《WebLogic Architecture》.pdf

Internal Use Only Extreme (WLS/Java) Performance Workshop WebLogic Server Architecture Robert Patrick, Vice President FMW Architects Team: The A-Team Agenda • Domain Architecture • Server Architecture • Clustering Architecture • JDBC Architecture Domain Architecture WebLogic Server Terminology • Server (aka. Instance) – a single JVM process running the WebLogic Server software • Machine/Node – a computer with its own CPU, memory, secondary storage that is running its own copy of the operating system • Domain – the collection of WebLogic Server-related processes whose configuration is stored and maintained by a single Administration Server Domain Architecture WebLogic Server Terminology • Admin Server – a WebLogic Server instance responsible for storing, maintaining, and administering the configuration of all other WebLogic Server instances and clusters in its domain • Managed Server – any WebLogic Server instance managed by the Admin Server • Cluster – a loosely coupled grouping of WebLogic Server instances that act as a single server to provide load distribution and some fault tolerance to hosted apps • Node Manager – optional daemon process on each machine, which provides server start/restart/monitoring capabilities and plays role in whole server migration Domain Architecture Overview Domain Architecture Admin Server • Central Admin Point • Manages Domain Config • Supports batching • Manages App Deployment • All functionality implemented via JMX • Admin Console • WLST • Interactive Command Interpreter • Jython based Scripting • Custom JMX programs Domain Architecture Node Manager • Small daemon process • Start/St