aix6.2的虚机系统，powerVC创建虚机时利用cloud-init来配置ip，其中偶发配置失败，cloud-init日志如下：
3647 2017-10-20 10:49:15,254 - DataSourceConfigDrive.py[DEBUG]: Updating network interfaces from config drive
3648 2017-10-20 10:49:15,254 - util.py[DEBUG]: Writing to /etc/resolv.conf - wb: [420] 0 bytes
3649 2017-10-20 10:49:15,269 - util.py[DEBUG]: Running command ['/usr/sbin/chrctcp', '-S', '-d', 'dhcpcd'] with allowed return codes [0] (shell=False, capture=False)
3650 0513-044 The dhcpcd Subsystem was requested to stop.
3651 2017-10-20 10:49:15,323 - util.py[DEBUG]: Running command ['/usr/sbin/chrctcp', '-S', '-d', 'ndpd-host'] with allowed return codes [0] (shell=False, capture=False)
3652 0513-004 The Subsystem or Group, ndpd-host, is currently inoperative.
3653 2017-10-20 10:49:15,362 - util.py[DEBUG]: Running command ['/usr/sbin/chrctcp', '-d', 'autoconf6'] with allowed return codes [0] (shell=False, capture=False)
3654 2017-10-20 10:49:15,391 - util.py[DEBUG]: Running hidden command to protect sensitive input/output logstring: ['/usr/sbin/chdev', '-l', 'en0', '-anetmask=255.255.255.0', '-anet addr=172.31.5.43']
3655 2017-10-20 10:49:15,465 - util.py[WARNING]: Getting data from <class 'cloudinit.sources.DataSourceConfigDrive.DataSourceConfigDrive'> failed
3656 2017-10-20 10:49:15,466 - util.py[DEBUG]: Getting data from <class 'cloudinit.sources.DataSourceConfigDrive.DataSourceConfigDrive'> failed
3657 Traceback (most recent call last):
3658 File "/opt/freeware/lib/python2.7/site-packages/cloudinit/sources/__init__.py", line 256, in find_source
3659 if s.get_data():
3660 File "/opt/freeware/lib/python2.7/site-packages/cloudinit/sources/DataSourceConfigDrive.py", line 110, in get_data
3661 on_first_boot(results, distro=self.distro)
3662 File "/opt/freeware/lib/python2.7/site-packages/cloudinit/sources/DataSourceConfigDrive.py", line 197, in on_first_boot
3663 distro.apply_network(net_conf)
3664 File "/opt/freeware/lib/python2.7/site-packages/cloudinit/distros/aix.py", line 50, in apply_network
3665 dev_names = self._write_network(settings)
3666 File "/opt/freeware/lib/python2.7/site-packages/cloudinit/distros/aix.py", line 120, in _write_network
3667 raise e
3668 ProcessExecutionError: Unexpected error while running command.
3669 Command: ['/usr/sbin/chdev', '-l', 'en0', '-anetmask=255.255.255.0', '-anetaddr=172.31.5.43']
3670 Exit code: 1
3671 Reason: -
3672 Stdout: ''
3673 Stderr: 'Method error (/usr/lib/methods/chgif):\n\t0514-068 Cause not known.\n0821-510 ifconfig: error calling entry point for /usr/lib/drivers/if_en: Do not specify an existin g file.\n0821-103 : The command /usr/sbin/ifconfig en0 inet 172.31.5.43 arp netmask 255.255.255.0 mtu 1500 down -largesend -monitor -thread failed.\n0821-229 chgif: ifconfig command failed.\nThe status of"en0" Interface in the current running system is uncertain.\n\n'
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