Monday 8 February 2016

JBoss Application Server Tutorial - Online training

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JBoss Application Server Tutorial online training

JBoss Application Server Tutorial online training

JBoss Application Server Tutorial can be booted in two different modes. A managed domain allows you to run and manage a multi server topology. Alternatively, you can run a standalone server instance. For many use cases, the centralized management capability available via a managed domain is not necessary. For these use cases, a JBoss Application Server Tutorial instance can be run as a "standalone server". A standalone server instance is an independent process, much like a JBoss Application Server instances is. Standalone instances can be launched via the standalone.sh or standalone.bat launch scripts. If more than one standalone instance is launched and multi server management is desired, it is the user's responsibility to coordinate management across the servers. Online Training For example, to deploy an application across all of the standalone servers, the user would need to individually deploy the application on each server.
It is perfectly possible to launch multiple standalone server instances and have them form an HA cluster, just like it was possible with JBoss Application Server Tutorial. One of the primary new features of JBoss Application Server Tutorial is the ability to manage multiple JBoss Application Server instances from a single control point. A collection of such servers is referred to as the members of a "domain" with a single Domain Controller process acting as the central management control point. All of the JBoss Application Server instances in the domain share a common management policy, with the Domain Controller acting to ensure that each server is configured according to that policy. Domains can span multiple physical machines, with all JBoss Application Server instances on a given host under the control of a special host controller process. One host controller instance is configured to act as the central domain controller. The host controller on each host interacts with the domain controller to control the lifecycle of the application server instances running on its host and to assist the domain controller in managing them.

Host Controller of JBoss Application Server:

When the domain.sh or domain.bat script is run on a host, a process known as a host controller is launched. The Host Controller is solely concerned with server management; it does not itself handle application server workloads. The host controller is responsible for starting and stopping the individual application server processes that run on its host, and interacts with the domain controller to help manage them.
Each host controller by default reads its configuration from the domain/configuration/host.xml file located in the unzipped JBoss Application Server Tutorial installation on its host's file system. The host.xml file contains configuration information that is specific to the particular host. Primarily:
  • The listing of the names of the actual JBoss Application Server 7 instances that are meant to run off of this installation.
  • Configuration of how the Host Controller is to contact the Domain Controller to register itself and access the domain configuration. This may either be a configuration of how to find and contact a remote Domain Controller, or a configuration telling the Host Controller to itself act as the Domain Controller.
  • Configuration of items those are specific to the local physical installation. For example, named interface definitions declared in domain.xml can be mapped to an actual machine-specific IP address in host.xml. ( learn java online ) Abstract path names in domain.xml can be mapped to actual files system paths in host.xml.
One host controller instance is configured to act as the central management point for the entire domain, i.e. to be the domain controller. The primary responsibility of the domain controller is to maintain the domain's central management policy, to ensure all JBoss Application Server Tutorial are aware of its current contents.