With
Network Deployment, you can use application server clustering to enhance
workload
distribution. A cluster
is
a logical collection of application server processes that provides workload
balancing and high availability.
Application
servers in a cluster are members of that cluster and must all have
identical
application components on them. Other than the applications on them, cluster
members do not have to share any other configuration data.
For
example, one cluster member might run on a large multi-processor server
while another
member of that same cluster might run on a small mobile computer. The server
configuration settings for each of these two cluster
members
is very different, except the application components that are assigned
to them. In that
area of configuration, they are identical. The members of a cluster can be
located on a single node (vertical cluster), across multiple nodes (horizontal cluster), or on a
combination of the two.
When
you install, update, or delete an application, the updates are automatically
distributed to
all members in the cluster. In WebSphere Application Server V5, if
you updated an
application on a cluster, you had to stop the application on every
Server in the
cluster, install the update, and then restart the server. With
WebSphere
Application Server V6, the Rollout Update option allows you to
update and
restart the application servers on each node, one node at a time.
This provides
continuous availability of the application.
CREATION OF CLUSTERS:
Open the
admin console of deployment manager
In left hand side console
à Select the server
- Application Servers
- WebServers
- Generic Servers
- JMS Servers
-
Clusters
-
Cluster Topology
à
Click on: Clusters
n Click
on: New
n Enter
the cluster name: Sumanth (name of the cluster)
à
Existing Server
0 : Do not include an existing server in this
cluster (in this we can create new servers)
0:
Select an existing server to add to this cluster ( in this we can select the
servers already which are created)
Note: if you want create the new server the click on : Do
not include an existing server in this cluster
n Click
on next
Member name : server1 (name of the server)
Click on : apply
If you want to
create one more server: enter the member
name again
n Click
on next
è If you want to use the existing server click on :
Select an existing server to add to this cluster
n Browse
for the path the server
D:\IBM\WebSphere\AppServer\profiles\Dmgr01\config\cells\mirdev81Cell01\nodes\mirdev81CellManager01\servers
n Click
on : next
è Summary (it will show all the select components to
create the cluster)
è Click on : FINISH
è Click on : SAVE
è
Expand + total changes document: 30 (in total it
tells about the servers)
è
Synchronize changes with Nodes
TO SEE THE PORT NUMBERS:
è
Click on selected server
ex: server2
à Click on Ports
à Wc adminhost : in this
we can see the port number
TO START THE
CLUSTER:
à Select the server
- Application Servers
- WebServers
- Generic Servers
- JMS Servers
-
Clusters
- Cluster Topology
è
Click on : Clusters
select name status
sumanth
è Click on: Start (it
will start the cluster and shows in status)
NOTE: if the cluster not started,
then start the each server in the cluster)
Open the
admin console of deployment manager
In left hand side console
à Select the server
- Application Servers
- WebServers
- Generic Servers
- JMS Servers
-
Clusters
-
Cluster Topology
è
Select the Application server
à
Click on : install new application
è
Path of the new application
n Local
file system
n Remote
file system
à
click on Local file system : EJB.War (
Browse for the location the file)
NOTE: select the
War File or Ear File
WAR FILE: Web Arch File
EAR File : Enterprise Arch
èContext
Root : naidu (name of the context root, by this name we will open the browser
later)
à
Click on : next
è
Application security warning
à Click on : continue
è
Select installed options
à Click on : next
è
Map modules to server
Select Modules URL
Server
EJB Client Client.waR, WebSphereCell=
WEB-INF/ mirdev30cell01,
WEB.XML node=mirdev30node01, server=server1
è
Cluster and Server: webspherecell=miredv30cell01, cluster=sumanth
NOTE: the
above clusters and servers shows, the
clusters and server which are already created and select the required cluster
to deploy the application.
è
Select the cluster sumanth
à
Click on : Apply
à
Click on : next
à
Click on : next
à
Click on : Finish
è Save the master
configuration
à
Click on : save
è select the war file
and start
NOTE : after creation of cluster,
Go to the browser
sumanth
: cluster root name
9081
: port number (wc dafault host)
TO SEE THE PORT NUMBER:
à servers
à servers
n Application
server
Click on required server and click
on ports
-- Wc dafault host
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