e37722c0f5
DPDK vhostuser mode (DPDK/vhu) means that when an instance is powered off the port is deleted, and when an instance is powered on a port is created. This means a reboot is functionally a super fast delete-then-create. Neutron trunking mode in combination with DPDK/vhu implements a trunk bridge for each tenant, and the ports for the instances are created as subports of that bridge. The standard way a trunk bridge works is that when all the subports are deleted, a thread is spawned to delete the trunk bridge, because that is an expensive and time-consuming operation. That means that if the port in question is the only port on the trunk on that compute node, this happens: 1. The port is deleted 2. A thread is spawned to delete the trunk 3. The port is recreated If the trunk is deleted after #3 happens then the instance has no networking and is inaccessible; this is the scenario that was dealt with in a previous change [1]. But there continue to be issues with errors "RowNotFound: Cannot find Bridge with name=tbr-XXXXXXXX-X". What is happening in this case is that the trunk is being deleted in the middle of the execution of #3, so that it stops existing in the middle of the port creation logic but before the port is actually recreated. Since this is a timing issue between two different threads it's difficult to stamp out entirely, but I think the best way to do it is to add a slight delay in the trunk deletion thread, just a second or two. That will give the port time to come back online and avoid the trunk deletion entirely. [1] https://review.opendev.org/623275 Related-Bug: #1869244 Change-Id: I36a98fe5da85da1f3a0315dd1a470f062de6f38b |
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| devstack | ||
| doc | ||
| etc | ||
| neutron | ||
| playbooks | ||
| rally-jobs | ||
| releasenotes | ||
| roles | ||
| tools | ||
| vagrant/ovn | ||
| zuul.d | ||
| .coveragerc | ||
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| .gitreview | ||
| .mailmap | ||
| .pylintrc | ||
| .stestr.conf | ||
| CONTRIBUTING.rst | ||
| HACKING.rst | ||
| LICENSE | ||
| README.rst | ||
| TESTING.rst | ||
| babel.cfg | ||
| bindep.txt | ||
| lower-constraints.txt | ||
| requirements.txt | ||
| setup.cfg | ||
| setup.py | ||
| test-requirements.txt | ||
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README.rst
OpenStack Neutron
Neutron is an OpenStack project to provide "network connectivity as a service" between interface devices (e.g., vNICs) managed by other OpenStack services (e.g., Nova).
To learn more about neutron:
- Documentation: https://docs.openstack.org/neutron/latest/
- Features: https://specs.openstack.org/openstack/neutron-specs
- Defects: https://launchpad.net/neutron
- Release notes: https://docs.openstack.org/releasenotes/neutron/index.html
- Source: https://opendev.org/openstack/neutron
Get in touch via email. Use [Neutron] in your subject.
To learn how to contribute, please read the CONTRIBUTING.rst file.