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[Bug 1623876] Re: nova is not setting the MTU provided by Neutron

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: OpenStack Infra <1623876@xxxxxxxxxxxxxxxxxx>
Date: Fri, 16 Sep 2016 03:23:40 -0000
Reply-to: Bug 1623876 <1623876@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Reviewed:  https://review.openstack.org/370681
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=77f546623bb6c0b2a4441940f1740abd45bd3352
Submitter: Jenkins
Branch:    master

commit 77f546623bb6c0b2a4441940f1740abd45bd3352
Author: John Garbutt <john.garbutt@xxxxxxxxxxxxx>
Date:   Thu Sep 15 11:29:45 2016 +0100

    Override MTU for os_vif attachments
    
    os-vif does not current respect the neutron provided mtu, it just uses
    the configuration inside os-vif. This is a big regression from mitaka
    and liberty.
    
    Long term, this is something os-vif will be able to do by correctly
    parsing and acting on the network info. For now we just set the mtu for
    a second time once os-vif has done what it wants to do.
    
    Closes-Bug: #1623876
    
    Change-Id: Id4ca38fa1bb84f8cdb5edcd9ccb7acd8c8e9b60c


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1623876

Title:
  nova is not setting the MTU provided by Neutron

Status in OpenStack Compute (nova):
  Fix Released
Status in os-vif:
  In Progress

Bug description:
  Spotted in gate grenade job. We can see neutron MTU is 1450 but the mtu set calls in privsep use 1500.
  http://logs.openstack.org/56/369956/3/gate/gate-grenade-dsvm-neutron-ubuntu-trusty/83daad8/logs/new/screen-n-cpu.txt.gz#_2016-09-15_01_16_57_512

  Relevant log snippet:

  2016-09-15 01:16:57.512 25573 DEBUG nova.network.os_vif_util [req-53929d93-d999-4035-8aae-f8d9fd1b2efb tempest-AttachInterfacesTestJSON-355908889 tempest-AttachInterfacesTestJSON-355908889] Converting VIF {"profile": {}, "ovs_interfaceid": "8dfdfd9b-da9d-4215-abbd-4dffdc48494b", "preserve_on_delete": false, "network": {"bridge": "br-int", "subnets": [{"ips": [{"meta": {}, "version": 4, "type": "fixed", "floating_ips": [], "address": "10.1.0.9"}], "version": 4, "meta": {}, "dns": [], "routes": [], "cidr": "10.1.0.0/28", "gateway": {"meta": {}, "version": 4, "type": "gateway", "address": "10.1.0.1"}}], "meta": {"injected": false, "tenant_id": "563ca55619b1402ebf0c792ec604a774", "mtu": 1450}, "id": "6e1f0d14-a238-4da9-a2d5-659a0f28479c", "label": "tempest-AttachInterfacesTestJSON-32449395-network"}, "devname": "tap8dfdfd9b-da", "vnic_type": "normal", "qbh_params": null, "meta": {}, "details": {"port_filter": true, "ovs_hybrid_plug": true}, "address": "fa:16:3e:38:52:12", "active": false, "type": "ovs", "id": "8dfdfd9b-da9d-4215-abbd-4dffdc48494b", "qbg_params": null} nova_to_osvif_vif /opt/stack/new/nova/nova/network/os_vif_util.py:362
  2016-09-15 01:16:57.513 25573 DEBUG nova.network.os_vif_util [req-53929d93-d999-4035-8aae-f8d9fd1b2efb tempest-AttachInterfacesTestJSON-355908889 tempest-AttachInterfacesTestJSON-355908889] Converted object VIFBridge(active=False,address=fa:16:3e:38:52:12,bridge_name='qbr8dfdfd9b-da',has_traffic_filtering=True,id=8dfdfd9b-da9d-4215-abbd-4dffdc48494b,network=Network(6e1f0d14-a238-4da9-a2d5-659a0f28479c),plugin='ovs',port_profile=VIFPortProfileBase,preserve_on_delete=False,vif_name='tap8dfdfd9b-da') nova_to_osvif_vif /opt/stack/new/nova/nova/network/os_vif_util.py:374
  2016-09-15 01:16:57.514 25573 DEBUG os_vif [req-53929d93-d999-4035-8aae-f8d9fd1b2efb tempest-AttachInterfacesTestJSON-355908889 tempest-AttachInterfacesTestJSON-355908889] Plugging vif VIFBridge(active=False,address=fa:16:3e:38:52:12,bridge_name='qbr8dfdfd9b-da',has_traffic_filtering=True,id=8dfdfd9b-da9d-4215-abbd-4dffdc48494b,network=Network(6e1f0d14-a238-4da9-a2d5-659a0f28479c),plugin='ovs',port_profile=VIFPortProfileBase,preserve_on_delete=False,vif_name='tap8dfdfd9b-da') plug /usr/local/lib/python2.7/dist-packages/os_vif/__init__.py:76
  2016-09-15 01:16:57.515 25573 DEBUG oslo.privsep.daemon [-] privsep: request[140021949493072]: (3, 'vif_plug_ovs.linux_net.ensure_bridge', (u'qbr8dfdfd9b-da',), {}) out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.515 25573 DEBUG oslo.privsep.daemon [-] Running cmd (subprocess): brctl addbr qbr8dfdfd9b-da out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.517 25573 DEBUG neutronclient.v2_0.client [req-6754757c-066c-488a-bc16-6bd451c28cdc tempest-ServerActionsTestJSON-1197364963 tempest-ServerActionsTestJSON-1197364963] GET call to neutron for http://127.0.0.1:9696/v2.0/subnets.json?id=2b899e3c-17dc-478a-bd39-91132bb057ab used request id req-e82dd927-a0f8-48ba-bbbc-56724a10a29d _append_request_id /usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py:127
  2016-09-15 01:16:57.521 25573 DEBUG oslo.privsep.daemon [-] CMD "brctl addbr qbr8dfdfd9b-da" returned: 0 in 0.005s out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.521 25573 DEBUG oslo.privsep.daemon [-] Running cmd (subprocess): brctl setfd qbr8dfdfd9b-da 0 out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.524 25573 DEBUG oslo.privsep.daemon [-] CMD "brctl setfd qbr8dfdfd9b-da 0" returned: 0 in 0.004s out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.524 25573 DEBUG oslo.privsep.daemon [-] Running cmd (subprocess): brctl stp qbr8dfdfd9b-da off out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.528 25573 DEBUG oslo.privsep.daemon [-] CMD "brctl stp qbr8dfdfd9b-da off" returned: 0 in 0.003s out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.528 25573 DEBUG oslo.privsep.daemon [-] Running cmd (subprocess): tee /sys/class/net/qbr8dfdfd9b-da/bridge/multicast_snooping out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.532 25573 DEBUG oslo.privsep.daemon [-] CMD "tee /sys/class/net/qbr8dfdfd9b-da/bridge/multicast_snooping" returned: 0 in 0.004s out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.532 25573 DEBUG oslo.privsep.daemon [-] Running cmd (subprocess): tee /proc/sys/net/ipv6/conf/qbr8dfdfd9b-da/disable_ipv6 out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.537 25573 DEBUG oslo.privsep.daemon [-] CMD "tee /proc/sys/net/ipv6/conf/qbr8dfdfd9b-da/disable_ipv6" returned: 0 in 0.004s out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.537 25573 DEBUG oslo.privsep.daemon [-] privsep: reply[140021949493072]: (4, None) out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.537 25573 DEBUG oslo.privsep.daemon [-] privsep: request[140021949493072]: (3, 'vif_plug_ovs.linux_net.create_veth_pair', ('qvb8dfdfd9b-da', 'qvo8dfdfd9b-da', 1500), {}) out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.538 25573 DEBUG oslo.privsep.daemon [-] Running cmd (subprocess): ip link add qvb8dfdfd9b-da type veth peer name qvo8dfdfd9b-da out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.546 25573 DEBUG oslo.privsep.daemon [-] CMD "ip link add qvb8dfdfd9b-da type veth peer name qvo8dfdfd9b-da" returned: 0 in 0.007s out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.547 25573 DEBUG oslo.privsep.daemon [-] Running cmd (subprocess): ip link set qvb8dfdfd9b-da up out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.550 25573 DEBUG oslo.privsep.daemon [-] CMD "ip link set qvb8dfdfd9b-da up" returned: 0 in 0.003s out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.550 25573 DEBUG oslo.privsep.daemon [-] Running cmd (subprocess): ip link set qvb8dfdfd9b-da promisc on out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.556 25573 DEBUG oslo.privsep.daemon [-] CMD "ip link set qvb8dfdfd9b-da promisc on" returned: 0 in 0.006s out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.556 25573 DEBUG oslo.privsep.daemon [-] Running cmd (subprocess): ip link set qvb8dfdfd9b-da mtu 1500 out_of_band /usr/local/lib/python2.7/dist-packages/oslo_privsep/daemon.py:194
  2016-09-15 01:16:57.560 25573 DEBUG oslo.privsep.daemon [-] CMD "ip link set qvb8dfdfd9b-da mtu 1500" returned: 0 in 0.004s out_of_band /usr/local/lib/python2.7/dist-

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References

[Bug 1623876] [NEW] nova is not setting the MTU provided by Neutron
From: Kevin Benton, 2016-09-15