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Importing a new version from external source
Processes created inside container are assigned with pair of PIDs: one is traditional PID, i.e. a global value which uniquely identifies the process in host OS. Another is virtual PID which is unique only inside container but can be used by several containers. Processes inside container communicate using only their virtual PIDs, so that provided virtual PIDs are preserved while checkpointing/restore the whole container can be transferred to another hardware node not causing PID conflicts. Migrated processes get another global PIDs but this PID is invisible from inside container.
