Clustering in Was _ Ibm Was Interview Answers

8/22/2014 CLUSTERING IN WAS | IBM WAS INTERVIEW ANSWERS

http://karim05501.blogspot.in/2012/10/clustering-in-was.html 1/5

T u e s d a y , 3 0 O c t o b e r 2 0 1 2

CLUSTERING IN WAS

CLUSTERING IN WAS

Def of CLUSTERING : It is a set of AppServers having same applications

Installed,Grouped locally for WORKLOADMANAGEMENT (WLM)

(or)

-----> Grouping of AppServers under a single application / name

-----> Using Clustering we can create a scope and achieved through

WORKLOADMANAGEMENT and FAILOVER

(OR)

-----> Every cluster member must have the same configuration and same version.We can

say each cluster member is the clone to one another.

-----> Clustering concept is for High Availability and and Workload Management.

Q) How to install an application in one cluster member out of multiple

members?

A) One cannot deploy application in one cluster member alone in the clustered

environment since application which is deployed in one cluster member will be shared

across to the other cluster members automatically. So logically it is equivalent, installing

application in cluster level.

----> Make the "cluster member weight" where you DONT want the application to be

installed as Zero.

There are 2 types of CLUSTERING

1) VERTICAL CLUSTERING : Deployed the application on one machine and we can run

that application on our own box(or) machine.

S e a r c h T h i s B l o g

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VIRTUAL HOSTS IN WAS

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WSADMIN OBJECTS

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A v a i l a b l e H e r e



----> In this Vertical Clustering Machine FailOver is not possible.

----> If the machine gets failed we cannot run that application (or) SINGLE POINT

OF FAILURE.

---> If one Server fails the other Server will takes care

----> If machine fails nothing can be done.

(OR)

-----> All the JVMs resides on the same physical machine along with the DMGR.

-----> When the JVM failover happens other JVM in that cluster will handle the request as

part of the High Availability.

-----> But when the physical machine failover happens we will lose every thing

2) HORIZONTAL CLUSTERING : Grouping of AppServers in which one AppServer

should be on one node and Another AppServer should be on another node.

-----> Means if we take two machines one application should be deployed on

different machines Remotely (or) one application should run in INDIA and another

application should run in AMERICA.

-----> If Machine1 application will be deployed on Machine2 so we have to know the

IP address of Machine1 then only it is possible to deployed that application

Successfully.

----> Both Machines should have Internet Connection.

----> Here no SINGLE POINT OF FAILURE.

----> It Supports MACHINE FAILOVER.

(OR)

-----> DMGR and the JVMs resides on the different machines.This will work even when

the physical machine failover is happened.

WORKLOADMANAGEMENT : Sharing requests across Multiple Servers.

SCALABILITY : can add 2/3 members or add a cluster member to existing

member

LOADBALANCING : Allocate workload proportionality among available resources.

AVAILABILITY : System runs if server fails with Clustering. (or)

----> Applications are still available if a server fails.

Q) What is work load manager in WebSphere? What is the default work load

management policy?

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A) ----> Workload management (WLM) is a WebSphere facility that provides load

balancing and affinity between application servers in a WebSphere clustered

environment.

----> WLM is an important fact of performance. WebSphere uses workload management

to send requests to alternate members of the cluster.

----> WebSphere can also be configured to route concurrent requests from a user to the

application server that serviced the first request. This is called session affinity and can be

used to maintain a users session over concurrent HTTP requests.

----> WLM is configurable. The administrator should ensure that each machine or server in

the configuration processes share the overall client load that is being processed by the

system as a whole.

----> Workload should be spread among machines such that the workload corresponds to

the machine processing power.

Q) What is High Availablity in WebSphere?

A) ----> High Availability means nothing but clustering concept .

----->Application should be live for the 365 day for those kind of application they kept in

cluster. When the request comes from client it should handle. this concept is called as high

availablity

(0R)

-----> Application availability for the users who are using it.

------> We can provide the high availability by installing the application in different cluster

members.

-----> In case one of the Application Servers fails other Application server which is in the

cluster group will server the request so then the customer request can served quickly.

VERTICAL CLUSTER CONFIGURATION :

STEP 1: Goto Cluster.

STEP2 : Click New.

STEP3: Give Cluster Name.

STEP4 : Prefer LOCAL (By default enable)

STEP5 : Click Next Button.

STEP6: Add Cluster Member 1

STEP7 : Weight (2 Members ---> Equivalent weight)

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SSL (SECURED SOCKET LAYER)

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A b o u t m e

KA RIM ULLA

V I EW MY CO MPLETE

PRO FI LE

W e b S e r v V sA p p S e r v

The main responsibility of Webserver isto serve static requestwhile Appserver isused for dynamic request.Moreover,Webserver handle http requests andalso acts like a load balancer whileAppserver has large area of works likesecurity, performances, clustering,support for variousfiles(.ear,.war)deployments etc

W e b S p h e r eF o l l o w e r s



STEP8 : Add Cluster Member2

STEP9 : Generate unique HTTP ports.

STEP10 : Click Finish Button.

STEP11 : Select Scope.

STEP12 : Controlling Cluster.

STEP13 : Start Cluster Member1

STEP14 : Start Cluster Member2

STEP15 : LogOut from AdminConsole.

STEP16 : Again LogIn to AdminConsole.

STEP17 : See in AdminConsole both Clusters are started.

(or)

STEP BY STEP FOR CREATING CLUSTERS.

STEP 1 : ND - None Installation.

STEP 2 : Create 3 profiles DMGR , APPSRV1 , CUSTOM.

STEP 3 : Federation (APPSRV1 , CUSTOM) ------> DMGR.

STEP 4 : IHS (WEB SERVER + PLUG-IN )

STEP 5 : Map Web Server Instance in DMGR.

STEP 6 : Cluster Creation (Node A) ----> SRV 2

(Node B) -----> SRV 1

STEP 7 : Deployed Application under Cluster or Web Server Scope

STEP 8 : Ensure PLUG-IN Generation and Propogation.

STEP 9 : Restarts (SERVER 1 , SERVER 2 , WEB SERVER)

Pos t ed by Kar im Ulla at 10:00

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Clustering in Was _ Ibm Was Interview Answers