WebSphere WebSphere Application Server Network Deployment, Version 6.0.x Operating Systems: AIX, HP-UX, Linux, Solaris, Windows

Dynamic reloading of configuration files

With dynamic reloading of configuration files, any updates to the configuration information are dynamically passed to the server, and therefore made available to messaging engines whether or not they are started.

The information that defines the configuration of service integration buses and their resources is saved in a set of configuration files. When a server starts up, it uses the current information about service integration read from those configuration files. When a messaging engine is started, it uses the information in the server that it is running in.

If the information in the configuration files is changed while the server is running, the server must either be dynamically updated or restarted to use the updated information.

With dynamic reloading of configuration files, any updates to the configuration information are dynamically passed to the server, and therefore made available to messaging engines whether or not they are started. You can enable dynamic reloading of configuration files for servers and for service integration buses.

If you choose not to enable dynamic reloading of configuration files, you need to restart the server to pick up any changes to the configuration files.

In a cluster deployment with failover, it is likely that the configuration information is updated between the initialization and start up of a messaging engine. (A messaging engine is initialized when the server starts, but may not get started for a long time after that). Therefore you should enable dynamic reloading of configuration files in a cluster deployment with failover, because restarting a server to pick up configuration changes causes a failover. To get predictable behavior on failover, you would have to ensure that the standby (inactive) servers had been updated and recycled before the active server.

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Last updated: 5 Oct 2005
http://publib.boulder.ibm.com/infocenter/ws60help/index.jsp?topic=/com.ibm.websphere.pmc.nd.doc\concepts\cji0004_.html

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