** Also affects: neutron
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1784006
Title:
Instances miss neutron QoS on their ports after unrescue and soft
reboot
Status in neutron:
New
Status in OpenStack Compute (nova):
New
Bug description:
Instances misses neutron QoS on their ports after unrescue and soft
reboot
Description
===========
After some operations with instance: such as unrescue and soft reboot
libvirt domains are created, but neutron doesn't set QoS on ports for VM.
So user can avoid QoS per-port limitation and utilise all
hosts bandwidth.
This doesn't happend after live migration, migration, hard reboot,
rescue, shutdown with start.
This problem doesn't happen for operations which ends up calling
_create_domain_and_network():
https://github.com/openstack/nova/blob/stable/pike/nova/virt/libvirt/driver.py#L5392
In unrescue and soft reboot libvirt driver calls _create_domain() directly
and don't execute plug_vifs():
https://github.com/openstack/nova/blob/stable/pike/nova/virt/libvirt/driver.py#L2547
Steps to reproduce
==================
1. Create instance with port in neutron network
2. Create QoS in neutron:
$ neutron qos-policy-create limited_1000mbps
$ neutron qos-bandwidth-limit-rule-create limited_1000mbps --max-kbps
1000000 --max-burst-kbps 160000
3. Update port of the instance, assign policy:
$ neutron port-update --qos-policy limited_1000mbps PORT_UUID
4. Ensure, that QoS rule is applied to the port:
$ /sbin/tc -s qdisc show dev tap47eaf544-39
qdisc pfifo_fast 0: root refcnt 2 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1
1 1 1
Sent 383621004 bytes 262469 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
qdisc ingress ffff: parent ffff:fff1 ----------------
Sent 173850 bytes 1515 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
5. 1) Execute nova rescue and then nova unrescue for the instance
or
2) Execute nova reboot (without parameter --hard)
6. See, that after tap interface recreation during libvirt domain start
QoS are gone:
$ /sbin/tc -s qdisc show dev tap47eaf544-39
qdisc pfifo_fast 0: root refcnt 2 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1
1 1 1
Sent 1537 bytes 19 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
Expected result
===============
QoS rules are applied to the port, like in step 4.
Actual result
=============
QoS rules are gone, tap interface is not limited:
$ /sbin/tc -s qdisc show dev tap47eaf544-39
qdisc pfifo_fast 0: root refcnt 2 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1
1 1 1
Sent 1537 bytes 19 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
Environment
===========
1. Exact version of OpenStack:
OpenStack Pike
nova 16.1.4
neutron 11.0.5
2. Which networking type did you use?
Neutron with Open vSwitch
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