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1、IEEEINTERNETCOMPUTING,SPECIALISSUEONCLOUDCOMPUTING1AnOpenSourceSolutionforVirtualInfrastructureManagementinPrivateandHybridCloudsBorjaSotomayor,RubenS.Montero,IgnacioM.Llorente,andIanFoster´AbstractMoreoftenthannot,a“cloud”referstoan“Infrastructure-as-a-Service”(IaaS)cloud,suchasAmazonEC2,whereIT
2、infrastructureisdeployedinacloudprovider’sdatacenterintheformofvirtualmachines.WiththegrowingpopularityofIaaSclouds,anecosystemoftoolsandtechnologiesisemergingthatcantransformanorganization’sexistinginfrastructureintoaprivatecloudorahybridcloud.Inthisarticle,wepresentOpenNebula,anopensourcevirtua
3、linfrastructuremanagerthatcanbeusedtodeployvirtualizedservicesonbothalocalpoolofresourcesandonexternalIaaSclouds,andHaizea,aresourceleasemanagerthatcanactasaschedulingbackendforOpenNebulaprovidingfeaturesnotfoundinothercloudsoftwareorvirtualization-baseddatacentermanagementsoftware,suchasadvancer
4、eservationsandresourcepreemption,whichwearguetobespeciallyrelevantforprivateandhybridclouds.IndexTermsC.0.aEmergingtechnologies,D.4.7.bDistributedsystemsCloudComputingis,touseyetanothercloud-inspiredpun,anebulouslydefinedterm.However,itwasarguablyfirstpopularizedin2006byAmazon’sElasticComputeCloud(
5、orEC2,seehttp://www.amazon.com/ec2/),whichstartedofferingvirtualmachines(VMs)for$0.10/hourusingbothasimplewebinterfaceandaprogrammer-friendlyAPI.Althoughnotthefirsttoproposeautilitycomputingmodel,AmazonEC2contributedtopopularizingthe“InfrastructureasaService”(IaaS)paradigm,whichbecamecloselytiedto
6、thenotionofCloudComputing.AnIaaScloudenableson-demandprovisioningofcomputationalresources,intheformofVMsdeployedinacloudprovider’sdatacenter(suchasAmazon’s),minimizingoreveneliminatingassociatedcapitalcostsforcloudconsumers,allowingcapacitytobeaddedorremovedfromtheirITinfrastructureinordertomeetp
7、eakorfluctuatingservicedemands,whileonlypayingfortheactualcapacityused.Overtime,anecosystemofproviders,users,andtechnologieshascoalescedaroundthisIaaScloudmodel.MoreIaaScloudproviders,suchasGoGrid,FlexiScale,andElasticH
