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Roll-back using virtualization

  • Create a new default zone/virtual machine.
  • Install the new version of the service.
  • Copy data from the currently running service.
  • Test that it works.
  • Test integration
    • DNS
    • Firewall
    • Communication with collaborating services and systems
  • Switch from the old version to the new version using Dynamic addressing with service names
  • Migrate changes from your last copy and up until the actual switch.

Some steps related to data migration can be simplified/omitted if the persistence technology is chosen wisely. E.g. easier with repositories based on Java spaces or distributed hashmaps than when based on RDBSs.