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🐛 Better checks before creating Floating IPs #2261

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🐛 Better checks before creating Floating IPs #2261

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EmilienM
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@EmilienM EmilienM commented Nov 19, 2024 •
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What this PR does / why we need it:

When a floating is created, we need to make sure that
OpenStackCluster.Spec.DisableExternalNetwork is not set to True.
Otherwise, we'll have a nil pointer error.

  • Add a check in reconcileBastion to check that external network is
    not disabled before creating the floating IP for the bastion.
  • Add a check in reconcileControlPlaneEndpoint and
    reconcileAPIServerLoadBalancer to check that external
    network is not disabled (alongside the DisableAPIServerFloatingIP
    check) before creating the floating IP for the API server endpoint.
  • Add a safeguard in GetOrCreateFloatingIP to return a proper error
    (instead of a nil pointer error) when
    openStackCluster.Status.ExternalNetwork is nil.
  • Add API CEL to check that when DisableExternalNetwork is set and true,
    the bastion (if defined) doesn't have a floating IP defined and also
    that disableAPIServerFloatingIP (when set) is not False.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #2260

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@k8s-ci-robot k8s-ci-robot added cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. size/S Denotes a PR that changes 10-29 lines, ignoring generated files. labels Nov 19, 2024
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@EmilienM
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/cc mdbooth

@EmilienM EmilienM changed the title 🐛 Better conditions for creating Floating IPs 🐛 Better checks for creating Floating IPs Nov 19, 2024
@EmilienM EmilienM changed the title 🐛 Better checks for creating Floating IPs 🐛 Better checks before creating Floating IPs Nov 19, 2024
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I initially wanted to do some webhook to just disallow DisableExternalNetwork to be True without also setting DisableAPIServerFloatingIP to True but it's not backward compatible and sucks for our users, so I did that.

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/test pull-cluster-api-provider-openstack-e2e-test
flake

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/cherry-pick release-0.11

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@EmilienM: once the present PR merges, I will cherry-pick it on top of release-0.11 in a new PR and assign it to you.

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/cherry-pick release-0.11

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/lgtm

Any idea how far back we need to backport this? 0.11 at least.

@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Nov 19, 2024
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EmilienM commented Nov 19, 2024 •
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/lgtm

Any idea how far back we need to backport this? 0.11 at least.

I'll investigate.
EDIT: backport is clean \o/

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On this one I want an eye from @lentzi90.

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/cherry-pick release-0.10

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/cherry-pick release-0.10

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I initially wanted to do some webhook to just disallow DisableExternalNetwork to be True without also setting DisableAPIServerFloatingIP to True but it's not backward compatible and sucks for our users

Sure not backwards compatible, but do you mean that it is actually possible to use that configuration? I'm thinking it is ok to break backwards compatibility if all it was doing was cause nil pointer exceptions.

controllers/openstackcluster_controller.go Show resolved Hide resolved
@k8s-ci-robot k8s-ci-robot added size/M Denotes a PR that changes 30-99 lines, ignoring generated files. and removed lgtm "Looks good to me", indicates that a PR is ready to be merged. size/S Denotes a PR that changes 10-29 lines, ignoring generated files. labels Nov 19, 2024
@k8s-ci-robot k8s-ci-robot added size/L Denotes a PR that changes 100-499 lines, ignoring generated files. and removed size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels Nov 19, 2024
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/lgtm
Looks good, and no need for extra logging now that the webhook immediately tells the user what is wrong 🙂

@k8s-ci-robot k8s-ci-robot added lgtm "Looks good to me", indicates that a PR is ready to be merged. and removed lgtm "Looks good to me", indicates that a PR is ready to be merged. labels Nov 20, 2024
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New changes are detected. LGTM label has been removed.

@EmilienM EmilienM changed the title 🐛 Better checks before creating Floating IPs 🐛 WIP - Better checks before creating Floating IPs Nov 20, 2024
@k8s-ci-robot k8s-ci-robot added size/M Denotes a PR that changes 30-99 lines, ignoring generated files. and removed size/L Denotes a PR that changes 100-499 lines, ignoring generated files. labels Nov 20, 2024
@EmilienM
Better conditions for creating Floating IPs
5429b4b 
When a floating is created, we need to make sure that
`OpenStackCluster.Spec.DisableExternalNetwork` is not set to `True`.
Otherwise, we'll have a nil pointer error.

* Add a check in `reconcileBastion` to check that external network is
  not disabled before creating the floating IP for the bastion.
* Add a check in `reconcileControlPlaneEndpoint` and
  `reconcileAPIServerLoadBalancer` to check that external
  network is not disabled (alongside the DisableAPIServerFloatingIP
  check) before creating the floating IP for the API server endpoint.
* Add a safeguard in `GetOrCreateFloatingIP` to return a proper error
  (instead of a nil pointer error) when
  `openStackCluster.Status.ExternalNetwork` is nil.
* Add API CEL to check that when DisableExternalNetwork is set and true,
  the bastion (if defined) doesn't have a floating IP defined and also
  that disableAPIServerFloatingIP (when set) is not False.
@EmilienM EmilienM changed the title 🐛 WIP - Better checks before creating Floating IPs 🐛 Better checks before creating Floating IPs Nov 21, 2024
lentzi90
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I'm happy with this, but as mentioned on slack, I have one concern.
Sorry I didn't think of it earlier.

Will the user ever be the one setting the floating IP? Or are we now just going to block the controller trying to add it?

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I'm happy with this, but as mentioned on slack, I have one concern. Sorry I didn't think of it earlier.

Will the user ever be the one setting the floating IP? Or are we now just going to block the controller trying to add it?

yes, a user can set the FIP:

cluster-api-provider-openstack/controllers/openstackcluster_controller.go

Lines 422 to 424 in 5429b4b

case openStackCluster.Spec.Bastion.FloatingIP != nil:
// Use floating IP from the spec
floatingIP = openStackCluster.Spec.Bastion.FloatingIP

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panic when setting disableExternalNetwork: true
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