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https://<SASeriesAppliance
Controller-Hostname>/dana-na/healthcheck/healthcheck.cgi
Fromanexternalloadbalancer—Configureahealthcheckpolicythatsendsthe
followingrequesttoclusternodes:
GET/dana-na/healthcheck/healthcheck.cgiHTTP/1.1\r\nHost:localhost\r\n\r\n
Thenodereturnsoneoftwovalues:
“Securitygatewayisaccessible”string—Thisvaluemeansthenodeisactive.
500—ThisvaluedenotesanerrorandclusterSASeriesAppliancesstopforwarding
userrequeststothenode.
[xreftargethasnotitle]illustratesanactive/activeSASeriesAppliancecluster
configurationinwhichtheSASeriesApplianceshaveenabledexternalports.
Thisactive/activeclusterconfigurationisdeployedbehindanexternalloadbalancer.
Youcandeployaclusterpairormulti-unitclusterinactive/activemode.SASeriesuser
requestsaredirectedtotheclusterVIPdefinedontheloadbalancer,whichroutesthem
totheappropriatemachine.
Figure24:Active/ActiveConfiguration
Related
Documentation
SpecifyingActive/Passive,Active/Active,andOtherClusterSettingsonpage858
SynchronizingtheClusterStateonpage855
UsingDeviceCertificatesonpage727
SynchronizingtheClusterState
SASeriesstatesynchronizationoccursonlybymeansoftheinternalnetworkinterface
cards(NICs),andeachclustermemberisrequiredtopossesstheclusterpasswordto
communicatewithothermembers.Clustermemberssynchronizedatawhenthereisa
statechangeonanymember.SASeriesApplianceclusterstatedataiseither
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persistent—permanentlystoredontheSASeriesAppliance—ortransient—storedonthe
SASeriesApplianceonlyfortheuser’ssession.SASeriesstatedataisdividedintothe
followingmajorcategories:
Systemstate—Thisstateispersistentanddoesnotchangeoften.
Networksettings
Authenticationserverconfigurations
Authorizationgroupconfigurations,suchasaccesscontrollist,bookmark,messaging,
andapplicationdata
Userprofile—Thisdatacanbeeitherpersistentortransient,dependingonwhetheror
notyouhaveenabledpersistentcookiesandpersistentpasswordcaching.Ifyouhave
notenabledthesefeatures,thenthedataistransientandfallsintothenextcategory.
Userbookmarks—persistent
Persistentusercookies—ifthepersistentcookiesfeatureisenabled,theSASeries
AppliancestoresusercookiesforWebsitesthatissuepersistentcookies
Persistentuserpasswords—ifthepasswordcachingfeatureisenabled,theusercan
choosetostorehercredentialsforapplicationsandWebsites
Usersession—Thisstateistransientanddynamic.Theusersessionconsistsofthe
followingdata:
TheuserSASeriesAppliancesessioncookie
Transientuserprofileinformation,whichincludescookiesandpasswordsstored
onlyforduringtheuser’ssession
Monitoringstate—Thispersistentinformationconsistsoflogmessages.
WhetheryoudeployaclusterinActive/PassiveorActive/Activemode,theSASeries
Applianceisresponsibleforsynchronizingdatabetweenclustermembers.TheSA
SeriesAppliancesynchronizesallsystemdata,userprofiledata,andtheSASeries
usersessioncookiesimmediately,soifoneclustermembergoesoff-line,usersdonot
needtosignintotheSASeriesApplianceagain.Asmallamountoflatencyoccurs
whentheSASeriesAppliancesynchronizesusersessionprofileandmonitoringstate
data,soifamembergoesoff-line,theusermayneedtosignintosomeback-endWeb
applicationsagainandadministratorsmaynothaveaccesstothelogsonthefailed
machine.
Ifyounoticetoomuchlatencyoccurringononeormorenodes,youmightneedto
changetheClusteringTimeoutsSettings.
WhenyouaddanSASeriesAppliancetoacluster,theclusterleaderdoesnotsend
logmessagestothenewmember.Logmessagesarealsonotsynchronizedbetween
clustermemberswhenonememberrestartsitsservicesorwhenanofflinemachine
comesbackonline.Onceallmachinesareonline,however,logmessagesare
synchronized.
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NOTE: Ifyouarerunninganactive/activecluster,youmustnotallowthe
clustertoswitchtoactive/passivemodeunlesstheactive/activeand
active/passiveclusterssharecompatiblespreadtimeoutsettings.
Youmayalsoconfiguresynchronizationsettingstoimproveperformance:
Specifythesynchronizationprotocol—WhenrunningthreeormoreSASeries
Appliancesinamulti-unitormulti-sitecluster,youcanchoosetousethe
synchronizationprotocol(Unicast,Multicast,orBroadcast)thatbestsuitsyournetwork
topology.
NOTE: Multicastorbroadcastforclustercommunicationisnotsupported
ontheMAGSeriesJunosPulseGateways.
Synchronizelogmessages—Logmessagesmaycreateahugepayloadonthenetwork
andaffectclusterperformance.Thisoptionisdisabledbydefault.
Synchronizeusersessions—Thisoptionsynchronizesallusersessioninformation
(instancesofaccesstointranetservices,forexample)amongallSASeriesAppliances
inthecluster.
Synchronizelastaccesstimeforusersessions—Thisoptionallowsyoutopropagate
useraccessinformationinthecluster.Ifthisoptionisthesolesynchronizationitem
amongtheclusternodes,youcansignificantlyreduceCPUimpactamongthecluster
SASeriesAppliances.
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Chapter33:Clustering
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NOTE:
Ifyouconfigureyourclusterasactive/passive,theSynchronizeusersessions
andSynchronizelastaccesstimeforusersessionsoptionsare
automaticallychecked.
IfyouselectboththebothSynchronizelogmessagesandSynchronizeuser
sessionscheckboxes,everythingisreplicatedontheclusternodes,including
networkinginformation.Eventhoughnetworkinginformation,including
syslogandSNMPsettings,canbeconfiguredpernodeorpercluster,allof
thenetworkinginformationissynchronizedbetweennodeswhenthese
twooptionsareset.
Ifyourclusternodeconfigurationshavedivergedduetochangesmadeto
onenodewhileanotherisdisabledorunavailable,theSASeriesAppliance
managestheremergingoftheconfigurationsautomatically,forupto16
updates.Beyondthemaximumnumberofallowableupdates,youmay
needtointerveneandremergetheconfigurationsmanually.Insome
instances,theSASeriesAppliancemaybeunabletoremergethe
configurationsifthereisnotenoughoverlappingconfigurationinformation
betweentwonodestomanagetheinternodecommunication.
Forexample,givenatwo-nodeclusterinwhichthetwonodesare
partitionedfromeachotherbecauseofanetworkoutage,iftheinternal
networkIPaddressofoneofthenodesgetschangedinoneofthepartitions,
thetwopartitionsareunabletorejoin,evenwhenthenetworkisrepaired.
Insuchacase,youmustmanuallyremergetheconfigurations.
Related
Documentation
DeployingTwoNodesinanActive/PassiveClusteronpage852
DeployingTwoorMoreUnitsinanActive/ActiveClusteronpage854
SpecifyingActive/Passive,Active/Active,andOtherClusterSettingsonpage858
SpecifyingActive/Passive,Active/Active,andOtherClusterSettings
UsethePropertiespagetochangethenameofacluster,specifyinwhichconfiguration
torunacluster(active/passiveoractive/active),specifysynchronizationandnetwork
healthchecksettings,ordeleteacluster.
Tomodifyclusterproperties:
1.
Fromtheadminconsoleofanactiveclustermember,selecttheSystem>Clustering
>ClusterPropertiespage.
2.
EditthenameoftheclusterintheClusterNamefieldtochangethecluster’sname
(optional).
3.
UnderConfigurationSettings,selectoneofthefollowingoptions:
Active/Passivetorunaclusterpairinactive/passivemode.Then,specifyaninternal
VIP(virtualIPaddress)andanexternalVIPiftheexternalportisenabled.
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NOTE: Torunatwo-unitclusterinactive/passivemode,theSASeries
Appliancesmustresideonthesamesubnet.
Active/Activerunsaclusteroftwoormorenodesinactive/activemodeusingan
externalloadbalancer.
NOTE: Tochangeatwo-unitactive/passiveclustertoanactive/active
clusterwithmorethantwonodes,firstchangetheconfigurationofthe
two-unitclustertoactive/activeandthenaddtheadditionalnodes.
4.
UnderSynchronizationSettings,specifyoneormoretypesofdatatosynchronize
usingthefollowingoptions:
Synchronizelogmessages—PropagatesalllogmessagesamongalloftheSA
SeriesAppliancesinthecluster.
Synchronizeusersessions—Synchronizesallusersessioninformation(instances
ofaccesstointranetservices,forexample)amongallSASeriesAppliancesinthe
cluster.
Synchronizelastaccesstimeforusersessions—Propagatesthelatestuseraccess
informationacrossthecluster.
NOTE:
IfyouselectbothSynchronizelogmessagesandSynchronizeuser
sessionscheckboxes,everythingisreplicatedontheclusternodes,
includingnetworkinginformation.Eventhoughnetworkinginformation,
includingsyslogandSNMPsettings,canbeconfiguredpernodeor
percluster,allofthenetworkinginformationissynchronizedbetween
nodeswhenthesetwooptionsareset.
IfyouareusingaloadbalancerinconjunctionwiththeSASeries
Appliance,werecommendyoucleartheSynchronizelastaccesstime
forusersessionscheckbox.
ClearingtheSynchronizelastaccesstimeforusersessionscheckbox
todisableitoffcangreatlyimproveclustersynchronization
performance,disablingthisoptionwhileusersareconnectedtothe
SASeriesAppliancecanresultinclient-sidewarningsinformingthe
userthatthesessionisabouttoexpire.Thesewarningsare
automaticallygeneratedbecauseoftime-stampmismatchesand
theusersessionsdonotactuallydisconnect.
5.
UnderNetworkHealthcheckSettings,specifythenumberofARPpingfailuresallowed
beforetheSASeriesAppliances’internalinterfaceisdisabledandwhetherornotto
disabletheSASeriesAppliances’externalinterfaceiftheinternalinterfacefails.
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Chapter33:Clustering
6.
SelecttheAdvancedSettingscheckboxtospecifythetimeoutsfortheunderlying
clustersystem.Donotchangeanyvaluesunderthissettingunlessinstructedtodo
sobyJuniperNetworksTechnicalSupport.
7.
ClickSaveChanges.
Related
Documentation
TaskSummary:DeployingaClusteronpage847
DeployingTwoNodesinanActive/PassiveClusteronpage852
DeployingTwoorMoreUnitsinanActive/ActiveClusteronpage854
AddingMultipleClusterNodes
Toaddmultiplenodestoacluster:
1.
SelectSystem>Clustering>ClusterStatus.
2.
ClickAddMembers.
3.
EnterthenodenameandinternalIPaddress.
4.
Modifyoraddthedefaultinternalnetmaskandinternalgatewayaddresses,if
necessary.
5.
ClickAdd.
6.
Repeattheprocessuntilyouhaveaddedallofthenodes.
7.
ClickSaveChangestosavethenodeconfigurations.
TheSASeriesApplianceautomaticallyenablestheaddedclusters,eveniftheyare
unreachable.
Related
Documentation
TaskSummary:DeployingaClusteronpage847
DeployingTwoNodesinanActive/PassiveClusteronpage852
DeployingTwoorMoreUnitsinanActive/ActiveClusteronpage854
GeneralClusterMaintenance
ManagingNetworkSettingsforClusterNodes
Tomodifythenetworksettingsforaclusteroreachindividualnodeinacluster,click
System>Network.YoucanmakeyourchangesontheNetworkSettingspages.After
youcreateacluster,thesepagesprovideadrop-downlistfromwhichyoucanselectthe
entireclusteroraspecificnodetomodify.WhenyousavechangesonaNetworkpage,
thesettingsaresavedforthespecifiedclusterorclusternode.Ifyouchangenetwork
settingsforanentirecluster,theypropagatetoeverynodeinthecluster.
Youcanaccessanode-specificNetworkpagebyclickingSystem>Clustering>Cluster
Statusonthenode’snameintheMemberNamecolumn.
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UpgradingClusteredNodes
TheSASeriesApplianceofferstheabilitytoeasilyupgradeeverynodeinacluster.You
simplyinstallanewerservicepackageononenodeand,oncetheinstallationcompletes
andthenodereboots,thenodepushestheservicepackagetoallnodesinthecluster.
UpgradingtheClusterServicePackage
Installanewerservicepackageononeclusternodeonly.Whentheinstallationprocess
completesandtheclusternodereboots,itinstructstheothernodestoupgrade.
Related
Documentation
SynchronizingtheClusterStateonpage855
AddingMultipleClusterNodesonpage860
ChangingtheIPAddressofaClusterNode
ChangingtheIPaddressofaclusterwhileitbelongstoaclusterisnotsupported.Inorder
tochangetheIPaddress,youmustfirstremoveitfromthecluster,updatetheIPaddress
andthenadditback.
NOTE: IfyouattempttochangetheIPaddressofanodewhileitbelongsto
acluster,youmayexperienceunpredictableresults.
Forexample:
1.
SelectSystem>Clustering>Clusterstatus.
2.
SelectthecheckboxnexttothenameofthenodewhoseIPaddressyouwantto
change.
3.
ClickRemove.
4.
Afterthenodeisremoved,signintothatnode,changeitsIPaddressandclickSave
Changes.
5.
Inthemainnode,addthechangednodetotheclusterconfigs.
6.
Logintothechangednodeandrejointhecluster.
ThefollowingisanexampleforchangingbothnodeIPaddressesinanactive/passive
cluster:
1.
SelectSystem>Clustering>Clusterstatus.
2.
ClickDeleteCluster.
3.
ChangetheIPaddressofeachnode.
4.
Logintothemainnodeandre-createthecluster,changingfromactive/activeto
active/passiveanddefiningtheinternaland/orexternalVIPaddresses.
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Chapter33:Clustering
5.
Addtheothernodetotheclusterconfigs.
6.
Logintothepassivenodeandjoinittothecluster.
Related
Documentation
DeployingTwoNodesinanActive/PassiveClusteronpage852
GeneralClusterMaintenanceonpage860
DeletingaClusteronpage862
DeletingaCluster
Ifyoudeleteacluster,allofthenodesbeginrunningasstandaloneSASeriesAppliances.
Todeleteacluster:
1.
Fromtheadminconsoleofanactiveclustermember,selecttheSystem>Clustering
>ClusterStatuspage.
2.
Selectthecheckboxnexttoeachclusternodeyouwanttodelete.
3.
ClicktheRemoveClusterbutton.
4.
Whenprompted,clickRemove.
Related
Documentation
GeneralClusterMaintenanceonpage860
RestartingorRebootingClusteredNodes
WhenyoucreateaclusteroftwoormoreSASeriesAppliances,theclusteredSASeries
Appliancesactasalogicalentity.Assuch,whenyourestartorrebootoneoftheclustered
SASeriesAppliancesusingeithertheserialconsoleortheadminconsole,allSASeries
Appliancesintheclusterrestartorreboot.
Related
Documentation
SerialConsoleProceduresonpage868
ConfiguringtheExternalVIPforAnActive/PassiveCluster
ToaddanexternalVIPtoanexistingA/Pcluster:
1.
CreateanA/Pclusterwithonlytheinternalportconfigured.
2.
SelectSystem>Clustering>ClusteringPropertiesandaddtheinternalVIP.
3.
SelectSystem>Network>ExternalPort.
4.
FromtheSettingsformenu,select“entirecluster”.
5.
AddtheNetmaskandDefaultGatewaybutleavetheexternalportdisabled.
6.
Foreachnode,selectSystem>Network>ExternalPortandconfiguretheexternal
portIPaddressbutleavetheexternalportdisabled.
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7.
AddtheexternalclusterVIP.
8.
SelectSystem>Network>ExternalPort,select“entirecluster”fromtheSettings
formenuandenabletheexternalport.
Related
Documentation
SpecifyingActive/Passive,Active/Active,andOtherClusterSettingsonpage858
AdminConsoleProcedures
Table37onpage863describestheinformationdisplayedontheStatustabandthevarious
managementtasksyoucanperform,includingdisabling,enabling,andremovinganSA
SeriesAppliancenodefromacluster.
Table37:ClusterStatusPageInformation
Description
UserInterfaceElement
Screendisplaystheclustername,type,configuration,internalVIP,
andexternalVIPforanactive/passivecluster.
StatusInformationlabels
ClickthisbuttontospecifyanSASeriesAppliancethatwilljointhe
cluster.YoumustperformthisstepforSASeriesApplianceyouintend
toaddtothecluster.Byclickingthisbutton,youcanaddmultiple
nodesatthesametime.
AddMembersbutton
Clickthisbuttontoaddanodethatwaspreviouslydisabled.When
youaddanode,allstateinformationissynchronizedonthenode.
Enablebutton
Clickthisbuttontodisableanodewithinthecluster.Thenoderetains
awarenessofthecluster,butdoesnotparticipateinstate
synchronizationsorreceiveuserrequestsunlessmemberssigninto
thenode,directly.
Disablebutton
Clickthisbuttontoremovetheselectednodeornodesfromthe
cluster.Onceremoved,thenoderunsinstand-alonemode.
Removebutton
Clickthisbuttontofail-overtheVIPtotheothernodeinthe
active/passivecluster.Onlyavailableifclusterisconfiguredas
active/passive.
Fail-OverVIPbutton
Listsallnodesbelongingtothecluster.Youcanclickonanode’s
nametomodifyitsnameandnetworksettings.
MemberNamecolumn
ShowstheinternalIPaddressoftheclustermemberusingClassless
InterDomainRouting(CIDR)notation.
InternalAddresscolumn
ShowstheexternalIPaddressoftheclustermemberusingCIDR
notation.NotethatthiscolumnonlyshowstheexternalIPaddress
oftheclusterleaderunlessyouspecifyadifferentaddressforthe
nodeonitsindividualnetworksettingspage,whichisaccessibleby
clickingonitsnameintheMemberNamecolumn.Ifyouchangethe
externalIPaddressontheNetwork>NetworkSettingspage,the
changeaffectsallclusternodes.
ExternalAddresscolumn
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Chapter33:Clustering
Table37:ClusterStatusPageInformation (continued)
Description
UserInterfaceElement
Showsthecurrentstateofthenode:
Greenlight/enabled—Thenodeishandlinguserrequestsand
participatinginclustersynchronization.
Yellowlight/transitioning—Thenodeisjoiningcluster.
Redlight/disabled—Thenodeisnothandlinguserrequestsor
participatinginclustersynchronization.
Redlight/enabled,unreachable—Thenodeisenabled,butdue
toanetworkissue,itcannotbereached.
Note:Anode’sstateisconsidered“stand-alone”whenitis
deployedoutsideofaclusterorafterbeingremovedfromacluster.
Statuscolumn
Showsthestatusofthenode’sconnectiontothecluster:
OK—Thenodeisactivelyparticipatinginthecluster.
Transitioning—Thenodeisswitchingfromthestand-alonestate
totheenabledstate.
Unreachable—Thenodeisnotawareofthecluster.Acluster
membermaybe“unreachable”evenwhenit’sonlineandcanbe
pinged.Possiblereasonsinclude:itspasswordisincorrect,itdoesn’t
knowaboutallclusternodes,it’sconfiguredwithadifferentgroup
communicationmode,it’srunningadifferentservicepackage
version,orthemachineisturnedoff.
Notescolumn
Specifiesthesynchronizationorderfornodeswhenrejoiningacluster.
Acceptssyncranksfrom0(lowestrank)to255(highestrank).The
highestranktakesprecedence.Wheretwonodeshaveidenticalsync
ranks,thealpha-numericrankofthemembernameisusedto
determineprecedence.
Note:
SyncRankcolumn
Updatesthesyncrankafteryouchangetheprecedenceofthenodes
intheSyncRankcolumn.
Updatebutton
Related
Documentation
TaskSummary:DeployingaClusteronpage847
GeneralClusterMaintenanceonpage860
MonitoringClustersonpage864
MonitoringClusters
YoucanmonitorclustersusingthestandardloggingtoolsprovidedbytheSASeries
Appliance.Inparticular,youcanuseseveralcluster-specificSNMPtrapstomonitor
eventsthatoccuronyourclusternodes,suchas:
Externalinterfacedown
Internalinterfacedown
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