Ubuntu: Could not able start the instance which in “error” state


Could not able to start the instance, getting following error.

$ nova reboot <instance-name>  ERROR: Cannot 'reboot' instance e54b5d26-2918-4ab6-8210-94e827bf2a94 while it is in vm_state error (HTTP 409) (Request-ID: req-88efe1d4-37c3-409e-89a9-844f537e51eb)  

$nova show <instance-name>  | fault                                | {"message": "Instance e54b5d26-2918-4ab6-8210-94e827bf2a94 cannot be rescued: Driver Error: internal error: early end of file from monitor: possible problem: |  |                                      | 2016-05-01T05:35:27.071764Z qemu-system-x86_64: cannot set up guest memory 'pc.ram': Cannot allocate memory   

Please tell me how to resolve this issue.


nova reboot --hard Instance_Name  

worked for me.

After I typed this command, I received

Request to reboot Server ( Server:Instance_Name) has been accepted.   

My instance started running back then.

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