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✨ Support storing Ignition user data in S3 bucket for AWSMachinePool #5318

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@AndiDog AndiDog commented Jan 22, 2025

What this PR does / why we need it:

Reopened from #5172 because of branch issues.

EC2 user data is insecure and very limited in size (16 KB). Use the S3 bucket storage also for machine pools. The difference to AWSMachine is that the S3 objects must stay around because a new instance could be started by the ASG at any time, and user data with a valid token must exist. Both a lifecycle policy for regular deletion, and explicit S3 object deletion requests, are used for cleanup, so that normally, only 1-3 launch template versions' user data are stored in S3. Each launch template version relates to one S3 object.

What type of PR is this?

/kind feature

Which issue(s) this PR fixes:

Didn't find an existing issue. My company ran into EC2 user data size limit problems.

Special notes for your reviewer:

This change has been successfully used in the Giant Swarm fork of CAPA since July 2024, on production clusters. I have adapted the change to the latest upstream changes, in particular the introduction of IgnitionStorageTypeOption (#4700) and made sure the previous default storage type is kept. Therefore, I retested this feature using Tilt on a plain CAPI@main + CAPA@main setup, with AWSCluster + Flatcar AMI + AWSMachinePool in my manifests.

Checklist:

  • squashed commits
  • includes documentation
  • includes emojis
  • adds unit tests
  • adds or updates e2e tests

Release note:

Support storing Ignition user data in S3 bucket for `AWSMachinePool`

@k8s-ci-robot k8s-ci-robot added release-note Denotes a PR that will be considered when it comes time to generate release notes. kind/feature Categorizes issue or PR as related to a new feature. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. labels Jan 22, 2025
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[APPROVALNOTIFIER] This PR is NOT APPROVED

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@k8s-ci-robot k8s-ci-robot added needs-priority size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. labels Jan 22, 2025
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AndiDog commented Jan 24, 2025

/test pull-cluster-api-provider-aws-test

@k8s-ci-robot k8s-ci-robot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jan 24, 2025
@k8s-ci-robot k8s-ci-robot removed the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jan 24, 2025
@AndiDog AndiDog force-pushed the s3-user-data branch 2 times, most recently from 0972f68 to 4a31f81 Compare January 24, 2025 08:59
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AndiDog commented Jan 24, 2025

/test pull-cluster-api-provider-aws-e2e

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AndiDog commented Jan 27, 2025

/test pull-cluster-api-provider-aws-e2e

@@ -280,7 +296,7 @@ func (r *AWSMachinePoolReconciler) reconcileNormal(ctx context.Context, machineP
machinePoolScope.Info("starting instance refresh", "number of instances", machinePoolScope.MachinePool.Spec.Replicas)
return asgsvc.StartASGInstanceRefresh(machinePoolScope)
}
if err := reconSvc.ReconcileLaunchTemplate(machinePoolScope, ec2Svc, canUpdateLaunchTemplate, runPostLaunchTemplateUpdateOperation); err != nil {
if err := reconSvc.ReconcileLaunchTemplate(machinePoolScope, machinePoolScope, s3Scope, ec2Svc, objectStoreSvc, canUpdateLaunchTemplate, runPostLaunchTemplateUpdateOperation); err != nil {
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why do we need to pass the same machinePoolScope twice?

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It gets cast to two different interfaces (IgnitionScope and LaunchTemplateScope). The number of small interfaces is to blame here, but many of them are needed to easily mock functionality or share functionality between regular and EKS cluster code and types.

@@ -607,7 +623,7 @@ func machinePoolToInfrastructureMapFunc(gvk schema.GroupVersionKind) handler.Map
}
}

func (r *AWSMachinePoolReconciler) getInfraCluster(ctx context.Context, log *logger.Logger, cluster *clusterv1.Cluster, awsMachinePool *expinfrav1.AWSMachinePool) (scope.EC2Scope, error) {
func (r *AWSMachinePoolReconciler) getInfraCluster(ctx context.Context, log *logger.Logger, cluster *clusterv1.Cluster, awsMachinePool *expinfrav1.AWSMachinePool) (scope.EC2Scope, scope.S3Scope, error) {
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It looks like there is no case where the first and second returned values are different. They are always both the same value, either nil or clusterScope or managedControlplaneScope. If both always have the same value, couldn't we just return one instead of two values?

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See above comment regarding interfaces

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/lgtm

@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Jan 28, 2025
@k8s-ci-robot k8s-ci-robot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Mar 14, 2025
@k8s-ci-robot k8s-ci-robot removed lgtm "Looks good to me", indicates that a PR is ready to be merged. needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. labels Mar 25, 2025
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AndiDog commented Mar 25, 2025

/test pull-cluster-api-provider-aws-e2e

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/lgtm

@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Mar 27, 2025
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/test pull-cluster-api-provider-aws-e2e-eks

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Lets also check the EKS pass

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/test pull-cluster-api-provider-aws-e2e-eks

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/retest

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@AndiDog: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name Commit Details Required Rerun command
pull-cluster-api-provider-aws-e2e-eks 635fea5 link false /test pull-cluster-api-provider-aws-e2e-eks

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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