[Bug 2038663] Re: no option to override the fixed_subnet when creating a new cluster

[Felipe Reyes]

** Also affects: magnum-ui (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: magnum-ui (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: cloud-archive
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/victoria
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/bobcat
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/ussuri
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/wallaby
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/antelope
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/caracal
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/xena
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/yoga
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/zed
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2038663

Title:
  no option to override the fixed_subnet when creating a new cluster

Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive antelope series:
  New
Status in Ubuntu Cloud Archive bobcat series:
  New
Status in Ubuntu Cloud Archive caracal series:
  New
Status in Ubuntu Cloud Archive ussuri series:
  New
Status in Ubuntu Cloud Archive victoria series:
  New
Status in Ubuntu Cloud Archive wallaby series:
  New
Status in Ubuntu Cloud Archive xena series:
  New
Status in Ubuntu Cloud Archive yoga series:
  New
Status in Ubuntu Cloud Archive zed series:
  New
Status in Magnum UI:
  In Progress
Status in magnum-ui package in Ubuntu:
  Confirmed
Status in magnum-ui source package in Focal:
  New
Status in magnum-ui source package in Jammy:
  New

Bug description:
  [Impact]

  When a cluster template sets fixed_network and fixed_subnet and the
  user tries to create a new cluster using that template and decides to
  override the network, the fixed_subnet will inherited from the
  template, leaving an invalid configuration and later Neutron will
  refuse to allocate a port (since the subnet doesn't belong to the
  network). For more details see
  https://bugs.launchpad.net/ubuntu/+source/magnum/+bug/2038109

  [Test Case]

  1. Create a new cluster template with a fixed_network test-net and fixed_subnet test-subnet
  2. Create a new cluster, uncheck the option "Create new network" and pick a network different from test-net in the dropdown list.

  Expected result:

  The cluster gets created

  Actual result:

  The cluster creation fails, because the network configuration is
  invalid.

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