I haven't been able to reproduce this lately using my single node devstack w/ovs env. Closing as invalid. If the issue (re)crops up, I'll reopen the dug accordingly.
** Changed in: neutron Status: In Progress => Invalid -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to neutron. https://bugs.launchpad.net/bugs/1567049 Title: DHCP agent not reusing iface device when namespace is missing Status in neutron: Invalid Bug description: Using neutron master with devstack all-in-one installation. Under specific circumstances, the neutron dhcp agent (with dnsmasq driver) will incorrectly create a new interface device rather than reusing the existing one if the network's namespace is accidentally deleted. 1. Neutron net created. 2. Neutron subnet created for network in step #1 with dhcp enabled. 3. Network dhcp namespace accidentally deleted. 4. New subnet added to network in #1 with dhcp enabled. --> DHCP agent incorrectly creates a new interface device rather than reusing the existing. The initial iface is now "orphaned". The script below reproduces the error on my devstack all-in-one: ------------ #!/bin/bash source ~/devstack/openrc admin admin neutron net-create dhcp-net echo "Interfaces before..." sudo ovs-vsctl show neutron subnet-create dhcp-net 192.168.1.0/24 --name dhcp-subnet1 sleep 2 for ns in `sudo ip netns list | grep qdhcp-*`; do echo "Deleting namespace $ns" sudo ip netns delete ${ns} done neutron subnet-create dhcp-net 192.168.2.0/24 --name dhcp-subnet2 sleep 2 neutron net-delete dhcp-net sleep 2 echo "Interfaces after..." sudo ovs-vsctl show ------------ Sample ovs output from running the script: -------- ... Interfaces before... 0b073a08-021d-49d9-b176-5008bf87ae39 Manager "tcp:127.0.0.1:6632" Bridge br-int Port br-int Interface br-int type: internal ovs_version: "2.0.2" ... Interfaces after... 0b073a08-021d-49d9-b176-5008bf87ae39 Manager "tcp:127.0.0.1:6632" Bridge br-int Port br-int Interface br-int type: internal Port "tapcf35e3b7-06" Interface "tapcf35e3b7-06" ovs_version: "2.0.2" -------- As shown in the output, a port device is left over, even after the network + subnets are deleted. To manage notifications about this bug go to: https://bugs.launchpad.net/neutron/+bug/1567049/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp