** Also affects: cloud-archive/ocata
Importance: Undecided
Status: New
** No longer affects: cloud-archive/ocata
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https://bugs.launchpad.net/bugs/1722584
Title:
[SRU] Return traffic from metadata service may get dropped by
hypervisor due to wrong checksum
Status in Ubuntu Cloud Archive:
New
Status in Ubuntu Cloud Archive queens series:
New
Status in Ubuntu Cloud Archive rocky series:
New
Status in Ubuntu Cloud Archive stein series:
New
Status in Ubuntu Cloud Archive train series:
New
Status in neutron:
Fix Released
Bug description:
[Impact]
Prior addition of code to add checksum rules was found to cause problems with
newer kernels. Patch subsequently reverted so this request is to backport those
patches to the ubuntu archives.
[Test Case]
* deploy openstack (>= queens)
* create router/network/instance (dvr=false,l3ha=false)
* go to router ns on neutron-gateway and check that the following returns
nothing
sudo ip netns exec qrouter-<id> iptables -t mangle -S| grep '\--sport 9697 -j
CHECKSUM --checksum-fill'
[Regression Potential]
None expected
[Other Info]
This revert patch does not remove rules added by the original patch so manual
cleanup of those old rules is required.
-----------------------------------------------------------------------------
We have a problem with the metadata service not being responsive, when the
proxied in the router namespace on some of our networking nodes after upgrading
to Ocata (Running on CentOS 7.4, with the RDO packages).
Instance routes traffic to 169.254.169.254 to it's default gateway.
Default gateway is an OpenStack router in a namespace on a networking node.
- Traffic gets sent from the guest,
- to the router,
- iptables routes it to the metadata proxy service,
- response packet gets routed back, leaving the namespace
- Hypervisor gets the packet in
- Checksum of packet is wrong, and the packet gets dropped before putting it
on the bridge
Based on the following bug https://bugs.launchpad.net/openstack-
ansible/+bug/1483603, we found that adding the following iptable rule
in the router namespace made this work again: 'iptables -t mangle -I
POSTROUTING -p tcp --sport 9697 -j CHECKSUM --checksum-fill'
(NOTE: The rule from the 1st comment to the bug did solve access to
the metadata service, but the lack of precision introduced other
problems with the network)
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