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Docker 1.5.0+ introduces a --pid=host feature which allows sharing of PID namespaces between baremetal and containers. This is useful for atomic upgrades, atomic rollbacks, and monitoring. For more details of a real-life use case, check out: http://sdake.io/2015/01/28/an-atomic-upgrade-process-for-openstack-compute-nodes/ Signed-off-by: Steven Dake <stdake@cisco.com>