[Bug 2015377] Fix proposed to neutron (stable/ussuri)
OpenStack Infra
2015377 at bugs.launchpad.net
Thu May 18 13:51:54 UTC 2023
Fix proposed to branch: stable/ussuri
Review: https://review.opendev.org/c/openstack/neutron/+/883508
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https://bugs.launchpad.net/bugs/2015377
Title:
[ovn] If dhcp port is deleted from neutron, it is never recreated
Status in neutron:
Fix Released
Status in neutron package in Ubuntu:
New
Bug description:
This is happening in charmed OpenStack yoga/stable using ovn 22.03.
Neutron version is 2:20.2.0-0ubuntu1
If the dhcp port of a subnet is deleted via OpenStack API, this will
never be recreated even toggling the dhcp on the subnet with:
openstack subnet set --no-dhcp/--dhcp <uuid>
This will cause also a missing route for metadata in OVN DHCP_Options:
i.e.
_uuid : 2d4871f5-b675-4978-b291-a1ea7bb5bd4c
cidr : "192.168.100.0/24"
external_ids : {"neutron:revision_number"="1", subnet_id="62b269e0-6668-48ae-9728-aacd7a99df95"}
options : {dns_server="{91.189.91.131, 91.189.91.132}", lease_time="43200", mtu="1500", router="192.168.100.1", server_id="192.168.100.1", server_mac="fa:16:3e:15:13:e6"}
Note the missing classless_static_route="{169.254.169.254/32,192.168.100.2,0.0.0.0/0,192.168.100.1}"
Even if the dhcp port is then recreated manually with device-id ovnmeta-<net-uuid> and device-owner network:distributed, the missing route won't be added to ovn causing VM creation failure.
The routes will appear again in OVN DHCP_Options table only when
updating the subnet host-routes with:
openstack subnet set --host-route destination=<subnet>,gateway=<ip-
address> <uuid>
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