BASICS OF NETWORK DEPLOYMENT

       BASICS OF NETWORK DEPLOYMENT  



PREREQUISITES OF ND : To create Cluster Minimum requirements



1) ND Software

2) High End Server with atleast 2 GB RAM

3) Main Memory 2 GB

4) DMGR 256 MB

5) Node Agent 256 MB

6) 2 App Servers 1 GB each

7)  DMGR+ App Server

8) More than 1.5 GHZ Processor.



Q) What is ND (NETWORK DEPLOYMENT) ?



A) -----> Grouping of Multiple App Servers on a single machine for operations.

     ------> Contains special node name DMGR (DEPLOYMENT MANAGER)

     -------> Contains Node Agent ( JVM process manages servers on a  Node)

     -------> Created automatically after federation

    -------> You can configure only one Web Server definations for StandAlone and Multiple for ND (N- number)




FLOW OF NETWORK DEPLOYMENT IN WAS : 




STEP 1  : Node Synchronization Application goes to DMGR and Master Sync's and gives to nodes.

STEP 2 : DMGR is responsible for managing all files at nodes.

STEP 3  : Changes cannot be done in Node Agents we should do it in Master Repository first.

STEP 4 : Only done when Node Agent is Up (means it is in Running mode) 




Q) What is Cell ?



A) ----> It is a Collection of Nodes 

    -----> It is a High-level entity which we can represent logical operations 

   -----> Holds Configuration repository for entire management domain is called Cell.

  -----> For Cell we can federate the nodes, on the node we can configure Application Servers or with in a cell admin Console runs inside DMGR




Q) What is Node  ?



A) Collection of JVM machines or App Servers.




Q) What is Node Agent ?



A)  -----> Node Agent is the mediator  or Communicator between Node and Cell (or) DMGR  and Application Server.

     ----->  If the Node Agent is up  then only you can see the Server Status in Admin Console.

     -----> Their is no option for starting the Node Agent from Admin Console we have to start at only Command mode

    -----> A Server is created called Node Agent  which mediates DMGR to federated node.



Q) What is federation ?



A) -----> Adding Application Server node to DMGR Node
                          
                                 (or)

      -----> Adding Node Agent to DMGR.

    

Types of Servers in ND :



1) DMGR Server.

2) Node Agent.

3) Application Server.




Q) How to federate ?



A) Goto Admin Console ------> we can federate only App Server 

  -----> ./Addnode.sh <host name> <dmgr port>




PREREQUISITES OF FEDERATION :

1) DMGR Should be Up.

2) If Console, App Server Up.

3) Using Addnode , no need to Start the Server.