Public bug reported:
In normal operation, when the DHCP agent checks the namespace interfaces
used by the DHCP process, if this interface does not exist, an exception
is written in the log.
Because not having this interface is something that can usually happen
in normal operation, we should avoid raising and writing this exception.
LOG EXAMPLE:
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: DEBUG oslo.privsep.daemon [-] privsep: Exception
during request[139719361762872]: Network interface tap88ffe0d6-f0 not found in
namespace qdhcp-da607b3b-d956-4468-837f-ffbfbc69d852. {{(pid=21921)
_process_cmd /usr/local/lib/python3.6/dist-packages/oslo_privsep/daemon.py:454}}
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: Traceback (most recent call last):
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: File
"/opt/stack/old/neutron/neutron/privileged/agent/linux/ip_lib.py", line 246, in
get_link_id
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: return ip.link_lookup(ifname=device)[0]
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: IndexError: list index out of range
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: During handling of the above exception, another
exception occurred:
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: Traceback (most recent call last):
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: File
"/usr/local/lib/python3.6/dist-packages/oslo_privsep/daemon.py", line 449, in
_process_cmd
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: ret = func(*f_args, **f_kwargs)
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: File
"/opt/stack/old/neutron/neutron/privileged/agent/linux/ip_lib.py", line 53, in
sync_inner
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: return input_func(*args, **kwargs)
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: File
"/usr/local/lib/python3.6/dist-packages/oslo_privsep/priv_context.py", line
247, in _wrap
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: return func(*args, **kwargs)
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: File
"/opt/stack/old/neutron/neutron/privileged/agent/linux/ip_lib.py", line 406, in
get_link_attributes
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: link = _run_iproute_link("get", device,
namespace)[0]
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: File
"/opt/stack/old/neutron/neutron/privileged/agent/linux/ip_lib.py", line 254, in
_run_iproute_link
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: idx = get_link_id(device, namespace)
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: File
"/opt/stack/old/neutron/neutron/privileged/agent/linux/ip_lib.py", line 248, in
get_link_id
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: raise NetworkInterfaceNotFound(device=device,
namespace=namespace)
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]:
neutron.privileged.agent.linux.ip_lib.NetworkInterfaceNotFound: Network
interface tap88ffe0d6-f0 not found in namespace
qdhcp-da607b3b-d956-4468-837f-ffbfbc69d852.
** Affects: neutron
Importance: Undecided
Assignee: Rodolfo Alonso (rodolfo-alonso-hernandez)
Status: New
** Changed in: neutron
Assignee: (unassigned) => Rodolfo Alonso (rodolfo-alonso-hernandez)
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https://bugs.launchpad.net/bugs/1854723
Title:
Avoid NetworkInterfaceNotFound exception in DHCP agent logs
Status in neutron:
New
Bug description:
In normal operation, when the DHCP agent checks the namespace
interfaces used by the DHCP process, if this interface does not exist,
an exception is written in the log.
Because not having this interface is something that can usually happen
in normal operation, we should avoid raising and writing this
exception.
LOG EXAMPLE:
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: DEBUG oslo.privsep.daemon [-] privsep: Exception
during request[139719361762872]: Network interface tap88ffe0d6-f0 not found in
namespace qdhcp-da607b3b-d956-4468-837f-ffbfbc69d852. {{(pid=21921)
_process_cmd /usr/local/lib/python3.6/dist-packages/oslo_privsep/daemon.py:454}}
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: Traceback (most recent call last):
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: File
"/opt/stack/old/neutron/neutron/privileged/agent/linux/ip_lib.py", line 246, in
get_link_id
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: return ip.link_lookup(ifname=device)[0]
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: IndexError: list index out of range
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: During handling of the above exception, another
exception occurred:
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: Traceback (most recent call last):
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: File
"/usr/local/lib/python3.6/dist-packages/oslo_privsep/daemon.py", line 449, in
_process_cmd
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: ret = func(*f_args, **f_kwargs)
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: File
"/opt/stack/old/neutron/neutron/privileged/agent/linux/ip_lib.py", line 53, in
sync_inner
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: return input_func(*args, **kwargs)
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: File
"/usr/local/lib/python3.6/dist-packages/oslo_privsep/priv_context.py", line
247, in _wrap
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: return func(*args, **kwargs)
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: File
"/opt/stack/old/neutron/neutron/privileged/agent/linux/ip_lib.py", line 406, in
get_link_attributes
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: link = _run_iproute_link("get", device,
namespace)[0]
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: File
"/opt/stack/old/neutron/neutron/privileged/agent/linux/ip_lib.py", line 254, in
_run_iproute_link
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: idx = get_link_id(device, namespace)
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: File
"/opt/stack/old/neutron/neutron/privileged/agent/linux/ip_lib.py", line 248, in
get_link_id
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]: raise NetworkInterfaceNotFound(device=device,
namespace=namespace)
Dec 01 23:47:07.061850 ubuntu-bionic-ovh-bhs1-0013157001
neutron-dhcp-agent[20147]:
neutron.privileged.agent.linux.ip_lib.NetworkInterfaceNotFound: Network
interface tap88ffe0d6-f0 not found in namespace
qdhcp-da607b3b-d956-4468-837f-ffbfbc69d852.
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