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Load Balanced services consuming other load balanced services
At a minimum, because the two servers are on the same network segment, you'd necessarily want to use a SNAT. You could create a separate VIP on the app VLAN that the servers use to load balance amongst themselves. Two questions then come to mind:
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Do you need any kind of persistence across these services? For example, if the client is load balanced to server A, does server A have to persist to itself across the inner VIP? Or is basic load balancing okay?
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Are the two services running on the tomcat server completely independent of one another? Such that if the web server dies the web service may still be usable? Or would it be reasonable to a) take the server out of rotation if either service failed, and b) simply have the tomcat server talk to itself for web service requests, without going through a VIP.
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