shwstppr opened a new issue #4133:
URL: https://github.com/apache/cloudstack/issues/4133
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##### ISSUE TYPE
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* Improvement Request
##### COMPONENT NAME
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##### CLOUDSTACK VERSION
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branch.
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4.14.0
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##### CONFIGURATION
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Information about the configuration if relevant, e.g. basic network,
advanced networking, etc. N/A otherwise
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##### OS / ENVIRONMENT
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N/A
##### SUMMARY
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When additional VMs are added to the k8s cluster network, cluster deletion
fails with a message, Unable to delete cluster network. k8s cluster remains in
destroying state. It gets removed once non-cluster VMs are migrated from the
cluster network. Instead of failing during deletion itself, service can
intimate user before deletion that the network is being used by other VMs and
they must be migrated before deleting.
##### STEPS TO REPRODUCE
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test-case. Use Screenshots if accurate.
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1. Create a k8s cluster without passing an existing network.
2. Create and add a new VM to this network outside of CKS
3. Delete k8s cluster
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##### EXPECTED RESULTS
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Service should throw an error before deleting k8s cluster that cluster
network is in use by VMs outside k8s cluster
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##### ACTUAL RESULTS
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Service tries to delete the k8s cluster. Node VMs are deleted. But cannot
delete the network. Error is thrown at this time. Cluster shows up in
destroying state until VMs are migrated from the network.
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