resize does not migrate DHCP host information

The reason is :

network_api.setup_networks_on_host is called before _instance_update(host=migration_ref['dest_compute']) in compute.manager._finish_resize, thus db.network_get_associated_fixed_ips(host='dest_compute_name') will not return this
instance's DHCP host info in FlatDHCPManager._setup_networks_on_host().

Update instance's host to dest_compute_node_name before setup_networks_on_host would fix this.

Fix proposed to branch: master
Review: https://review.openstack.org/14382

might be good to check if a similar fix is needed for live/block migration

Reviewed: https://review.openstack.org/14382
Committed: http://github.com/openstack/nova/commit/9ea41fc80b46b0c5adbab3ea191b92583feb02e0
Submitter: Jenkins
Branch: master

commit 9ea41fc80b46b0c5adbab3ea191b92583feb02e0
Author: Jian Wen <email address hidden>
Date: Fri Oct 12 15:52:17 2012 +0800

    Migrate DHCP host info during resize

    Update instance host to migration_ref['dest_compute'] before
    update_dhcp to make its DHCP host info will be written in dhcp-hostsfile.

    Make similiar change in finish_revert_resize.

    Fixes bug 1065440

    Change-Id: I9d3e0ebf8512f98f2943999e7ad95bc58f2bf585

Hi, vish

I will check.

live/block migration is fine

Fix proposed to branch: stable/folsom
Review: https://review.openstack.org/16714

Reviewed: https://review.openstack.org/16714
Committed: http://github.com/openstack/nova/commit/65a2d0a3ce869ffa80344fed94a54e92de57a0c2
Submitter: Jenkins
Branch: stable/folsom

commit 65a2d0a3ce869ffa80344fed94a54e92de57a0c2
Author: Jian Wen <email address hidden>
Date: Fri Oct 12 15:52:17 2012 +0800

    Migrate DHCP host info during resize

    Update instance host to migration_ref['dest_compute'] before
    update_dhcp to make its DHCP host info will be written in dhcp-hostsfile.

    Make similiar change in finish_revert_resize.

    Fixes bug 1065440

    Change-Id: I9d3e0ebf8512f98f2943999e7ad95bc58f2bf585
    (cherry picked from commit 9ea41fc80b46b0c5adbab3ea191b92583feb02e0)

I just ran into this issue on Essex/Precise. Is there hope for back port of this fix?

No. I don't think so.
Many bugs(10+) has been fixed after Essex. Backporting is painful.

Hello Jian, or anyone else affected,

Accepted nova into quantal-proposed. The package will build now and be available at http://launchpad.net/ubuntu/+source/nova/2012.2.1+stable-20121212-a99a802e-0ubuntu1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

I will do it on Monday next week.

I can confirm that the package fixes the issue for Resize.

But, live/block migration does not migrate DHCP host information. We need a fix for that one as well.

This bug was fixed in the package nova - 2012.2.1+stable-20121212-a99a802e-0ubuntu1

---------------
nova (2012.2.1+stable-20121212-a99a802e-0ubuntu1) quantal-proposed; urgency=low

  * Ubuntu updates:
    - debian/control: Ensure novaclient is upgraded with nova,
      require python-keystoneclient >= 1:2.9.0. (LP: #1073289)
    - d/p/avoid_setuptools_git_dependency.patch: Refresh.
  * Dropped patches, applied upstream:
    - debian/patches/CVE-2012-5625.patch: [a99a802]
  * Resynchronize with stable/folsom (b55014ca) (LP: #1085255):
    - [a99a802] create_lvm_image allocates dirty blocks (LP: #1070539)
    - [670b388] RPC exchange name defaults to 'openstack' (LP: #1083944)
    - [3ede373] disassociate_floating_ip with multi_host=True fails
      (LP: #1074437)
    - [22d7c3b] libvirt imagecache should handle shared image storage
      (LP: #1075018)
    - [e787786] Detached and deleted RBD volumes remain associated with insance
      (LP: #1083818)
    - [9265eb0] live_migration missing migrate_data parameter in Hyper-V driver
      (LP: #1066513)
    - [3d99848] use_single_default_gateway does not function correctly
      (LP: #1075859)
    - [65a2d0a] resize does not migrate DHCP host information (LP: #1065440)
    - [102c76b] Nova backup image fails (LP: #1065053)
    - [48a3521] Fix config-file overrides for nova-dhcpbridge
    - [69663ee] Cloudpipe in Folsom: no such option: cnt_vpn_clients
      (LP: #1069573)
    - [6e47cc8] DisassociateAddress can cause Internal Server Error
      (LP: #1080406)
    - [22c3d7b] API calls to dis-associate an auto-assigned floating IP should
      return proper warning (LP: #1061499)
    - [bd11d15] libvirt: if exception raised during volume_detach, volume state
      is inconsistent (LP: #1057756)
    - [dcb59c3] admin can't describe all images in ec2 api (LP: #1070138)
    - [78de622] Incorrect Exception raised during Create server when metadata
      over 255 characters (LP: #1004007)
    - [c313de4] Fixed IP isn't released before updating DHCP host file
      (LP: #1078718)
    - [f4ab42d] Enabling Return Reservation ID with XML create server request
      returns no body (LP: #1061124)
    - [3db2a38] 'BackupCreate' should accept rotation parameter greater than or
      equal to zero (LP: #1071168)
    - [f7e5dde] libvirt reboot sometimes fails to reattach volumes
      (LP: #1073720)
    - [ff776d4] libvirt: detaching volume may fail while terminating other
      instances on the same host concurrently (LP: #1060836)
    - [85a8bc2] Used instance uuid rather than id in remove-fixed-ip
    - [42a85c0] Fix error on invalid delete_on_termination value
    - [6a17579] xenapi migrations fail w/ swap (LP: #1064083)
    - [97649b8] attach-time field for volumes is not updated for detach volume
      (LP: #1056122)
    - [8f6a718] libvirt: rebuild is not using kernel and ramdisk associated with
      the new image (LP: #1060925)
    - [fbe835f] live-migration and volume host assignement (LP: #1066887)
    - [c2a9150] typo prevents volume_tmp_dir flag from working (LP: #1071536)
    - [93efa21] Instances deleted during spawn leak network allocations
      (LP: #1068716)
    - [ebabd02] After restartin...