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[sutefun <1841582@xxxxxxxxxxxxxxxxxx>]

** Project changed: nova => cloud-images

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https://bugs.launchpad.net/bugs/1841582

Title:
  Interface detach and attach does not work with CentOS 7 and Ubuntu
  18.04 cloud images

Status in cloud-images:
  New

Bug description:
  Hello,

  I uploaded

  bionic-server-cloudimg-amd64.img

  into glance. I started an Instance. The instance is reachable.

  Next i shutdown the instance
  openstack server stop <instance-id>
  detach the interface
  openstack server remove network <instance-id> <network>
  afterwards I attach a new interface with the same IP as before
  openstack server add fixed ip --fixed-ip-address <IP-address> <instance-id> <network>
  then start the instance and the instance is not reachable.

  I can reproduce this behaviour with.

  bionic-server-cloudimg-amd64.img
  CentOS-7-x86_64-GenericCloud-1907.qcow2

  
  This does not happen with :
  CentOS-6-x86_64-GenericCloud-1907.qcow2
  xenial-server-cloudimg-amd64-disk1.img
  trusty-server-cloudimg-amd64-disk1.img 
  cirros-0.4.0-x86_64-disk.img

  The images are unchanged.
  I logged in via local console into ubuntu 18:04. The interface was down and I could see the following logs:

  Aug 26 08:38:17 os-steb-pa1 systemd[1]: Starting Apply the settings specified in cloud-config...
  Aug 26 08:38:17 os-steb-pa1 networkd-dispatcher[754]: No valid path found for iwconfig
  Aug 26 08:38:17 os-steb-pa1 networkd-dispatcher[754]: No valid path found for iw

  A dhclient -v <interface> started the interface and the the instance
  got an answer from dhcp and was reachable again.

  I logged in via local console into CentOS 7. The interface was also
  down and I could see the following logs:

  Aug 26 09:05:37 os-steb-cl1 network: Bringing up interface eth0:  ERROR     : [/etc/sysconfig/network-scripts/ifup-eth] Device eth0 has different MAC address than expected, ignoring.
  Aug 26 09:05:37 os-steb-cl1 /etc/sysconfig/network-scripts/ifup-eth: Device eth0 has different MAC address than expected, ignoring.
  Aug 26 09:05:37 os-steb-cl1 network: [FAILED]
  Aug 26 09:05:37 os-steb-cl1 systemd: network.service: control process exited, code=exited status=1

  A dhclient -v <interface> started the interface and the the instance
  got an answer from dhcp and was reachable again.

  The problem is the old mac address in

  ubuntu 18.04 /etc/netplan/50-cloud-init.yaml

  centos 7 /etc/sysconfig/network-scripts/ifcfg-eth0

  Manually changing the mac address in these files to the new one,
  solves the problem and the instances are reachable again after
  reboots.

  I don't know how the mechanism worked for the older operating systems
  to establish a network connection after the interface changed via
  openstack, but this seems to be broken with the newer operating
  systems.

  Environment
  ===========================
  1.
  Rocky

  ii  nova-api                                  2:18.1.0-0ubuntu1~cloud0               all          OpenStack Compute - API frontend
  ii  nova-common                               2:18.1.0-0ubuntu1~cloud0               all          OpenStack Compute - common files
  ii  nova-conductor                            2:18.1.0-0ubuntu1~cloud0               all          OpenStack Compute - conductor service
  ii  nova-consoleauth                          2:18.1.0-0ubuntu1~cloud0               all          OpenStack Compute - Console Authenticator
  ii  nova-novncproxy                           2:18.1.0-0ubuntu1~cloud0               all          OpenStack Compute - NoVNC proxy
  ii  nova-placement-api                        2:18.1.0-0ubuntu1~cloud0               all          OpenStack Compute - placement API frontend
  ii  nova-scheduler                            2:18.1.0-0ubuntu1~cloud0               all          OpenStack Compute - virtual machine scheduler
  ii  python-nova                               2:18.1.0-0ubuntu1~cloud0               all          OpenStack Compute Python 2 libraries

  2.
  Libvirt + KVM

  ii  qemu-kvm                                  1:2.11+dfsg-1ubuntu7.17
  amd64        QEMU Full virtualization on x86 hardware

  ii  libvirt-daemon                            4.0.0-1ubuntu8.12                      amd64        Virtualization daemon
  ii  libvirt-daemon-driver-storage-rbd         4.0.0-1ubuntu8.12                      amd64        Virtualization daemon RBD storage driver
  ii  libvirt0:amd64                            4.0.0-1ubuntu8.12                      amd64        library for interfacing with different virtualization systems
  ii  python-libvirt                            4.0.0-1                                amd64        libvirt Python bindings

  3.
  Neutron with OpenVSwitch and dvr_snat

  Greets

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