openstack报错：nova.compute.manager nova.exception.PortBindingFailed

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2021-03-25 05:39:29.986 50398 ERROR nova.compute.manager nova.exception.PortBindingFailed: Binding failed for port d5b2d94a-b79a-4d6b-93ec-9c5a19b5221e, please check neutron logs for more information.

根据提示是nova组建报错，查看nova相关日志，提示查看neutron相关日志。
查看/var/log/neutron/linuxbridge-agent.log发现该日志一直在刷新，查看neutron相关服务，发现neutron-linuxbridge-agent服务一直在重启

2021-03-25 07:07:06.327 469548 WARNING oslo.privsep.daemon [-] privsep log: PermissionError: [Errno 13] Permission denied: ‘/var/log/neutron/privsep-helper.log’
2021-03-25 07:07:06.432 469548 CRITICAL oslo.privsep.daemon [-] privsep helper command exited non-zero (1)
2021-03-25 07:07:06.433 469548 CRITICAL neutron [-] Unhandled error: oslo_privsep.daemon.FailedToDropPrivileges: privsep helper command exited non-zero (1)

解决
在/etc/sudoers.d/neutron中添加

neutron ALL = (root) NOPASSWD: /usr/bin/privsep-helper *