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CKS: deploy nodes of a cluster created before 4.21 from the default template by bhouse-nexthop · Pull Request #14634 · apache/cloudstack · GitHub

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CKS: deploy nodes of a cluster created before 4.21 from the default template - #14634

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CKS: deploy nodes of a cluster created before 4.21 from the default template#14634
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bhouse-nexthop commented Nov 9, 2026

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Description

A CKS cluster created before 4.21 has no control, worker or etcd node template set. The 4.21 upgrade added those columns (#9102) and left them NULL. The action workers looked the node templates up from those columns only, so scaling up such a cluster passed a null template to the VM deployment, which failed with a NullPointerException.

Fixes #14628

  • KubernetesClusterActionWorker.init(): a node type with no template of its own now uses clusterTemplate, the template CKS picks by default. That is the template these clusters deployed their nodes from before 4.21. Clusters created on 4.21 or later always have the control and worker templates set, and the etcd template whenever they have etcd nodes, so nothing changes for them.
  • isDefaultTemplateUsed(): a cluster with no control or worker template now counts as using the default template, so the owner gets launch permission for clusterTemplate while nodes are deployed, and loses it afterwards, as before 4.21. Before this change it returned false for these clusters, as none of the three columns equals template_id.

Why clusterTemplate and not the cluster's template_id: for a pre-4.21 cluster, template_id is the system VM template that was current when the cluster was created. After the upgrade that is no longer the default, and the launch permission CKS grants is for clusterTemplate. A cluster owned by a regular user could then not deploy from template_id.

Filling the columns in during the upgrade instead would be a schema change, so it would have to target main, and it wouldn't help clusters already upgraded to 4.21 or 4.22.

Types of changes

  • Breaking change (fix or feature that would cause existing functionality to change)
  • New feature (non-breaking change which adds functionality)
  • Bug fix (non-breaking change which fixes an issue)
  • Enhancement (improves an existing feature and functionality)
  • Cleanup (Code refactoring and cleanup, that may add test cases)
  • Build/CI
  • Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Bug Severity

  • BLOCKER
  • Critical
  • Major
  • Minor
  • Trivial

How Has This Been Tested?

New unit tests in KubernetesClusterActionWorkerNodeTemplateTest:

  • init() on a cluster with no node type templates sets the control, worker and etcd templates to the default template, and isDefaultTemplateUsed() is true.
  • init() on a cluster with node type templates uses them, and isDefaultTemplateUsed() is false when none of them is the cluster's template.
  • isDefaultTemplateUsed() is true when one node type uses the cluster's template.

Without the fix, the first test fails. mvn -pl plugins/integrations/kubernetes-service -am test -Dtest='KubernetesClusterActionWorker*Test' passes.

On a test environment, a cluster created on 4.20 and upgraded to 4.22 failed to scale up with the NullPointerException in #14628. Setting the node type template columns to the cluster's template_id by hand made the scale-up work. This PR itself has not been run against a live cluster.

How did you try to break this feature and the system with this change?

  • Clusters created on 4.21 or later have their node type templates set, so they take the same path as before.
  • A 4.21+ cluster with no etcd nodes has no etcd template. etcdTemplate is now the default template instead of null, but it is only used to deploy etcd nodes.
  • External-managed clusters have no templates at all. isDefaultTemplateUsed() already returned true for them, as the list of null template ids contained their null template_id.

CKS: deploy nodes of a cluster created before 4.21 from the default t…
fcdb805 
…emplate

Clusters created before 4.21 have no control, worker or etcd node
template set: those columns were added by the 4.21 upgrade and left
NULL. The action workers looked the node templates up from those
columns only, so scaling up such a cluster passed a null template to
the VM deployment, which failed with a NullPointerException.

A node type with no template of its own now uses the template CKS
picks by default, as these clusters did before 4.21. Such a cluster
also counts as using the default template, so the owner gets launch
permission for it while nodes are deployed, as before.

Signed-off-by: Brad House <bhouse@nexthop.ai>

codecov Bot commented Nov 9, 2026 •
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Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 18.32%. Comparing base (d02adcd) to head (fcdb805).

Files with missing lines Patch % Lines
...r/actionworkers/KubernetesClusterActionWorker.java 87.50% 0 Missing and 1 partial ⚠️
Additional details and impacted files 
@@            Coverage Diff            @@
##               4.22   #14634   +/-   ##
=========================================
  Coverage     18.32%   18.32%           
- Complexity    16644    16649    +5     
=========================================
  Files          5939     5939           
  Lines        537768   537773    +5     
  Branches      65929    65930    +1     
=========================================
+ Hits          98551    98570   +19     
+ Misses       428008   427993   -15     
- Partials      11209    11210    +1
Flag Coverage Δ
uitests 4.08% <ø> (ø)
unittests 19.42% <87.50%> (+<0.01%) ⬆️

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bhouse-nexthop commented Nov 9, 2026

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Test report: scaling up and upgrading a cluster created before 4.21, without the DB workaround

Summary: a CKS cluster created on 4.20 and upgraded to 4.22 and then 24.0, with its per-node-type template columns still NULL, now scales up. There's no NPE, and the new worker is deployed from the default CKS template, joins and is Ready. Launch permission for that template is granted to the owner for the scale and revoked at its end. Scaling back down, and a Kubernetes upgrade of the same cluster, also work. The template columns stay NULL throughout.

Environment

  • A CloudStack 24.0 (main) build with this PR, alongside some of my other open PRs. Among them are CKS: record a node's Kubernetes version, not the kubectl output #14635 and CKS: don't fail when a node still has an ISO attached #14637, which touch other parts of the same plugin. The management server and all three agents were upgraded in place to this build.
  • The PR targets 4.22; it wasn't run on a 4.22 build. The code it changes is the same on both branches: 4.22's KubernetesClusterActionWorker.init() reads the node templates from the per-node-type columns only, and its isDefaultTemplateUsed() only compares those columns with template_id.
  • Three KVM hosts, Ceph RBD primary storage, one management server.
  • Cluster B was created on Apache CloudStack 4.20.3.1, then upgraded to 4.22.1.1 and to 24.0. It has 1 control node and 1 worker, Kubernetes v1.33.1, and an isolated network.
  • Before the run, from kubernetes_cluster: 
    template_id  control_node_template_id  worker_node_template_id  etcd_node_template_id
3            NULL                      NULL                     NULL
    • Template 3 is the 4.20.2 system VM template that was current when the cluster was created. Both existing nodes run from it.
    • The default CKS template on this build is systemvm-kvm-4.22.0-x86_64 (id 207).
    • The DB workaround from the issue (setting the columns to template_id) was not applied. The other two pre-4.21 clusters in the lab have the same NULL columns.

Results

Step Result
scaleKubernetesCluster size=2 (1 -> 2 workers) pass, 171 s. No NPE; the new worker is deployed from template 207, joins, and is Ready
Launch permission during the scale-up pass. A row for template 207 and the owner appears 1 s after the call and is removed when the scale ends
scaleKubernetesCluster size=1 (back to 1 worker) pass, 20 s. The new worker is removed
upgradeKubernetesCluster v1.33.1 -> v1.33.13 on the same cluster pass, 334 s. Both nodes upgraded and Ready
Template columns after all of the above still NULL, unchanged

Scale-up

  • Cluster state: Running -> Scaling (3 s after the call) -> Running with size 2 (171 s).
  • The management server log for the call has 0 NullPointerException and 0 Unexpected exception lines. Without this PR, this call failed after 3 s with Cannot invoke "VirtualMachineTemplate.getUniqueName()" because "template" is null (CKS: a cluster created before 4.21 can't be scaled up after the upgrade (NullPointerException, template is null) #14628).
  • The new worker's template, compared with the existing nodes: 
    node          vm_template_id  template                     kubernetes_node_version
control-1     3               SystemVM Template (KVM)      v1.33.1\n
worker-1      3               SystemVM Template (KVM)      v1.33.1\n
worker-2      207             systemvm-kvm-4.22.0-x86_64   1.33.1      <- new
    The two old nodes' version values were written by an earlier upgrade, before CKS: record a node's Kubernetes version, not the kubectl output #14635.
  • Log, trimmed: 
    20:27:42,625 INFO  KubernetesClusterScaleWorker  Provisioned node VM: ... worker-2
20:27:50,497 INFO  KubernetesClusterScaleWorker  Attached binaries ISO for VM: ... worker-2
20:29:56,121 INFO  KubernetesClusterUtil         Kubernetes cluster cluster B has 3 ready nodes now
20:29:57,705 INFO  KubernetesClusterScaleWorker  Detached Kubernetes binaries from VM: ... worker-2
20:29:57,705 INFO  KubernetesClusterScaleWorker  Revoking launch permission for systemVM Template
  • kubectl get nodes afterwards: 
    control-1   Ready   v1.33.1
worker-1    Ready   v1.33.1
worker-2    Ready   v1.33.1     <- new

Launch permission

  • I sampled launch_permission every second during the scale-up. Only changes are shown: 
    20:27:08  [1:t3:a2 2:t3:a2 3:t3:a2]                 scale requested at 20:27:08
20:27:09  [1:t3:a2 2:t3:a2 3:t3:a2 21:t207:a2]      granted: template 207, the owner's account
20:29:58  [1:t3:a2 2:t3:a2 3:t3:a2]                 revoked, right after the "Revoking" log line
  • The three rows for template 3 were there before the run and are left as they were. The revoke only removes rows for the default template.
  • Before this PR, isDefaultTemplateUsed() was false for this cluster, so nothing would have been granted or revoked.

Scale-down and upgrade

Result: pass. A pre-4.21 cluster with NULL node-type template columns scales up, down and upgrades without the workaround. New nodes come from the default CKS template, and the owner holds launch permission for it only while the scale runs.

Not covered

  • A cluster owned by a regular user. All three pre-4.21 clusters in the lab are owned by the root admin account, which can deploy from any template. So the run shows that the permission is granted and revoked at the right times, but not that a regular user's scale-up depends on it. A cluster created now can't stand in for this case, since it has its node-type templates set, so I didn't try to fake one in the DB.
  • A pre-4.21 cluster with etcd nodes: these clusters had none before 4.21.
  • After the scale-up, the cluster mixes nodes from template 3 and template 207. That is the expected effect of deploying new nodes from the default template; the new node joined without problems. Whether operators want the old nodes moved to the new template is outside this PR.

This was referenced Nov 9, 2026
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DaanHoogland added this to the 4.22.3 milestone Nov 11, 2026
DaanHoogland linked an issue Nov 11, 2026 that may be closed by this pull request
CKS: a cluster created before 4.21 can't be scaled up after the upgrade (NullPointerException, template is null) #14628
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CKS: a cluster created before 4.21 can't be scaled up after the upgrade (NullPointerException, template is null)

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