** Description changed:
+ [Impact]
+ Restarts of openvswitch (typically on upgrade) result in loss of tunnel
connectivity when the l2population driver is in use. This results in loss of
access to all instances on the effected compute hosts
+
+ [Test Case]
+ Deploy cloud with ml2/ovs/l2population enabled
+ boot instances
+ restart ovs; instance connectivity will be lost until the
neutron-openvswitch-agent is restarted on the compute hosts.
+
+ [Regression Potential]
+ Minimal - in multiple stable branches upstream.
+
+ [Original Bug Report]
On 2015-05-28, our Landscape auto-upgraded packages on two of our
OpenStack clouds. On both clouds, but only on some compute nodes, the
upgrade of openvswitch-switch and corresponding downtime of
ovs-vswitchd appears to have triggered some sort of race condition
within neutron-plugin-openvswitch-agent leaving it in a broken state;
any new instances come up with non-functional network but pre-existing
instances appear unaffected. Restarting n-p-ovs-agent on the affected
compute nodes is sufficient to work around the problem.
The packages Landscape upgraded (from /var/log/apt/history.log):
Start-Date: 2015-05-28 14:23:07
Upgrade: nova-compute-libvirt:amd64 (2014.1.4-0ubuntu2, 2014.1.4-0ubuntu2.1),
libsystemd-login0:amd64 (204-5ubuntu20.11, 204-5ubuntu20.12),
nova-compute-kvm:amd64 (2014.1.4-0ubuntu2, 2014.1.4-0ubuntu2.1),
systemd-services:amd64 (204-5ubuntu20.11, 204-5ubuntu20.12),
isc-dhcp-common:amd64 (4.2.4-7ubuntu12.1, 4.2.4-7ubuntu12.2), nova-common:amd64
(2014.1.4-0ubuntu2, 2014.1.4-0ubuntu2.1), python-nova:amd64 (2014.1.4-0ubuntu2,
2014.1.4-0ubuntu2.1), libsystemd-daemon0:amd64 (204-5ubuntu20.11,
204-5ubuntu20.12), grub-common:amd64 (2.02~beta2-9ubuntu1.1,
2.02~beta2-9ubuntu1.2), libpam-systemd:amd64 (204-5ubuntu20.11,
204-5ubuntu20.12), udev:amd64 (204-5ubuntu20.11, 204-5ubuntu20.12),
grub2-common:amd64 (2.02~beta2-9ubuntu1.1, 2.02~beta2-9ubuntu1.2),
openvswitch-switch:amd64 (2.0.2-0ubuntu0.14.04.1, 2.0.2-0ubuntu0.14.04.2),
libudev1:amd64 (204-5ubuntu20.11, 204-5ubuntu20.12), isc-dhcp-client:amd64
(4.2.4-7ubuntu12.1, 4.2.4-7ubuntu12.2), python-eventlet:amd64 (0.13.0-1ubuntu2,
0.13.0-1ubuntu
2.1), python-novaclient:amd64 (2.17.0-0ubuntu1.1, 2.17.0-0ubuntu1.2),
grub-pc-bin:amd64 (2.02~beta2-9ubuntu1.1, 2.02~beta2-9ubuntu1.2), grub-pc:amd64
(2.02~beta2-9ubuntu1.1, 2.02~beta2-9ubuntu1.2), nova-compute:amd64
(2014.1.4-0ubuntu2, 2014.1.4-0ubuntu2.1), openvswitch-common:amd64
(2.0.2-0ubuntu0.14.04.1, 2.0.2-0ubuntu0.14.04.2)
End-Date: 2015-05-28 14:24:47
From /var/log/neutron/openvswitch-agent.log:
2015-05-28 14:24:18.336 47866 ERROR neutron.agent.linux.ovsdb_monitor
[-] Error received from ovsdb monitor: ovsdb-client:
unix:/var/run/openvswitch/db.sock: receive failed (End of file)
Looking at a stuck instances, all the right tunnels and bridges and
what not appear to be there:
root@vector:~# ip l l | grep c-3b
- 460002: qbr7ed8b59c-3b: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
noqueue state UP mode DEFAULT group default
+ 460002: qbr7ed8b59c-3b: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
noqueue state UP mode DEFAULT group default
460003: qvo7ed8b59c-3b: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500
qdisc pfifo_fast master ovs-system state UP mode DEFAULT group default qlen 1000
460004: qvb7ed8b59c-3b: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500
qdisc pfifo_fast master qbr7ed8b59c-3b state UP mode DEFAULT group default qlen
1000
460005: tap7ed8b59c-3b: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
pfifo_fast master qbr7ed8b59c-3b state UNKNOWN mode DEFAULT group default qlen
500
root@vector:~# ovs-vsctl list-ports br-int | grep c-3b
qvo7ed8b59c-3b
- root@vector:~#
+ root@vector:~#
But I can't ping the unit from within the qrouter-${id} namespace on
the neutron gateway. If I tcpdump the {q,t}*c-3b interfaces, I don't
see any traffic.
** Changed in: neutron (Ubuntu Trusty)
Status: New => In Progress
** Changed in: neutron (Ubuntu Trusty)
Assignee: (unassigned) => James Page (james-page)
** Also affects: cloud-archive
Importance: Undecided
Status: New
** Also affects: cloud-archive/juno
Importance: Undecided
Status: New
** Also affects: cloud-archive/kilo
Importance: Undecided
Status: New
** Changed in: cloud-archive/kilo
Importance: Undecided => Medium
** Changed in: cloud-archive/juno
Importance: Undecided => Medium
** Changed in: neutron (Ubuntu Trusty)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1460164
Title:
restart of openvswitch-switch causes instance network down when
l2population enabled
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