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Install CRDs from a subchart instead of using Helm 3 crds directory #1637

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cmontemuino opened this issue Mar 22, 2024 · 8 comments · May be fixed by #1922
Open

Install CRDs from a subchart instead of using Helm 3 crds directory #1637

cmontemuino opened this issue Mar 22, 2024 · 8 comments · May be fixed by #1922
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kind/feature Categorizes issue or PR as related to a new feature.
Milestone
v0.18

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@cmontemuino
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What would you like to be added:
Depart away from Helm 3 way to install CRDs and use a subchart for it.

Why is this needed:

Moving CRDs to a chart solves several issues: clean uninstall, possibility for upgrades, templating.

Motivation and Context

My main motivation is to have a better experience when managing this operator with Argo CD. That said, moving away from Helm 3 approach to install CRDs might be helpful in other scenarios too. I'm posting the full rationale below.

Helm 3 does not manage CRDs (see https://helm.sh/docs/chart_best_practices/custom_resource_definitions/). helm uninstall won't remove CRDs, and helm updgrade won't upgrade them. Manual intervention is required with the current setup.

  • CRDs installed from crds folder are not included into the helm release.
  • Additionally, it is not possible to template CRDs in Helm 3 in the crds folder.

The following comes from helm best practices around CRDs:

There is no support at this time for upgrading or deleting CRDs using Helm. This was an explicit decision after much community discussion due to the danger for unintentional data loss.

ref: https://helm.sh/docs/chart_best_practices/custom_resource_definitions/#method-1-let-helm-do-it-for-you

Another alternatively, which is what I propose and comes from Helm page:

Another way to do this is to put the CRD definition in one chart, and then put any resources that use that CRD in another chart.

In this method, each chart must be installed separately. However, this workflow may be more useful for cluster operators who have admin access to a cluster

ref: https://helm.sh/docs/chart_best_practices/custom_resource_definitions/#method-2-separate-charts

I'm completely fine to open a PR with the required refactoring, without impacting current installations.
@cmontemuino cmontemuino added the kind/feature Categorizes issue or PR as related to a new feature. label Mar 22, 2024
@cmontemuino cmontemuino changed the title Installa CRDs from a subchart instead of using Helm 3 crds directory Install CRDs from a subchart instead of using Helm 3 crds directory Mar 22, 2024
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/lifecycle stale

@k8s-ci-robot k8s-ci-robot added the lifecycle/stale Denotes an issue or PR has remained open with no activity and has become stale. label Jun 20, 2024
@cmontemuino
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/remove-lifecycle stale

@k8s-ci-robot k8s-ci-robot removed the lifecycle/stale Denotes an issue or PR has remained open with no activity and has become stale. label Jul 1, 2024
@marquiz
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marquiz commented Jul 9, 2024

@cmontemuino thanks for the proposal. I like the idea 👍 Helm 3 CRD management is b0rken if you ask me as an end-user.

Would you be wiling to work on this?

@marquiz
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marquiz commented Jul 9, 2024

ping @ArangoGutierrez @yevgeny-shnaidman

@yevgeny-shnaidman
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@marquiz we once talked about unifying node-feature-dscovery and node-feature-discovery-operator repos. If this is something that we might start doing in a near future, that IMHO this issue might better be implemented after unification.

@ArangoGutierrez
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ArangoGutierrez commented Jul 23, 2024 •
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@marquiz
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marquiz commented Sep 5, 2024

/milestone v0.18

@k8s-ci-robot k8s-ci-robot added this to the v0.18 milestone Sep 5, 2024
cmontemuino added a commit to cmontemuino/node-feature-discovery that referenced this issue Oct 22, 2024
@cmontemuino
feat: install CRDs from a subchart
2ec2038 
ROBLEM: Helm 3 only install CRDs during the chart installation. Both
deletes and upgrades are not handled by Helm 3. It requires manual
intervention. Additionally, it is not possible to template CRDs. This is
especially important when installing the chart with an Argo CD
application.

SOLUTION: add the possibility to install the CRDs from a dependency
subchart. This allows clean uninstall, possibility for automated
upgrades, and templating. This feature comes disabled by default.

closes kubernetes-sigs#1637

Signed-off-by: cmontemuino <1761056+cmontemuino@users.noreply.github.com>
@cmontemuino cmontemuino linked a pull request Oct 22, 2024 that will close this issue
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@cmontemuino
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Initial PR: #1922

I don't know exactly how the documentation is supposed to be authored, so I've updated with the minimal details possible.

cmontemuino added a commit to cmontemuino/node-feature-discovery that referenced this issue Oct 22, 2024
@cmontemuino
helm: install CRDs from a subchart
c60d355 
PROBLEM: Helm 3 only install CRDs during the chart installation. Both
deletes and upgrades are not handled by Helm 3. It requires manual
intervention. Additionally, it is not possible to template CRDs. This is
especially important when installing the chart with an Argo CD
application.

SOLUTION: add the possibility to install the CRDs from a dependency
subchart. This allows clean uninstall, possibility for automated
upgrades, and templating. This feature comes disabled by default.

closes kubernetes-sigs#1637

Signed-off-by: cmontemuino <1761056+cmontemuino@users.noreply.github.com>
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feat: install CRDs from a subchart cmontemuino/node-feature-discovery
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@marquiz @cmontemuino @ArangoGutierrez @k8s-ci-robot @k8s-triage-robot @yevgeny-shnaidman