[Bug 2038109] Re: [SRU] Failed to create port on network <UUID>, because fixed_ips included invalid subnet <UUID>

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~freyes/ubuntu/+source/magnum/+git/magnum/+merge/470643

** Merge proposal linked:
   https://code.launchpad.net/~freyes/ubuntu/+source/magnum/+git/magnum/+merge/470644

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https://bugs.launchpad.net/bugs/2038109

Title:
  [SRU] Failed to create port on network <UUID>, because fixed_ips
  included invalid subnet <UUID>

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive antelope series:
  In Progress
Status in Ubuntu Cloud Archive bobcat series:
  Won't Fix
Status in Ubuntu Cloud Archive ussuri series:
  New
Status in Ubuntu Cloud Archive yoga series:
  New
Status in Ubuntu Cloud Archive zed series:
  Won't Fix
Status in Magnum:
  Fix Released
Status in magnum package in Ubuntu:
  Confirmed
Status in magnum source package in Focal:
  In Progress
Status in magnum source package in Jammy:
  In Progress

Bug description:
  [Impact]

  When creating a new "cluster"that overrides the fixed network defined
  in the cluster template, but not the subnet.

  It would be expected that the cluster create request fails with a 400
  error since the client is submitting an invalid request.

  [Environment]

  Focal Ussuri

  [Test Case]

  1. Create a new cluster template WITHOUT a fixed network/subnet set.
  openstack coe cluster template create k8s-cluster-template \
      --image fedora-coreos-32 \
      --keypair testkey \
      --external-network ext_net \
      --flavor m1.small \
      --network-driver flannel \
      --coe kubernetes \
      --fixed-network admin_net \
      --fixed-subnet admin_subnet

  2. Create a new cluster using the template previously created and
  select an existing network

  openstack coe cluster create \
      --cluster-template k8s-cluster-template \
      --timeout 120 \
      --fixed-network private \
      k8scluster

  Expected result

  The cluster gets created

  Actual result:

  The cluster creation fails with the following error:

  $ openstack coe cluster show k8scluster -f json -c faults | jq -r '.faults'
  {
    "default-master": "Resource CREATE failed: BadRequest: resources.kube_masters.resources[0].resources.kube_master_eth0: Invalid input for operation: Failed to create port on network 525df7a4-1aeb-4eae-a37f-432a809a8161, because fixed_ips included invalid subnet 30e1b4ed-811f-4226-a19d-0a56cc72fc10.\nNeutron server returns request_ids: ['req-7a55a40a-3aa3-4a67-8ecf-b2e47ae16a84']",
    "default-worker": "Resource CREATE failed: BadRequest: resources.kube_masters.resources[0].resources.kube_master_eth0: Invalid input for operation: Failed to create port on network 525df7a4-1aeb-4eae-a37f-432a809a8161, because fixed_ips included invalid subnet 30e1b4ed-811f-4226-a19d-0a56cc72fc10.\nNeutron server returns request_ids: ['req-7a55a40a-3aa3-4a67-8ecf-b2e47ae16a84']"
  }

  [ Where problems could occur ]

  - This change introduces validation of the configuration passed by the
  user during the creation of a new cluster, issues can be raised during
  the creation of new clusters, but not for already created clusters.

  [ Other Info ]

  - The patches associated to this SRU were merged during the OpenStack 2024.1 (Caracal) devel cycle
  - Patches
    + https://opendev.org/openstack/magnum/commit/753baadbb8b5b4c3032d4618166b1c899a50fb07
    + https://opendev.org/openstack/magnum/commit/a8bce0bfee81218cd1c0ddcf3e2b86b96659933e

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