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[OpenStack Infra <1797084@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/609324
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=8e60531d11401c2c509a1255b49f89bc2bf81a74
Submitter: Zuul
Branch:    master

commit 8e60531d11401c2c509a1255b49f89bc2bf81a74
Author: Daniel Alvarez <dalvarez@xxxxxxxxxx>
Date:   Wed Oct 10 10:25:17 2018 +0200

    Exclude fallback tunnel devices from netns cleanup
    
    When a namespace gets created, if the fb_tunnels_only_for_init_net
    sysctl configuration is set to 0, the fallback tunnels will be
    automatically created if the corresponding tunnel is present
    in the initial network namespace. Source [0].
    
    This is being observed in some systems where namespaces are not
    getting cleaned up due to the presence of such devices as
    ip_lib.namespace_is_empty() is returning False.
    
    This patch is adding such devices as per the kernel documentation
    to the list of excluded devices by default.
    
    [0] https://www.kernel.org/doc/Documentation/sysctl/net.txt
    
    Closes-Bug: #1797084
    Change-Id: I94415a0da5367e2d98d792a5eb4ba3919b838326
    Signed-off-by: Daniel Alvarez <dalvarez@xxxxxxxxxx>


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

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https://bugs.launchpad.net/bugs/1797084

Title:
  Stale namespaces when fallback tunnels are present

Status in networking-ovn:
  New
Status in neutron:
  Fix Released

Bug description:
  When a network namespace is created, if the sysctl
  fb_tunnels_only_for_init_net option is set to 0 (by default), fallback
  tunnel devices will be automatically created if the initial namespace
  had those in.

  This leads to neutron ip_lib detecting namespaces as 'not empty' thus
  unable to clean them up.

  We need to add these devices so that they are taken into account when
  determining if a namespace is empty or not.

  More info at: https://www.kernel.org/doc/Documentation/sysctl/net.txt

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