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more detail in the lesson titled “Configuring Node Managers.” John Eastvold ([email protected]ฺedu) has a non-transferable license to use this Student Guideฺ Unauthorized reproduction or distribution prohibitedฺ Copyright© 2011, Oracle and/or its affiliatesฺ
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Oracle WebLogic Server 11 g : Administration Essentials 5 - 6 Domain: Overview (continued) All other Oracle WebLogic Server instances in a domain are called managed servers. Managed servers host application components and resources, which are also deployed and managed as part of the domain. In a domain with only a single Oracle WebLogic Server instance, that server functions as both the administration server and the managed server. A domain may also include Oracle WebLogic Server clusters, which are groups of server instances that work together to provide scalability and high availability for applications. Clusters can improve performance and provide failover if a server instance becomes unavailable. The servers within a cluster can run on the same machine, or they can reside on different machines. To the client, a cluster appears as a single Oracle WebLogic Server instance. John Eastvold ([email protected]ฺedu) has a non-transferable license to use this Student Guideฺ Unauthorized reproduction or distribution prohibitedฺ Copyright© 2011, Oracle and/or its affiliatesฺ
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Oracle WebLogic Server 11 g : Administration Essentials 5 - 7 Copyright © 2010, Oracle and/or its affiliates. All rights reserved. Domain Diagram Cluster Managed server 3 Domain log Configuration repository GET/SET Get configuration at startup. Send critical domain notifications. Log domain messages Monitor/ update Domain Console Local logging Administration server LOG LOG Managed server 2 Managed server 1 Local logging Local logging LOG LOG Domain Diagram The diagram in the slide shows the critical components of a domain. A domain is an arbitrary logical administration unit that is managed by one administration server. A domain can encompass clusters in different geographies. The administration server is responsible for providing configurations for all servers of a specific domain and for logging critical (configurable) notifications of the domain’s servers. It is also responsible for monitoring managed servers. A managed server is responsible for performing the business logic. A managed server gets its configuration from the administration server at boot time. The managed server is then able to execute independently of the administration server. The administration server registers itself with each managed server so that it can receive critical notifications and run-time server state changes. Note that the only configuration folders and files that play a role are those of the administration server. The configuration folders and files of the managed servers are normally ignored because they download all configuration information from the administration server.
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