Distributing nonce caching to servers in a cluster
Distributed nonce caching allows us to distribute the cache for a nonce to different servers in a cluster.
Before configuring distributed nonce caching, configure cache replication.
See configuring cache replication.
Important: When you configure the cache replication, do not use the default value of a single replica for the Number of replicas for dynamic cache replication domains. Instead, use a full group replica for any replication domains configured for dynamic cache. If we cannot select the option, verify the cache replication configuration.
In previous releases of WAS, the nonce was cached locally. To use this feature, complete the following actions:
- Verify created an appropriate domain setting when you form a cluster.
See creating clusters.
- Verify that replication domain is properly secured. The nonce cache is crucial to the integrity of the nonce validation process. If the nonce cache is compromised, then we cannot trust the result of the validation process.
- In the console for the cell level, set the Distribute nonce caching option by enabling the distributed cache option in the Security cache panel. We can enable the option by completing the following steps:
- Click Services > Security cache
- Click the check box to select the Enable distributed caching option.
- Verify that the dynamic cache service is enabled for each one of the application servers in the cluster. To access the dynamic cache service through the console...
- Click Servers > Server Types > WebSphere application servers > server.
- Under Container settings, click Container services > Dynamic cache service.
- Confirm that the Enable service at server startup option is selected.
- In the console for the server level, select the Distribute nonce caching option. We can enable the option by completing the following steps:
- Click Security > Web services.
- Select the Distribute nonce caching option.
- Restart the servers within the cluster.
Results
When you select the Distribute nonce caching option in the console, the nonce is propagated to other servers in the environment. However, the nonce might be subject to a one-second delay in propagation and subject to any network congestion.
What to do next
For more information on distributed nonce caching, see Web Services Security enhancements.
Related concepts
Nonce, a randomly generated token Web Services Security enhancements Distributed nonce cache
Security considerations for web services