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[Maithem <1257756@xxxxxxxxxxxxxxxxxx>]

This is not a Nova bug, stacking and unstacking is done using scripts from devstack. Anyways, you can solve this problem by killing the n-api and n-cpu process. You can do something like this:
ps aux | grep "nova", then kill the nova-api and nova-compute processes. I believe this problem happens when you have multiple workers for nova-api. 

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1257756

Title:
  multiple services running causes failure

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  Scenario : when stack.sh(from devstack) script is run for the first
  time and if for any reason the user unstack the openstack by using
  unstack.sh and clean.sh. And then again install it

  Issue : during 2nd run of stack.sh , few nova services specially n-cpu
  and n-api fails running. It happens because of unstacking the last
  stack these services was not killed.

  During 2nd run, the log file says : multiple services running on the same address (same URI).
  there would be multiple duplicate services runs which causes current install fails.

  the above message can be view. on running the services
  for example. just run nova-api on terminal

  Traceback : it will show address already in use. ERROR

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