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OpenStack icehouse installation error : nova-api service getting stopped

While trying to install OpenStack icehouse, faced an issue with nova-api service.It was not getting started. The following error was coming up in the Nova-api log

Command: sudo nova-rootwrap /etc/nova/rootwrap.conf iptables-save -c
Exit code: 1
.......
 nova Stdout: ''
2014-10-17 07:21:08.058 27270 TRACE nova Stderr: 'Traceback (most recent call last):\n  File "/usr/bin/nova-rootwrap", line 6, in <module>\n    from oslo.rootwrap.cmd import main\nImportError: No module named rootwrap.cmd\n'

Problem was with one of the oslo.rootwrap module. It was broken

Solution is to upgrade the module using pip

 #pip install oslo.rootwrap --upgrade
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