I have juno multinode setup with 1 controller, 2 compute and a network node. While trying to migrate a VM from one compute instance to another the VM instance goes to error state with a SSH error "

{"message": "Unexpected error while running command.                                                   |

|                                      | Command: ssh 10.x.x.x mkdir -p /var/lib/nova/instances/c97c5b3d-fb91-4e7f-

8981-61d1743a0edb        |

|                                      | Exit code: 1                                                                                           |

|                                      | Stdout: u'This account is currently not available.\                                                    |

|                                      | '                                                                                                      |

|                                      | Stderr: u'******************************************", "code": 500, "created": 
"2014-11-21T17:42:54Z"}

I searched for a fix and one of the options was to change nova user shell from /sbin/nologin to /bin/bash.

What do we mean by changing nova user shell and how and where to do it? Also is this a valid option to fix this problem?