Zero Downtime Patching enables a convenient method of updating production applications on WebLogic Server without incurring any application downtime or loss of session data for your end-users. This new feature may be especially useful for users who want to update multiple applications at the same time, or for those who cannot take advantage of the Production Redeployment feature due to various limitations or restrictions. Now there is a convenient alternative to complex application patching methods.
This rollout is based on the process and mechanism for automating rollouts across a domain while allowing applications to continue to service requests. In addition to the reliable automation, the Zero Downtime Patching feature also combines Oracle Traffic Director (OTD) load balancer and WebLogic Server to provide some advanced techniques for preserving active sessions and even handling incompatible session state during the patching process.
To rollout an application update, follow these 3 simple steps.
1. Produce a copy of the updated the application(s), test and verify. Note the administrator is responsible for making sure that the updated application sources are distributed to the appropriate nodes. For stage mode, the updated application source needs to be available on the file system for the AdminServer to distribute the application source. For no stage and external stage mode, the updated application source needs to be available on the file system for each node.
2. Create a JSON formatted file with the details of any applications that need to be updated during the rollout. Read the complete article here.
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