Hello,
If I have understood your query, then I suppose you are trying to setup a cluster and front it with linux's LVS for load balancing. You can achieve that by creating a cluster within a single domain and add your instances to be part of this cluster - the target. These instances, would then share the same jks system and you need to obtain the certificate related to this target. The certificate associated with the http-service ssl listeners would be the same across all the instances of the cluster.
regards
Pankaj
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