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[Brian Haley <1818566@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1618878 ***
    https://bugs.launchpad.net/bugs/1618878

** This bug has been marked a duplicate of bug 1618878
   Disabling IPv6 on an interface fails if IPv6 is completely disabled in the kernel

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https://bugs.launchpad.net/bugs/1818566

Title:
  If ipv6 is disabled through the kernel, neutron-dhcp-agent fails to
  create the tap devices due to error regarding ipv6

Status in neutron:
  New

Bug description:
  If we disable ipv6 using ipv6.disable=1 at the kernel runtime,
  neutron-dhcp-agent stops creating the tap devices and fails here:

  
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.linux.utils [-] Exit code: 255; Stdin: ; Stdout: ; Stderr: sysctl: cannot stat /proc/sys/net/ipv6/conf/default/accept_ra: No such file or directory
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent [-] Unable to enable dhcp for 310b9752-06a5-4d7b-98ae-1ba8536e22fa.
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent Traceback (most recent call last):
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python2.7/site-packages/neutron/agent/dhcp/agent.py", line 140, in call_driver
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent     getattr(driver, action)(**action_kwargs)
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python2.7/site-packages/neutron/agent/linux/dhcp.py", line 213, in enable
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent     interface_name = self.device_manager.setup(self.network)
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python2.7/site-packages/neutron/agent/linux/dhcp.py", line 1441, in setup
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent     n_const.ACCEPT_RA_DISABLED)
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python2.7/site-packages/neutron/agent/linux/interface.py", line 260, in configure_ipv6_ra
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent     'value': value}])
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python2.7/site-packages/neutron/agent/linux/ip_lib.py", line 912, in execute
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent     log_fail_as_error=log_fail_as_error, **kwargs)
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py", line 148, in execute
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent     raise ProcessExecutionError(msg, returncode=returncode)
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent ProcessExecutionError: Exit code: 255; Stdin: ; Stdout: ; Stderr: sysctl: cannot stat /proc/sys/net/ipv6/conf/default/accept_ra: No such file or directory
  dhcp-agent.log:2019-03-04 19:29:13.342 5869 ERROR neutron.agent.dhcp.agent

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