| Component Name | Description |
| Domain | The basic administrative unit for a WebLogic Server installation is called a domain. It’s a logically related group of WebLogic Server resources that we manage as a unit |
| Admin server | An Admin server is the central point of contact & control for domain responsible for configuration and monitoring of an entire domain. |
| Managed Server | A single server that boots on remote machine or perhaps on the same physical machine and loads it’s configuration from a specified Admin Server and all they need to know is domain and server they represent in a domain. |
| Cluster | Group of WLS servers managed by single Admin server. A cluster can exist on one or more computers. It appears as a single instance to clients whether those clients are web based or Java based. Using clustering we can achieve High availability & scalability by replicating services so that when one server fails a second server can take over & resume operation where first left off. Scalability is achieved through balancing the load of incoming requests across the servers in the cluster |
| config.xml | Admin Server maintains the complete configuration of the domain e.g. servers in the domain, cluster & deployed application in a persistent file repository called config.xml |
| Console | The Administration Console is a Java Server Pages (till WLS 8.1) or portal (WLS 9 onwards) based tool hosted by the Administration Server. You can access the Administration Console using a Web browser from any machine on the local network that can communicate with the Administration Server. The Administration Console allows you to manage a WebLogic Server domain. The management capabilities include: Configuration, Stopping and starting servers, Monitoring server health and performance, Monitoring application performance, Viewing server logs, Editing deployment descriptors for Web Applications, EJBs, J2EE Connectors, and Enterprise Applications. |
| Log files | Activities of WebLogic server and its components are recorded in log files. This can be categorized as domain logs, server logs and Admin logs. Domain logs have information on activities performed on entire domain. Server logs are specific to servers, each managed server will have a server logs and contains happenings of server. Admin logs have details on administration task performed from admin server. Domain logs and admin logs are present in admin server, whereas server logs of individual servers are present in each managed server.
Along with this, standard error and output file will also be generated when WebLogic server is started. This will be available in each managed and admin servers. More often these files help in understanding WLS issue.
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