** Changed in: neutron
Status: Fix Committed => Fix Released
** Changed in: neutron
Milestone: None => juno-3
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https://bugs.launchpad.net/bugs/1333134
Title:
wrong gateway_ip setting in subnet constantly resyncs dhcp-agent,
causing DHCP NAK dropping connection in guests
Status in OpenStack Neutron (virtual network service):
Fix Released
Status in OpenStack Security Advisories:
Won't Fix
Bug description:
If any tenant creates a subnet with a wrong gateway ip (outside the subnet
CIDR),
ip route will fail to set the route into the qdhcp namespace, and that
will cause constant resyncs and neutron-dhcp-agent malfunction.
This needs a fix either in parameter acceptance in API, or/and before calling
iproute
into the neutron-dhcp-agent to avoid this problem.
[root@controllerNN ~(keystone_admin)]# neutron subnet-create privnet2
192.168.126.0/24 --gateway 192.168.222.1 --name badsubnet
Created a new subnet:
+------------------+------------------------------------------------------+
| Field | Value |
+------------------+------------------------------------------------------+
| allocation_pools | {"start": "192.168.126.1", "end": "192.168.126.254"} |
| cidr | 192.168.126.0/24 |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 192.168.222.1 |
| host_routes | |
| id | 4f41041f-3035-43f1-9dbf-daa61a96fb7e |
| ip_version | 4 |
| name | badsubnet |
| network_id | 9ef49c17-6845-4e26-827c-bb2423317f67 |
| tenant_id | 60b2f5dcf34542f7952216beb97793a1 |
+------------------+------------------------------------------------------+
And this is the log of the dhcp server:
[root@controllerNN ~(keystone_admin)]# tail -f
/var/log/neutron/dhcp-agent.log
2014-06-22 08:41:08.107 3767 TRACE neutron.agent.dhcp_agent
root_helper=root_helper)
2014-06-22 08:41:08.107 3767 TRACE neutron.agent.dhcp_agent File
"/usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py", line 76, in
execute
2014-06-22 08:41:08.107 3767 TRACE neutron.agent.dhcp_agent raise
RuntimeError(m)
2014-06-22 08:41:08.107 3767 TRACE neutron.agent.dhcp_agent RuntimeError:
2014-06-22 08:41:08.107 3767 TRACE neutron.agent.dhcp_agent Command: ['sudo',
'neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'ip', 'netns', 'exec',
'qdhcp-9ef49c17-6845-4e26-827c-bb2423317f67', 'ip', 'route', 'replace',
'default', 'via', '192.168.222.1', 'dev', 'tap8ac47b9f-ea']
2014-06-22 08:41:08.107 3767 TRACE neutron.agent.dhcp_agent Exit code: 2
2014-06-22 08:41:08.107 3767 TRACE neutron.agent.dhcp_agent Stdout: ''
2014-06-22 08:41:08.107 3767 TRACE neutron.agent.dhcp_agent Stderr:
'RTNETLINK answers: Network is unreachable\n'
2014-06-22 08:41:08.107 3767 TRACE neutron.agent.dhcp_agent
2014-06-22 08:41:08.108 3767 INFO neutron.agent.dhcp_agent [-] Synchronizing
state complete
2014-06-22 08:41:38.109 3767 INFO neutron.agent.dhcp_agent [-] Synchronizing
state
2014-06-22 08:41:38.426 3767 ERROR neutron.agent.dhcp_agent [-] Unable to
enable dhcp for 9ef49c17-6845-4e26-827c-bb2423317f67.
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent Traceback (most
recent call last):
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent File
"/usr/lib/python2.7/site-packages/neutron/agent/dhcp_agent.py", line 127, in
call_driver
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent
getattr(driver, action)(**action_kwargs)
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent File
"/usr/lib/python2.7/site-packages/neutron/agent/linux/dhcp.py", line 166, in
enable
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent
reuse_existing=True)
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent File
"/usr/lib/python2.7/site-packages/neutron/agent/linux/dhcp.py", line 854, in
setup
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent
self._set_default_route(network, port)
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent File
"/usr/lib/python2.7/site-packages/neutron/agent/linux/dhcp.py", line 737, in
_set_default_route
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent
device.route.add_gateway(subnet.gateway_ip)
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent File
"/usr/lib/python2.7/site-packages/neutron/agent/linux/ip_lib.py", line 368, in
add_gateway
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent
self._as_root(*args)
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent File
"/usr/lib/python2.7/site-packages/neutron/agent/linux/ip_lib.py", line 217, in
_as_root
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent
kwargs.get('use_root_namespace', False))
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent File
"/usr/lib/python2.7/site-packages/neutron/agent/linux/ip_lib.py", line 70, in
_as_root
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent namespace)
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent File
"/usr/lib/python2.7/site-packages/neutron/agent/linux/ip_lib.py", line 81, in
_execute
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent
root_helper=root_helper)
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent File
"/usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py", line 76, in
execute
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent raise
RuntimeError(m)
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent RuntimeError:
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent Command: ['sudo',
'neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'ip', 'netns', 'exec',
'qdhcp-9ef49c17-6845-4e26-827c-bb2423317f67', 'ip', 'route', 'replace',
'default', 'via', '192.168.222.1', 'dev', 'tap8ac47b9f-ea']
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent Exit code: 2
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent Stdout: ''
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent Stderr:
'RTNETLINK answers: Network is unreachable\n'
2014-06-22 08:41:38.426 3767 TRACE neutron.agent.dhcp_agent
2014-06-22 08:41:38.427 3767 INFO neutron.agent.dhcp_agent [-] Synchronizing
state complete
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