Create an in-process node which inherits current stderr/stdout/stdin/PGId (process group id) and blocks until killed.
There can be only one node running at a time on a given machine.
see global options
Upon creation, nodes populate a lockfile at
containing their PId (process id).
Prior to node creation, if a lockfile exists, the existing lock holder will be liveness tested.
Only in the event the existing lock holder is dead will creation of a new node occur.