need a endpoint reference to specify the resource
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Specification, WSRF and more
WS-ResourceProperties: defined in the WSDLinterface
WS-ResourceLifetime: manage lifecycle of the WS-Resources
WS-ServiceGroup: group services or WS-Resources together allow to find in the group services meeting a particular
property allow also to address all services of the group by one
entry point
WS-BaseFaults: for fault reportingWS-Notification: producer/consumer modeWS-Addressing: to address the WS-Resources
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Writing a WSRFWeb/Grid Service
Five Steps, only !1. Define the service’s interface. This is done with
WSDL2. Implement the service. This is done with Java.3. Define the deployment parameters. This is done
with WSDD and JNDI4. Compile everything and generate a GAR file.
This is done with Ant5. Deploy service. This is also done with a GT4 tool
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A example serviceinterface
public interface Math{
public void add(int a);public void subtract(int a);public int getValueRP();
}
In Java or IDL, the description is simple…
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WSDLservice description
<?xml version="1.0" encoding="UTF-8"?><definitions name="MathService”
targetNamespace="http://www.globus.org/namespaces/examples/core/MathService_instance"
xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:tns="http://www.globus.org/namespaces/examples/core/MathService_instance" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:wsrp="http://docs.oasis-open.org/wsrf/2004/06/wsrf-WS-ResourceProperties-1.2-
draft-01.xsd" xmlns:wsrpw="http://docs.oasis-open.org/wsrf/2004/06/wsrf-WS-ResourceProperties-1.2-
draft-01.wsdl" xmlns:wsdlpp="http://www.globus.org/namespaces/2004/10/WSDLPreprocessor" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><wsdl:import namespace="http://docs.oasis-open.org/wsrf/2004/06/wsrf-WS-ResourceProperties-1.2-
draft-01.wsdl" location="../../wsrf/properties/WS-ResourceProperties.wsdl" />
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<!--==== P O R T T Y P E ==========--><portType name="MathPortType"wsdlpp:extends="wsrpw:GetResourceProperty"wsrp:ResourceProperties="tns:MathResourceProperties">
<operation name="add"><input message="tns:AddInputMessage"/><output message="tns:AddOutputMessage"/></operation>
<operation name="subtract"><input message="tns:SubtractInputMessage"/><output message="tns:SubtractOutputMessage"/></operation>
<operation name="getValueRP"><input message="tns:GetValueRPInputMessage"/><output message="tns:GetValueRPOutputMessage"/></operation></portType></definitions>
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<!--====== M E S S A G E S ======--><message name="AddInputMessage">
<part name="parameters" element="tns:add"/></message><message name="AddOutputMessage">
<part name="parameters" element="tns:addResponse"/></message>
<message name="SubtractInputMessage"><part name="parameters" element="tns:subtract"/></message>
<message name="SubtractOutputMessage"><part name="parameters" element="tns:subtractResponse"/></message>
<message name="GetValueRPInputMessage"><part name="parameters" element="tns:getValueRP"/>
</message><message name="GetValueRPOutputMessage"><part name="parameters" element="tns:getValueRPResponse"/>
</message>
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<! === T Y P E S ========--><types><xsd:schema
targetNamespace="http://www.globus.org/namespaces/examples/core/MathService_instance"xmlns:tns="http://www.globus.org/namespaces/examples/core/MathService_instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<!-- REQUESTS AND RESPONSES --><xsd:element name="add" type="xsd:int"/><xsd:element name="addResponse"><xsd:complexType/></xsd:element>
<xsd:element name="subtract" type="xsd:int"/><xsd:element name="subtractResponse"><xsd:complexType/></xsd:element>
<xsd:element name="getValueRP"><xsd:complexType/></xsd:element><xsd:element name="getValueRPResponse" type="xsd:int"/> 26
<!-- RESOURCE PROPERTIES -->
<xsd:element name="Value" type="xsd:int"/><xsd:element name="LastOp" type="xsd:string"/>
<xsd:element name="MathResourceProperties"><xsd:complexType><xsd:sequence>
<xsd:element ref="tns:Value" minOccurs="1" maxOccurs="1"/><xsd:element ref="tns:LastOp" minOccurs="1" maxOccurs="1"/></xsd:sequence>
</xsd:complexType></xsd:element>
</xsd:schema></types>
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Mapping between WSDLand Java Classes
http://www.globus.org/namespaces/examples/core/MathService_instance=org.globus.examples.stubs.MathService_instance
http://www.globus.org/namespaces/examples/core/MathService_instance/bindings=org.globus.examples.stubs.MathService_instance.bindings
http://www.globus.org/namespaces/examples/core/MathService_instance/service=org.globus.examples.stubs.MathService_instance.service
File: namespace2package.properties28
{http://www.globus.org/namespaces/examples/core/MathService_instance}Value
A utility class: Qnamepackage org.globus.examples.services.core.first.impl;import javax.xml.namespace.QName;public interface MathQNames {public static final String NS =“http://www.globus.org/namespaces/ examples/core/MathService_public”;static final QName RP_VALUE = new QName(NS, "Value");public static final QName RP_LASTOP = new QName(NS, "LastOp");public static final QName RESOURCE_PROPERTIES = new QName(NS,"MathResourceProperties");}
Notion of QName(Qualified Names)
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Our first Globus service:service and resource together
package org.globus.examples.services.core.first.impl;import java.rmi.RemoteException;
import org.globus.wsrf.Resource;import org.globus.wsrf.ResourceProperties;import org.globus.wsrf.ResourceProperty;
import org.globus.wsrf.ResourcePropertySet;import org.globus.wsrf.impl.ReflectionResourceProperty;import org.globus.wsrf.impl.SimpleResourcePropertySet;
import org.globus.examples.stubs.MathService_instance.AddResponse;import
org.globus.examples.stubs.MathService_instance.SubtractResponse;import org.globus.examples.stubs.MathService_instance.GetValueRP;
public class MathService implements Resource, ResourceProperties { …}
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Resources Properties/* Resource Property set */private ResourcePropertySet propSet;
/* Resource properties */private int value;private String lastOp;/* Get/Setters for the RPs */public int getValue() { return value; }public void setValue(int value) { this.value = value; }public String getLastOp() { return lastOp; }public void setLastOp(String lastOp) { this.lastOp =
lastOp; }
/* Required by interface ResourceProperties */public ResourcePropertySet getResourcePropertySet() {return this.propSet; }
Caution:Properties have same names than inWSDL, Beware of uppercase/lowercase
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Constructorpublic MathService() throws RemoteException {this.propSet = new SimpleResourcePropertySet(MathQNames.RESOURCE_PROPERTIES);
try {ResourceProperty valueRP = new ReflectionResourceProperty(MathQNames.RP_VALUE, "Value", this);this.propSet.add(valueRP);setValue(0);
ResourceProperty lastOpRP = new ReflectionResourceProperty(MathQNames.RP_LASTOP, "LastOp", this);this.propSet.add(lastOpRP);setLastOp("NONE");
} catch (Exception e) { throw newRuntimeException(e.getMessage());}
} 32
The service itself(finally ;))
public AddResponse add(int a) throwsRemoteException {
value += a;lastOp = "ADDITION";return new AddResponse();}
public int getValueRP(GetValueRP params)throws RemoteException {
return value;}
But in WSDL, we said different !
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Parameters handling:boxing
From:void multiply(int a1, int a2);
To:public MultiplyResponse multiply(Multiply params)
throws RemoteException{int a1 = params.getA1()int a2 = params.getA2()// Do somethingreturn new MultiplyResponse();}
Boxing return type if void or complex type
Boxing parameters if numberis not one, or not simple type
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Service done,are we ready/finished?
Configuring the deploymentWith WSDD and JNDI
Deploying into a container
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WSDD file<?xml version="1.0" encoding="UTF-8"?><deployment name="defaultServerConfig" xmlns="http://xml.apache.org/axis/wsdd/" xmlns:java="http://xml.apache.org/axis/wsdd/providers/java" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
This will translate to http://localhost:8080/wsrf/services/examples/core/first/MathService <service name="examples/core/first/MathService" provider="Handler" use="literal"
style="document"> <parameter name="className”
value="org.globus.examples.services.core.first.impl.MathService"/> Automatically generated from Math.wsdl written before.<wsdlFile>share/schema/examples/MathService_instance/Math_service.wsdl</wsdlFile> <parameter name="allowedMethods" value="*"/> <parameter name="handlerClass" value="org.globus.axis.providers.RPCProvider"/> <parameter name="scope" value="Application"/> <parameter name="providers" value="GetRPProvider"/> Resource Property provider <parameter name="loadOnStartup" value="true"/> </service>
</deployment> 36
JNDI file:linking Service to Resource(s)
<?xml version="1.0" encoding="UTF-8"?><jndiConfig xmlns="http://wsrf.globus.org/jndi/config">
<service name="examples/core/first/MathService"><resource name="home"
type="org.globus.wsrf.impl.ServiceResourceHome"><resourceParams><parameter><name>factory</name><value>org.globus.wsrf.jndi.BeanFactory</value></parameter></resourceParams></resource></service></jndiConfig>
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Generating a GAR file:Grid Archive
What to be done:1. (Pre-) Processing the WSDL file to add
missing pieces (such as bindings)2. Creating the stub classes from the WSDL3. Compiling the stubs classes4. Compiling the service implementation5. Organize all the files into a very specific
directory structure38
UsingAnt anda shell
script forthis!
./globus-build-service.sh -d <service base directory> -s <service’s WSDL file>
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Deployment in theGlobus container
Using the globus-deploy-gar command$ globus-deploy-gar name_of_gar.gar
undeployment: globus-undeploy-gar
Start container, verify if service is running$ globus-start-container -nosec // starting container without security checks // lot of service, normally ours…// on a line like this:http://127.0.0.1:8080/wsrf/services/examples/core/first/MathService
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A simple clientpackage org.globus.examples.clients.MathService_instance;import org.apache.axis.message.addressing.Address;import org.apache.axis.message.addressing.EndpointReferenceType;
import org.globus.examples.stubs.MathService_instance.MathPortType;import org.globus.examples.stubs.MathService_instance.GetValueRP;importorg.globus.examples.stubs.MathService_instance.service.MathServiceAddressingLocator;
public class Client {public static void main(String[] args) {MathServiceAddressingLocator locator = new MathServiceAddressingLocator();try { String serviceURI = args[0];
// Create endpoint reference to service+resourceEndpointReferenceType endpoint = new EndpointReferenceType();endpoint.setAddress(new Address(serviceURI));MathPortType math = locator.getMathPortTypePort(endpoint);math.add(10);math.subtract(5);System.out.println(“Value: "+ math.getValueRP(new GetValueRP()));
} catch (Exception e) {e.printStackTrace(); }}}
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CompilingInvoking the client: it works!!!
$ source $GLOBUS_LOCATION/etc/globus-devel-env.sh$ javac -classpath
./build/stubs/classes/:$CLASSPATHorg/globus/examples/clients/MathService_instance/Client.java
// client compiled
$ java -classpath ./build/stubs/classes/:$CLASSPATHorg.globus.examples.clients.MathService_instance.Clienthttp://127.0.0.1:8080/wsrf/services/examples/core/first/MathService
Value: 5// if we call again, we will have: Value:10, then
Value: 15, … The grid service is stateful!42
From aservice+resource embedded
to …service/resource home/resource
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Link with thefirst part case
Remember : in JNDI file, we had <resource name="home" type="org.globus.wsrf.impl.ServiceResourceHome">
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Changes to do…WSDL file: no change, only the
implementation will change !!Utility class Qname: no change, except the
package name ;)Resource class: same as previous service
one, except removing the operations(add/substract/…), and the ResourceProperty initialization is changed fromConstructor to a method initialize()
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Service changes:Resource Properties are
no longer therepublic AddResponse add(int a) throws RemoteException{MathResource mathResource = getResource();mathResource.setValue(mathResource.getValue() + a);mathResource.setLastOp("ADDITION");return new AddResponse();}private MathResource getResource() throws RemoteException {Object resource = null;try { resource =
ResourceContext.getResourceContext().getResource();} catch (Exception e) { throw new RemoteException("", e); }MathResource mathResource = (MathResource) resource;return mathResource;} 46
Resource Home
package org.globus.examples.services.core.singleton.impl;import org.globus.wsrf.Resource;import org.globus.wsrf.impl.SingletonResourceHome;public class MathResourceHome extends SingletonResourceHome
{public Resource findSingleton() {try {// Create a resource and initialize it.MathResource mathResource = new MathResource();mathResource.initialize();return mathResource;} catch (Exception e) {e.printStackTrace();return null;}}}
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Deployment and test
No change in WSDD, except the names of serviceand class ;)
In JNDI, change to indicate the new service nameand its associated Resource Home:
<servicename="examples/core/singleton/MathService">
<resource name="home"type="org.globus.examples.services.core.singleton.impl.MathResourceHome">
Creating GAR file, deploying GAR file, testing withthe same client !
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FromSingle resource to
Multiple resources:Factories come into the play
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Factory in GT4
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New needs
Factory is a service that must be developed anddeployed, just as the normal one: write WSDL, Javaimplementation
Service: no change (quick look back) Resource: must implement a ResourceIdentifier
interface (getId() method), meaning giving anidentifier (any type here) to the resource
Resource Home: only change to extendResourceHomeImpl able to handle multipleresources
WSDD and JNDI file must be changed to integratenew Factory service, and the link between Factoryand Service: in JNDI, we have now:
<resource name="home"type="org.globus.examples.services.core.factory.impl.MathResourceHome">
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A client using Factories// nota: package and import are missing…public class Client {public static void main(String[] args) {FactoryServiceAddressingLocator factoryLocator = newFactoryServiceAddressingLocator();MathServiceAddressingLocator instanceLocator = newMathServiceAddressingLocator();try { String factoryURI = args[0];
EndpointReferenceType factoryEPR, instanceEPR;FactoryPortType mathFactory;MathPortType math;
factoryEPR = new EndpointReferenceType();factoryEPR.setAddress(new Address(factoryURI));mathFactory = factoryLocator.getFactoryPortTypePort(factoryEPR);
CreateResourceResponse createResponse =mathFactory.createResource(new CreateResource());
instanceEPR = createResponse.getEndpointReference();// this instanceEPR can be written to a file for other clients to use it
math = instanceLocator.getMathPortTypePort(instanceEPR);math.add(10); math.subtract(5);… 52
More about Resource Properties:WS-ResourceProperties interface
GetResourceProperty: to retrieve a propertyvalue (same role as the get accessor)
GetMultipleResourcePropertiesSetResourceProperties: possibility to update,
insert or delete a RPQueryResourceProperties: with a Xpath
syntax, since RP are in XML document
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From WSDL def to RP document<!-- RESOURCE PROPERTIES --><xsd:element name="Value" type="xsd:int"/><xsd:element name="LastOp" type="xsd:string"/><xsd:element name="MathResourceProperties"><xsd:complexType><xsd:sequence><xsd:element ref="tns:Value" minOccurs="1" maxOccurs="unbounded"/><xsd:element ref="tns:LastOp" minOccurs="1" maxOccurs="unbounded"/></xsd:sequence></xsd:complexType></xsd:element>Corresponding RP document after some calls to the service: <MathResourceProperties
xmlns:tns="http://www.globus.org/namespaces/examples/core/MathService_instance”><tns:Value>10</tns:Value><tns:Value>30</tns:Value><tns:Value>50</tns:Value><tns:Value>40</tns:Value><tns:LastOp>ADDITION</tns:LastOp><tns:LastOp>ADDITION</tns:LastOp><tns:LastOp>ADDITION</tns:LastOp><tns:LastOp>SUBTRACTION</tns:LastOp></MathResourceProperties>
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Revisit the first examplewith WS-ResourceProperties
Change in the WSDL file, adding:<portType name="MathPortType"wsdlpp:extends="wsrpw:GetResourcePropertywsrpw:GetMultipleResourcePropertieswsrpw:SetResourcePropertieswsrpw:QueryResourceProperties"wsrp:ResourceProperties="tns:MathResourceProperties">
Change in the WSDD file, changing the providers line to<parameter name="providers" value="GetRPProvider GetMRPProvider
SetRPProvider QueryRPProvider"/>
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Accessing theResourceProperty
private void printResourceProperties(MathPortType math)throws Exception {
GetResourcePropertyResponse valueRP, lastOpRP;String value, lastOp;
valueRP = math.getResourceProperty(MathQNames.RP_VALUE);lastOpRP = math.getResourceProperty(MathQNames.RP_LASTOP);
value = valueRP.get_any()[0].getValue();lastOp = lastOpRP.get_any()[0].getValue();System.out.println("Value RP: " + value);System.out.println("LastOp RP: " + lastOp);
Since what is returned is a XML document, with potentially different values, we have to access the right one
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Some basics of GlobusGlobus Toolkit
Some already existing services, deployed in a“container” : globus-start-container
Some libraries/tools to falicitate thedevelopment of new services and theirdeployment : globus-deploy-gar
Some command line tools for managing the jobson the grid : grid-proxy-init, globusrun-ws, …
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Using gridFTP in GT4
globus-url-copy : copying from one site toanother, but gridFTP needs to run on bothmachine.
$ globus-url-copy -vbgsiftp://raisin.irit.fr/etc/issuefile:/tmp/foo
���Source: gsiftp://nodeb.ps.univa.com/etc/ ���Dest: file:/tmp/ ���issue -> foo
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GRAM 4
GridFTPRFT
Delegation
GridFTP
GRAMservices
local sched.
user job
compute element
compute element and service host(s)
remote storage element(s)
FTP data
FTP control
clie
nt
job submit
delegate
xfer
requ
est
local job control
delegateGRAMadaptersu
do
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Simple Job SubmissionSubmit job to a GRAM service
default factory EPRgenerate job RSL to default localhost
Command example:% globusrun-ws -submit -c /bin/touchtouched_itSubmitting job...Done.Job ID: uuid:002a6ab8-6036-11d9-bae6-0002a5ad41e5Termination time: 01/07/2005 22:55 GMTCurrent job state: ActiveCurrent job state: CleanUpCurrent job state: DoneDestroying job...Done.
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Complete Factory Contact
•Override default EPRSelect a different host/service : here theservice is located on machine raisin.irit.fr, onport 8443Relies on proprietary knowledge of EPR format!
•Command example:% globusrun-ws -submit –Fhttps://raisin.irit.fr:8443/wsrf/services/ManagedJobFactoryService -c /bin/touch touched_it
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Read RSL from File
Command:% globusrun-ws -submit -f touch.xml
Contents of touch.xml file:<job><executable>/bin/touch</executable> <argument>touched_it</argument></job>
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Batch Job Submissions
% globusrun-ws -submit -batch -o job_epr -c/bin/sleep 50Submitting job...Done.Job ID: uuid:f9544174-60c5-11d9-97e3-0002a5ad41e5Termination time: 01/08/2005 16:05 GMT
% globusrun-ws -monitor -j job_eprjob state: ActiveCurrent job state: CleanUpCurrent job state: DoneRequesting original job description...Done.Destroying job...Done.
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Jobs using files, using gridFTP<job>
<executable>/bin/echo</executable><directory>/tmp</directory><argument>Hello</argument><stdout>job.out</stdout><stderr>job.err</stderr><fileStageOut> <transfer> <sourceUrl>file:///tmp/job.out</sourceUrl> <destinationUrl> gsiftp://host.domain:2811/tmp/stage.out </destinationUrl> </transfer></fileStageOut>
</job>
globusrun-ws -S -submit -F https://192.168.159.94:8443/wsrf/services/ManagedJobFactoryService -f job.xml
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RFT Options<fileStageOut>
<transfer> <sourceUrl>file:///tmp/job.out</sourceUrl> <destinationUrl> gsiftp://host.domain:2811/tmp/stage.out </destinationUrl>
<rftOptions> <subjectName>
/DC=org/DC=doegrids/OU=People/CN=Stuart Martin 564728
</subjectName>
<parallelStreams>4</parallelStreams> </rftOptions>
</transfer>
</fileStageOut>
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RSL Variable Example
<job><executable>/bin/echo</executable><argument>HOME is ${GLOBUS_USER_HOME}</argument><argument>SCRATCH =${GLOBUS_SCRATCH_DIR}</argument><argument>GL is ${GLOBUS_LOCATION}</argument><stdout>${GLOBUS_USER_HOME}/echo.stdout</stdout><stderr>${GLOBUS_USER_HOME}/echo.stderr</stderr>
</job>
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WSDL interfacesManagedJobFactory portType
createManagedJob operation Input:
Initial Termination Time Job ID
UUID of the job resource, for job reliability/recoverability
Subscribe Request Client can include a request to subscribe for job state notifications with
the job submission to avoid an extra operation call
Job Description / RSL Either a single or multi-job description
Output: newTerminationTime - new termination time of the job
resource managedJobEndpoint - EPR of the newly created job resource subscriptionEndpoint - EPR of the notification subscription
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ManagedJob portType
release operation Release a holdState set in the job description
Only one hold state can be set/released
Input: None Output: None
State change notifications State - job state (Active, Pending, Done, Cleanup…) Fault - fault causing a Failed state (if applicable) Exit Code - exit code of the job process Holding - boolean indicating if the job is in a hold state
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ManagedExecutableJobServiceExecutes the requested job process(es)
specified in the RSLResource Properties
(ManagedExecutableJobPortType) serviceLevelAgreement - the RSL / Job Description state - the current job state faults - the fault causing a Failed state localUserId - the username of the resource owner userSubject - the GSI subject of the resource owner holding - boolean indiciating the job is holding stdoutURL - the GridFTP URL to the stdout file stderrURL - the GridFTP URL to the stderr file credentialPath - the local path to the user proxy file exitCode - the exit code of the job proces (if applicable)
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ManagedMultiJobService Processes a multi-job RSL
submits the sub-jobs to the specifiedManagedJobFactoryService.
Sub-jobs cannot be multi-jobs themselves.
Resource Properties (ManagedMultiJobPortType) serviceLevelAgreement - the multi-job RSL / Job Description state - the current overall state faults - the fault causing a Failed state localUserId - the username of the resource owner userSubject - the GSI subject of the resource owner holding - boolean indiciating all jobs are holding subJobEndpoint - list of endpoints to the sub-jobs
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BibliographyThe Grid 2: Blueprint for a New Computing
Architecture. Ian Foster, Carl Kesselman
The Globus Toolkit 4 Programmer’sTutorial, Borja Sotomayor
www.globus.org
