In this video, we are going to look at Oracle Weblogic Admin Server and Managed Server.
For those who are new, Administration Server is a WebLogic Server instance that maintains configuration data for a domain and Managed Server is an instance of your WebLogic server that is running on JVM and has its own configuration. To know in detail about Weblogic Admin Server and Managed Server, go through the video below.
If you are a beginner and want to learn Oracle Weblogic Server Administration then check our blog post here, where we covered Weblogic Domain Home and Server.
What is an Admin Server:
- Admin server is the central point from where you can configure, Monitor and manage all resources of a domain.
- It is a WebLogic Server instance that maintains configuration data for a domain.
- We can deploy our application on administration Server but it is recommended to create managed Server and deploy your application in managed server and leave Administration domain for configuration and maintenance.
- There will always be at least one Administration Server in a domain.
- Admin Server is a Singleton Service.
What is a Managed Server:
- Managed Server is an instance of your WebLogic server that is running on JVM and has its own configuration.
- In a Managed server, we will deploy the java components i.e Web Applications, EJB Applications, JMS Applications and Web services.
- There will always be Zero to N Managed Server per domain.
- Managed Server is Independent of other servers unless they are in the cluster.
How Admin and Managed Server related to each other:
- An admin Server stores master configuration of the domain including Managed Servers configuration.
- Each Managed Server stores a local copy of the config.
- For only first time Managed Server startup, Admin Server should be running.
- On subsequent Managed Server startup, it connects to Admin Server to synchronize configuration.
- If Admin Server is not available at start-up, Managed Server boots with its local copy.
Can we start a Managed Server if the Administration Server is Unavailable:
By default, if a Managed Server is unable to connect to the specified Administration Server during startup, it can retrieve its configuration by reading a configuration file and other files directly. We cannot change the server’s configuration until the Administration Server is available. A Managed Server that starts in this way is running in Managed Server Independence Mode.
So this is all in nutshell about Oracle Weblogic Admin Server and Managed Server. Please go through the video to know in detail.
We cover this in one of the modules of our Oracle WebLogic Training, where we also cover Architecture, File System, JDBC, JMS, HA, Clustering, Security, Patching, Upgrade, Backup, and Recovery etc.
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What’s Next
- What are Clusters?
- What is a Dynamic Cluster?
Leave a comment if you know answers or if you want to know an answer to these questions (share which one) and If I see enough questions then I’ll cover about WebLogic Servers.
If you planning to Learn WebLogic Server or would like to check some of the common Oracle WebLogic Interview Questions then get them from down below.
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