*** This bug is a duplicate of bug 1618878 ***
https://bugs.launchpad.net/bugs/1618878
Public bug reported:
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
** Affects: neutron
Importance: Undecided
Status: New
** Description changed:
- I see the same behavior here though by setting that in
- /boot/grub/grub.cfg and rebooting. I lost all my taps. Investigating.
+ If we disable ipv6 using ipv6.disable=1 at the kernel runtime, neutron-
+ dhcp-agent stops creating the tap devices and fails here:
- BTW, I'm not sure totally disabling ipv6 from the kernel is the best
- method to disable ipv6 ... In this KCS[ [1] , we notify the customers
- that this might break SSH XFowarding. In this case, the taps are no
- longer created but according to this KCS [2], it should still be created
- with ipv4 links. That could be a bug. Perhaps open a BZ for this
- issue.
-
- It looks like the problem is 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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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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