02-Wls Topologies Intro

8/6/2019 02-Wls Topologies Intro

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Introduction to WLS Topologies


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Agenda

Topology

Domain

Server

Admin Server

Managed Server

Cluster

Node Manager

Machine

Configuration Files Administration Tools Sample Configuration Schemes


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Domain

What is it?

a logically related group of WebLogicServer instances that you managefrom a single set of configurationartifacts.

Whats in a domain?

Servers

Clusters of servers Rules:

All WebLogic Server instances withinthe same domain must be at thesame major and minor version.

Servers within a domain can be at

different Maintenance Pack levels aslong as the Administration Server isat the same Maintenance Pack Levelor higher than its Managed Servers.

config.xml


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Server

What is it?

A configured instance to hostapplications and resources

WebApps, Enterprise Apps,

Web Services, JMS, JDBC, Diagnostics,

What types of servers are

there? Administration Server

Managed Server

JNDI

JMS Queue

JDBC Pool


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Administration Server

What is it? Central configuration controller for the entire

domain What else does it do?

Hosts the Administration Console Enables you to start and stop servers from a

central location Enables you to migrate servers and services

within the domain

Enables you to deploy applications withinthe domain

Guidelines: There must be exactly one* Administration

Server in domain An Administration Server controls only one

domain.

For production use, we recommend nothosting application logic or resources on theAdministration Server

*The Administration Server does not need to run at all times, but is required for makingconfiguration and deployment changes to a running domain.

Admin Server

Managed Servers

config.xml

Admin Console


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Managed Server

What is it? A running instance that hosts

applications and resources needed bythose applications - The real workhorses in a WebLogic domain

Each Managed Server is independentof all other Managed Servers in thedomain (unless they are in a cluster,defined later)

You can have as many Managed

Servers in a domain as you need Individual Managed Servers are

typically added for capacity andapplication isolation

JND

I

JMSQueue

JDBC Pool


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Administration Server to Managed ServerInteraction

The Administration Server stores the mastercopy of the domain configuration, including theconfiguration for all managed servers in thedomain

Each Managed Server stores a local copy of itsconfiguration.

When a Managed Server starts, it connects tothe Administration Server to synchronize theconfiguration

When configuration is changed, theAdministration Server sends changedconfiguration to Managed Servers


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Cluster

A cluster is a group of ManagedServers running simultaneouslyand working together to provideincreased scalability andreliability

Scalability: through parallelism

Reliability/Availability: through

replication and redundancy

A cluster appears as a singleinstance to most clients.

Clusters enable some advancedfeatures, such as Whole ServerMigration, Service Migration, andclustered JMS destinations.

Cluster 1

Cluster 2

Admin Svr


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Agenda

Topology

Domain

Server

Admin Server

Managed Server

Cluster

Node Manager

Machine



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Domain DirectoryDomain name

Start and stopscripts

Root configuration forthe domain

Configuration files for

WLDF, JDBC, JMS,and Security

Pending configurationchanges

Subdirectory for each ManagedServer in the domain


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Two-Phase Configuration Changes

Changes activated in batches:

Reliability, consistency:

Make (related) changes as a group

Validate before making the change

Activate or Roll back as a single unit( all changes on all servers

General process: Get an edit lock

make changes

changes are stored in the pending directory

activate your changes (with implicit validation through the Admin

Console or WLST) changes are distributed to servers in the domain

Two phases: prepare and commit

Prepared on all servers; any failures will cause total rollback


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Agenda

Topology

Domain

Server

Admin Server

Managed Server

Cluster

Node Manager

Machine



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Administration Tools

Configuration Wizard

GUI/scriptable tool to create and extend WebLogic domains Template based

Administration Console

Browser-based tool for configuring and monitoring domains,deploying applications, and controlling servers

WebLogic Scripting Tool (WLST) Script or command line tool to do the same thing as theAdministration Console and Configuration Wizard

Note that we will cover details on WLST in a separate document

weblogic.Admin

Deprecated command line tool for configuring a domain

Recommend using WLST instead

weblogic.Deployer

Command line tool for deploying applications


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Configuration Wizard

Wizard that walks you throughdomain creation off line

Not intended to run against arunning domain

Requires a domain template

WLS ships with a defaulttemplate and templates forsamples domains

Customers and layered productscan create their own templates

Can be executed in graphical

and console mode No equivalent tool existed in

OC4J


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Administration Console

Graphical interface to configure,

manage, monitor a domain One Administration Console for

each domain

The Administration Server in thedomain hosts the Admin Console

application Open the Admin Console with the

following URL:

http://host:port/console

Typically in dev:

http://localhost:7001/console Similar to the OC4J Oracle

Enterprise Manager ApplicationServer Control
http://localhost:7001/consolehttp://localhost:7001/console


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Automation with Domain Templates

Configuration Wizard and Domain Template Builder

GUI/scriptable tool to generate templates from existing domains

Scriptable with WLST to clone domains to multiple environments

Fusion Middleware Templates Out of the Box

SOA, WebCenter, Identity

ManagedServer 1

Domain

ManagedServer 2

App 1

App n

Res n

Res 1

ManagedServer 1

Domain

ManagedServer 2

App 1

App n

Res n

Res 1

ManagedServer 1

Domain

ManagedServer 2

App 1

App n

Res n

Res 1

ManagedServer 1

Domain

ManagedServer 2

App 1

App n

Res n

Res 1

Domain Template Builder

Build Template of Domain

Env 1 Env 2 Env n


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Agenda

Topology

Domain

Server

Admin Server

Managed Server Cluster

Node Manager

Machine



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Single Server/DevelopmentConfiguration

Single server acts asthe AdministrationServer and as a hostfor applications

Not recommended forproduction, butstandard fordevelopment

JNDI

JMS Queue

JDBC Pool

config.xml

Admin Console


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Configuring for Application Isolation

Deploy applicationsto their own servers

Admin server on itsown server (highlyrecommended)

Each managedserver on its ownphysical server

Admin Server

Managed Server

Node Manager

A1 A2 A3


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Configuring for Extreme ApplicationIsolation

Each applicationgets its owndomain

Admin server on

its own server(highlyrecommended)

Each managed

server on its ownphysical server

A1 A1 A1

A2 A2 A2

Domain 1

Domain 2


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Configuring for High Availability

Clustered servers forHA and scalability

All managed serversin the same clusterare on differentmachines, althoughmachines arefrequently shared

Admin Server

Managed Server

Node Manager

A1

A2 A2 A2

A1 A1

A2

A1


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Configuring for Perf and Utilization

Multiple ManagedServers per machine

All Managed Serversin one cluster

Cluster replicationscheme considerslocation indeterminingsecondary ManagedServers

A1

A1 A1 A1

A1 A1

A1

A1


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Simplified Administration

Multipleapplicationsdeployed to asingle cluster

Admin server onits own server(highlyrecommended)

Single domain tomanage

A1

A2

A3

A1

A2

A3

A1

A2

A3

02-Wls Topologies Intro

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