''Here be dragons'' is a phrase that comes to mind when putting yourself in the shoes of an enterprise fighting to bring its legacy software in the cloud. On the other hand, ''free as a bird'' is quite fitting for the startup building a fresh cloud native app.
Continuing to bring Java and OpenStack together, this look at OpenStack4j's Identity Service, version 3, should help give you better control over your services.
Your databases are deployed on an SSD-backed infrastructure for fast performance, and direct patches to Amazon EC2 ensure the lowest latency available.
When creating audit logs, consider using Spring Data. Its JPA functionality allows for EntityListeners and callback methods to update the needed properties.
ElasticSearch is an open-source, broadly distributable, readily scalable, enterprise-grade search engine. Look more closely into what it is, its advantages, and stats.
Replicating your data has obvious benefits, but can be a bit tedious to setup. Take a look at how to easily set it up using PostgreSQL and Jelastic's cloud.
Auditing provides valuable information, but it can be a nightmare to implement. Fortunately, through Spring Data JPA, you can persist the columns you need.
In-memory data grids are often used to enhance performance. Learn how to use Hazelcast for caching data stored in the MySQL database accessed by Spring Data DAO objects.