Private bug reported:
We have VMs running GRE tunnels between them with OVSFW and SG
implemented along with GRE conntrack helper loaded on the hypervisor.
GRE works as expected but the tunnel breaks whenever there is a
neutron ovs agent event causing some exception like the below AMQP
timeouts or OVSFW port not found :
AMQP Timeout:
2017-04-07 19:07:03.001 5275 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
MessagingTimeout: Timed out waiting for a reply to message ID
4035644808d24ce9aae65a6ee567021c
2017-04-07 19:07:03.001 5275 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
2017-04-07 19:07:03.003 5275 WARNING oslo.service.loopingcall [-]
Function
'neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent.OVSNeutronAgent._report_state'
run outlasted interval by 120.01 sec
2017-04-07 19:07:03.041 5275 INFO
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [-]
Agent has just been revived. Doing a full sync.
2017-04-07 19:07:06.747 5275 INFO
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
[req-521c07b4-f53d-4665-b728-fc5f00191294 - - - - -] rpc_loop doing a
full sync.
2017-04-07 19:07:06.841 5275 INFO
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
[req-521c07b4-f53d-4665-b728-fc5f00191294 - - - - -] Agent out of sync
with plugin!
OVSFWPortNOtFound:
2017-03-30 18:31:05.048 5160 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
self.firewall.prepare_port_filter(device)
2017-03-30 18:31:05.048 5160 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/openstack/venvs/neutron-14.0.5/lib/python2.7/site-packages/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 272, in prepare_port_filter
2017-03-30 18:31:05.048 5160 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
of_port = self.get_or_create_ofport(port)
2017-03-30 18:31:05.048 5160 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/openstack/venvs/neutron-14.0.5/lib/python2.7/site-packages/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 246, in get_or_create_ofport
2017-03-30 18:31:05.048 5160 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent raise
OVSFWPortNotFound(port_id=port_id)
2017-03-30 18:31:05.048 5160 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
OVSFWPortNotFound: Port 01f7c714-1828-4768-9810-a0ec25dd2b92 is not
managed by this agent.
2017-03-30 18:31:05.048 5160 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
2017-03-30 18:31:05.072 5160 INFO
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
[req-db74f32b-5370-4a5f-86bf-935eba1490d0 - - - - -] Agent out of sync
with plugin!
The agent throws out of sync messages and starts to initialize neutron
ports once again along with fresh SG rules.
2017-04-07 19:07:07.110 5275 INFO neutron.agent.securitygroups_rpc
[req-521c07b4-f53d-4665-b728-fc5f00191294 - - - - -] Preparing filters
for devices set([u'4b14619f-3b9e-4103-b9d7-9c7e52c797d8'])
2017-04-07 19:07:07.215 5275 ERROR
neutron.agent.linux.openvswitch_firewall.firewall
[req-521c07b4-f53d-4665-b728-fc5f00191294 - - - - -] Initializing port
4b14619f-3b9e-4103-b9d7-9c7e52c797d8 that was already initialized.
During this process, when it prepares new filters for all ports, its
marking the conntrack entry for certain GRE connection(high traffic)
as invalid.
root@server:/var/log# conntrack -L -o extended -p gre -f ipv4
ipv4 2 gre 47 178 src=1.1.1.203 dst=2.2.2.66 srckey=0x0 dstkey=0x0
src=2.2.2.66 dst=1.1.1.203 srckey=0x0 dstkey=0x0 [ASSURED] mark=1
zone=5 use=1
ipv4 2 gre 47 179 src=5.5.5.104 dst=4.4.4.187 srckey=0x0 dstkey=0x0
src=4.4.4.187 dst=5.5.5.104 srckey=0x0 dstkey=0x0 [ASSURED] mark=0
zone=5 use=1
And that connection state remains invalid, unless someone reboots the
VM, or flushes the connection directly on the conntrack or through
OVS.
We have a blanket any protocol any port any IP SG rule during this
scenario, we even tried adding specific rules to allow IP 47 for GRE.
But nothing fixed this problem.
Was checking for ovs-conntrack helper specific bugs and came across
patchwork.ozlabs.org/patch/755615/ - is this bug being
triggered in the above scenario ? Is this a bug in the ovs-fw code or
this something on the ovs-conntrack implementation.
OpenStack Version : Newton.
Hypervisor OS : Ubuntu 16.04.2
Kernel version : 4.4.0-70-generic
OVS version : 2.6.1
please see: https://lists.gt.net/openstack/dev/62980 (original email from Aju
Francis reporting this issue)
** Affects: null-and-void
Importance: Undecided
Status: Invalid
** Tags: ovs-fw sg-fw
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https://bugs.launchpad.net/bugs/1709102
Title:
ovs-fw does not reinstate GRE conntrack entry
Status in NULL Project:
Invalid
Bug description:
We have VMs running GRE tunnels between them with OVSFW and SG
implemented along with GRE conntrack helper loaded on the hypervisor.
GRE works as expected but the tunnel breaks whenever there is a
neutron ovs agent event causing some exception like the below AMQP
timeouts or OVSFW port not found :
AMQP Timeout:
2017-04-07 19:07:03.001 5275 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
MessagingTimeout: Timed out waiting for a reply to message ID
4035644808d24ce9aae65a6ee567021c
2017-04-07 19:07:03.001 5275 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
2017-04-07 19:07:03.003 5275 WARNING oslo.service.loopingcall [-]
Function
'neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent.OVSNeutronAgent._report_state'
run outlasted interval by 120.01 sec
2017-04-07 19:07:03.041 5275 INFO
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [-]
Agent has just been revived. Doing a full sync.
2017-04-07 19:07:06.747 5275 INFO
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
[req-521c07b4-f53d-4665-b728-fc5f00191294 - - - - -] rpc_loop doing a
full sync.
2017-04-07 19:07:06.841 5275 INFO
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
[req-521c07b4-f53d-4665-b728-fc5f00191294 - - - - -] Agent out of sync
with plugin!
OVSFWPortNOtFound:
2017-03-30 18:31:05.048 5160 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
self.firewall.prepare_port_filter(device)
2017-03-30 18:31:05.048 5160 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/openstack/venvs/neutron-14.0.5/lib/python2.7/site-packages/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 272, in prepare_port_filter
2017-03-30 18:31:05.048 5160 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
of_port = self.get_or_create_ofport(port)
2017-03-30 18:31:05.048 5160 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/openstack/venvs/neutron-14.0.5/lib/python2.7/site-packages/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 246, in get_or_create_ofport
2017-03-30 18:31:05.048 5160 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent raise
OVSFWPortNotFound(port_id=port_id)
2017-03-30 18:31:05.048 5160 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
OVSFWPortNotFound: Port 01f7c714-1828-4768-9810-a0ec25dd2b92 is not
managed by this agent.
2017-03-30 18:31:05.048 5160 ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
2017-03-30 18:31:05.072 5160 INFO
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
[req-db74f32b-5370-4a5f-86bf-935eba1490d0 - - - - -] Agent out of sync
with plugin!
The agent throws out of sync messages and starts to initialize neutron
ports once again along with fresh SG rules.
2017-04-07 19:07:07.110 5275 INFO neutron.agent.securitygroups_rpc
[req-521c07b4-f53d-4665-b728-fc5f00191294 - - - - -] Preparing filters
for devices set([u'4b14619f-3b9e-4103-b9d7-9c7e52c797d8'])
2017-04-07 19:07:07.215 5275 ERROR
neutron.agent.linux.openvswitch_firewall.firewall
[req-521c07b4-f53d-4665-b728-fc5f00191294 - - - - -] Initializing port
4b14619f-3b9e-4103-b9d7-9c7e52c797d8 that was already initialized.
During this process, when it prepares new filters for all ports, its
marking the conntrack entry for certain GRE connection(high traffic)
as invalid.
root@server:/var/log# conntrack -L -o extended -p gre -f ipv4
ipv4 2 gre 47 178 src=1.1.1.203 dst=2.2.2.66 srckey=0x0 dstkey=0x0
src=2.2.2.66 dst=1.1.1.203 srckey=0x0 dstkey=0x0 [ASSURED] mark=1
zone=5 use=1
ipv4 2 gre 47 179 src=5.5.5.104 dst=4.4.4.187 srckey=0x0 dstkey=0x0
src=4.4.4.187 dst=5.5.5.104 srckey=0x0 dstkey=0x0 [ASSURED] mark=0
zone=5 use=1
And that connection state remains invalid, unless someone reboots the
VM, or flushes the connection directly on the conntrack or through
OVS.
We have a blanket any protocol any port any IP SG rule during this
scenario, we even tried adding specific rules to allow IP 47 for GRE.
But nothing fixed this problem.
Was checking for ovs-conntrack helper specific bugs and came across
patchwork.ozlabs.org/patch/755615/ - is this bug being
triggered in the above scenario ? Is this a bug in the ovs-fw code or
this something on the ovs-conntrack implementation.
OpenStack Version : Newton.
Hypervisor OS : Ubuntu 16.04.2
Kernel version : 4.4.0-70-generic
OVS version : 2.6.1
please see: https://lists.gt.net/openstack/dev/62980 (original email from Aju
Francis reporting this issue)
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