  Live migration of services is a prerequisite for various use cases that must
be fulfilled for the realization of Industry 4.0. In addition, many different
types of services need to provide mobility and consequently need to be migrated
live. These can be offloaded algorithms from mobile devices, such as unmanned
vehicles or robots, security services, communication services or classic
control tasks. In particular, the latter place very high demands on determinism
and latency. Here, it is of utmost importance that the downtime of the service
is as low as possible. Since existing live migration approaches try to optimize
multiple metrics such as downtime, migration time as well as energy
consumption, which are equally relevant in the IT domain, it is not possible to
use any of these approaches without adoptions.
  Therefore, a novel concept is proposed that builds on top of both existing
migration approaches as well as virtualization technologies and aims primarily
at minimizing service downtime. Furthermore, the concept is evaluated using a
test environment. The results show that a sub-millisecond downtime can be
achieved with the proposed concept. Moreover, the total migration time is in
the range of several hundred milliseconds for the highest performance setting
and two seconds for a non-invasive approach.
