Linux企业集群计算机类外文翻译@中英文翻译@外文文献翻译

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1、摘自：《Linux企业集群》(TheLinuxEnterpriseCluster)英文原文:TheLinuxEnterpriseClusterOverviewThischapterwillintroducetheclusterload-balancingsoftwarecalledIPVirtualServer(IPVS).TheIPVSsoftwareisacollectionofkernelpatchesthatweremergedintothestockversionoftheLinuxkernelstartingwithversion2.4.23.Whencombinedw

2、iththekernel'sroutingandpacket-filteringcapabilities(discussedinChapter2)theIPVS-enabledkernelletsyouturnanycomputerrunningLinuxintoaclusterloadbalancer.Together,theIPVS-enabledclusterloadbalancerandtheclusternodesarecalledaLinuxVirtualServer(LVS).TheLVSclusterloadbalanceracceptsallincomingcli

3、entcomputerrequestsforservicesanddecideswhichclusternodeshouldreplytoeachrequest.TheloadbalancerissometimescalledanLVSDirectororsimplyaDirector.InthisbookthetermsLVSDirector,Director,andloadbalancerallrefertothesamething.ThenodesinsideanLVSclusterarecalledrealservers,andthecomputersthatconnect

4、totheclustertorequestitsservicesarecalledclientcomputers.Theclientcomputers,theDirector,andtherealserverscommunicatewitheachotherusingIPaddressesthesamewaycomputershavealwaysexchangedpacketsoveranetwork;however,tomakeiteasiertodiscussthisnetworkcommunication,theLVScommunityhasdevelopedanamingc

5、onventiontodescribeeachtypeofIPaddressbasedonitsroleinthenetworkconversation.SobeforeweconsiderthedifferenttypesofLVSclustersandthechoicesyouhavefordistributingyourworkloadacrosstheclusternodes(calledschedulingmethods),let'slookatthisnamingconventionandseehowithelpsdescribetheLVScluster.LVSIPA

6、ddressNameConventionsInanLVScluster,wecannotrefertonetworkaddressesassimply"IPaddresses."Instead,wemustdistinguishbetweendifferenttypesofIPaddressesbasedontherolesofthenodesinsidethecluster.HerearefourbasictypesofIPaddressesusedinacluster:VirtualIP(VIP)addressTheIPaddresstheDirectorusestooffer

7、servicestoclientcomputersRealIP(RIP)addressTheIPaddressusedontheclusternodesDirector'sIP(DIP)addressTheIPaddresstheDirectorusestoconnecttotheD/RIPnetworkClientcomputer'sIP(CIP)addressTheIPaddressassignedtoaclientcomputerthatitusesasasou