yahoo-eng-team team mailing list archive

Thread
Date
[Bug 1662324] Re: linux bridge agent disables ipv6 before adding an ipv6 address

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: OpenStack Infra <1662324@xxxxxxxxxxxxxxxxxx>
Date: Wed, 22 Mar 2017 17:46:14 -0000
Reply-to: Bug 1662324 <1662324@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Reviewed:  https://review.openstack.org/431619
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=b6d4d382a9fc1088752ae9b010fb25d0fcdd5845
Submitter: Jenkins
Branch:    master

commit b6d4d382a9fc1088752ae9b010fb25d0fcdd5845
Author: Brian Haley <brian.haley@xxxxxxx>
Date:   Thu Feb 9 10:48:07 2017 -0500

    Fix linuxbridge agent startup issue with IPv6
    
    The linuxbridge agent tries to move all the IP addresses
    from the first interface attached to a bridge at startup.
    This can fail if the interface has an IPv6 address since
    IPv6 is always disabled on bridge devices.
    
    Change ensure_bridge() to not disable IPv6, and instead
    move all IPs and default route by family - IPv4 and IPv6.
    
    Change-Id: Ic236de04c0203633df49967a9a4528fda13c51df
    Closes-bug: #1662324


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

-- 
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to neutron.
https://bugs.launchpad.net/bugs/1662324

Title:
  linux bridge agent disables ipv6 before adding an ipv6 address

Status in neutron:
  Fix Released

Bug description:
  Summary:
  ========
  I have a dual-stack NIC with only an IPv6 SLAAC and link local address plumbed. This is the designated provider network nic. When I create a network and then a subnet, the linux bridge agent first disables IPv6 on the bridge and then tries to add the IPv6 address from the NIC to the bridge. Since IPv6 was disabled on the bridge, this fails with 'RTNETLINK answers: Permission denied'. My intent was to create an IPv4 subnet over this interface with floating IPv4 addresses for assignment to VMs via this command:
    openstack subnet create --network provider \
      --allocation-pool start=10.54.204.200,end=10.54.204.217 \
      --dns-nameserver 69.252.80.80 --dns-nameserver 69.252.81.81 \
      --gateway 10.54.204.129 --subnet-range 10.54.204.128/25 provider

  I don't know why the agent is disabling IPv6 (I wish it wouldn't),
  that's probably the problem. However, if the agent knows to disable
  IPv6 it should also know not to try to add an IPv6 address.

  Details:
  ========
  Version: Newton on CentOS 7.3 minimal (CentOS-7-x86_64-Minimal-1611.iso) as per these instructions: http://docs.openstack.org/newton/install-guide-rdo/

  Seemingly relevant section of /var/log/neutron/linuxbridge-agent.log:
  2017-02-06 15:09:20.863 1551 INFO neutron.plugins.ml2.drivers.linuxbridge.agent.arp_protect [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Skipping ARP spoofing rules for port 'tap3679987e-ce' because it has port security disabled
  2017-02-06 15:09:20.863 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Running command: ['ip', '-o', 'link', 'show', 'tap3679987e-ce'] create_process /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:89
  2017-02-06 15:09:20.870 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Exit code: 0 execute /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:146
  2017-02-06 15:09:20.871 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Running command: ['ip', 'addr', 'show', 'eno1', 'scope', 'global'] create_process /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:89
  2017-02-06 15:09:20.878 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Exit code: 0 execute /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:146
  2017-02-06 15:09:20.879 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Running command: ['ip', 'route', 'list', 'dev', 'eno1', 'scope', 'global'] create_process /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:89
  2017-02-06 15:09:20.885 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Exit code: 0 execute /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:146
  2017-02-06 15:09:20.886 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Running command (rootwrap daemon): ['ip', 'link', 'set', 'brqe1623c94-1f', 'up'] execute_rootwrap_daemon /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:105
  2017-02-06 15:09:20.895 1551 DEBUG neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Starting bridge brqe1623c94-1f for subinterface eno1 ensure_bridge /usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py:367
  2017-02-06 15:09:20.895 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Running command (rootwrap daemon): ['brctl', 'addbr', 'brqe1623c94-1f'] execute_rootwrap_daemon /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:105
  2017-02-06 15:09:20.905 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Exit code: 0 execute /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:146
  2017-02-06 15:09:20.905 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Running command (rootwrap daemon): ['brctl', 'setfd', 'brqe1623c94-1f', '0'] execute_rootwrap_daemon /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:105
  2017-02-06 15:09:20.909 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Exit code: 0 execute /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:146
  2017-02-06 15:09:20.910 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Running command (rootwrap daemon): ['brctl', 'stp', 'brqe1623c94-1f', 'off'] execute_rootwrap_daemon /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:105
  2017-02-06 15:09:20.913 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Exit code: 0 execute /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:146
  2017-02-06 15:09:20.914 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Running command (rootwrap daemon): ['sysctl', '-w', 'net.ipv6.conf.brqe1623c94-1f.disable_ipv6=1'] execute_rootwrap_daemon /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:105
  2017-02-06 15:09:20.919 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Exit code: 0 execute /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:146
  2017-02-06 15:09:20.919 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Running command (rootwrap daemon): ['ip', 'link', 'set', 'brqe1623c94-1f', 'up'] execute_rootwrap_daemon /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:105
  2017-02-06 15:09:20.922 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Exit code: 0 execute /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:146
  2017-02-06 15:09:20.923 1551 DEBUG neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Done starting bridge brqe1623c94-1f for subinterface eno1 ensure_bridge /usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py:379
  2017-02-06 15:09:20.923 1551 DEBUG neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Running command (rootwrap daemon): ['ip', '-6', 'addr', 'add', '2001:558:1046:12:cfb6:e0b9:d25f:4118/64', 'scope', 'global', 'dev', 'brqe1623c94-1f'] execute_rootwrap_daemon /usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py:105
  2017-02-06 15:09:20.927 1551 ERROR neutron.agent.linux.utils [req-4917c507-369e-4a36-a381-e8b287cbc988 - - - - -] Exit code: 2; Stdin: ; Stdout: ; Stderr: RTNETLINK answers: Permission denied

To manage notifications about this bug go to:
https://bugs.launchpad.net/neutron/+bug/1662324/+subscriptions
References

[Bug 1662324] [NEW] linux bridge agent disables ipv6 before adding an ipv6 address
From: David Reno, 2017-02-06