// Module included in the following assemblies:
//
// * etcd/KMS_v2/index.adoc

:_mod-docs-content-type: REFERENCE
[id="kms-technology-preview-phases_{context}"]
= KMS Technology Preview limitations

[role="_abstract"]
Review the current limitations of {KMS} to plan deployments and avoid unsupported configurations in {product-title} 4.21 or later.

[id="kms-current-limitations_{context}"]
== Current limitations

* Plugins require manual installation on each control plane node
* Plugins must listen at `unix:///var/run/kmsplugin/kms.sock`
* Only one KMS plugin can run at a time
* KMS-to-KMS migration requires intermediate migration to `identity` or `aescbc`
