dhcp agent create broken network namespace

[Alex Xu]

Running dhcp agent, get error as below:

2014-07-10 23:18:41.932 ERROR neutron.agent.dhcp_agent [-] Unable to enable dhcp for 72cad723-3ce1-402b-ac4b-746274cbad9d.
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent Traceback (most recent call last):
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent File "/opt/stack/neutron/neutron/agent/dhcp_agent.py", line 129, in call_driver
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent getattr(driver, action)(**action_kwargs)
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 191, in enable
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent interface_name = self.device_manager.setup(self.network)
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 894, in setup
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent namespace=network.namespace)
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent File "/opt/stack/neutron/neutron/agent/linux/interface.py", line 368, in plug
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent namespace2=namespace)
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 125, in add_veth
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent self.ensure_namespace(namespace2)
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 137, in ensure_namespace
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent lo.link.set_up()
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 248, in set_up
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent self._as_root('set', self.name, 'up')
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 229, in _as_root
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent kwargs.get('use_root_namespace', False))
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 69, in _as_root
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent namespace)
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 80, in _execute
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent root_helper=root_helper)
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent File "/opt/stack/neutron/neutron/agent/linux/utils.py", line 76, in execute
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent raise RuntimeError(m)
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent RuntimeError:
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent Command: ['sudo', '/usr/local/bin/neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'ip', 'netns', 'exec', 'qdhcp-72cad723-3ce1-402b-ac4b-746274cbad9d', 'ip', 'link', 'set', 'lo', 'up']
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent Exit code: 1
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent Stdout: ''
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent Stderr: 'seting the network namespace "qdhcp-72cad723-3ce1-402b-ac4b-746274cbad9d" failed: Invalid argument\n'
2014-07-10 23:18:41.932 TRACE neutron.agent.dhcp_agent

[Alex Xu (xuhj)]

After I reboot my ubuntu14.04, I execute:
'ip netns add testns'
'ip netns exec testns ifconfig'

This works.

But If I execute:
sudo /usr/local/bin/neutron-rootwrap /etc/neutron/rootwrap.conf ip netns add testns
sudo ip netns exec testns ifconfig

Then I got same error as above.

[Alex Xu (xuhj)]

Just reboot my ubuntu 14.04, then I execute
'ip netns add testns'
'ip netns exec testns ifconfig'

It failed ....

[Eugene Nikanorov (enikanorov)]

Please be more specific about what errors you are getting.
'ip netns exec' should work under root. It could be that somehow /var/run/netns/<namespace> has wrong permissions (it happens rarely) or you have some misconfiguration for neutron user. That could lead to the errors you see.

[Launchpad Janitor (janitor)]

[Expired for neutron because there has been no activity for 60 days.]