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I am trying to install devstack on my fresh centos7 machine. All went well.
But i am not able to get service devstack at n-cpu.service up. following is the output of systemctl  status devstack at n-cpu.service 


>  sudo systemctl status devstack at n-cpu.service
> ● devstack at n-cpu.service - Devstack devstack at n-cpu.service
>  Loaded: loaded (/etc/systemd/system/devstack at n-cpu.service; enabled; vendor preset: disabled)
>  Active: failed (Result: exit-code) since Wed 2018-03-21 15:22:55 EDT; 10h left
>  Process: 4252 ExecStart=/usr/bin/nova-compute --config-file /etc/nova/nova-cpu.conf (code=exited, status=1/FAILURE)
>  Main PID: 4252 (code=exited, status=1/FAILURE)
> 
> Mar 21 15:22:55 localhost.localdomain nova-compute[4252]: ERROR nova from paramiko.auth_handler import AuthHandler
> Mar 21 15:22:55 localhost.localdomain nova-compute[4252]: ERROR nova File "/usr/lib/python2.7/site-packages/paramiko/auth_handler.py", lin...module>
> Mar 21 15:22:55 localhost.localdomain nova-compute[4252]: ERROR nova from paramiko.ssh_gss import GSSAuth, GSS_EXCEPTIONS
> Mar 21 15:22:55 localhost.localdomain nova-compute[4252]: ERROR nova File "/usr/lib/python2.7/site-packages/paramiko/ssh_gss.py", line 54,...module>
> Mar 21 15:22:55 localhost.localdomain nova-compute[4252]: ERROR nova GSS_EXCEPTIONS = (gssapi.GSSException,)
> Mar 21 15:22:55 localhost.localdomain nova-compute[4252]: ERROR nova AttributeError: 'module' object has no attribute 'GSSException'
> Mar 21 15:22:55 localhost.localdomain nova-compute[4252]: ERROR nova 
> Mar 21 15:22:55 localhost.localdomain systemd[1]: devstack at n-cpu.service: main process exited, code=exited, status=1/FAILURE
> Mar 21 15:22:55 localhost.localdomain systemd[1]: Unit devstack at n-cpu.service entered failed state.
> Mar 21 15:22:55 localhost.localdomain systemd[1]: devstack at n-cpu.service failed.
> Hint: Some lines were ellipsized, use -l to show in full. 
> 
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