Comment 0 for bug 1894843
Revision history for this message
| ITD27M01 (igortiunov) wrote [dvr_snat] Router update deletes rfp interface from qrouter event when VM port is present on this host | #0 |
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1b1ed1a
(Get the code!)
Hello,
In the case of dvr_snat l3 agents are deployed on hypervisors there can be race condition. The agent creates snat namespaces on each scheduled host and removes them at second step. At this second step agent removes the rfp interface from qrouter even when there is VM with floating IP on the host.
When VM is deployed at the time of second step we can lost external access to VMs floating IP. The issue can be reproduced by hand:
1. Create tenant network and router with external gateway
2. Create VM with floating ip
3. Ensure that VM on the hypervisor without snat-* namespace
4. Set the router to disabled state (openstack router set --disable <router>)
5. Set the router to enabled state (openstack router set --enabled <router>)
6. The external access to VMs FIP have lost because L3 agent creates the qrouter namespace without rfp interface.
Environment:
1. Neutron with ML2 OVS plugin.
2. L3 agents in dvr_snat mode on each hypervisor
3. openstack-