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-rw-r--r--doc/user/project/clusters/index.md7
1 files changed, 7 insertions, 0 deletions
diff --git a/doc/user/project/clusters/index.md b/doc/user/project/clusters/index.md
index 377e285a731..baa6efe50d5 100644
--- a/doc/user/project/clusters/index.md
+++ b/doc/user/project/clusters/index.md
@@ -153,6 +153,13 @@ GitLab provides a one-click install for various applications which will be
added directly to your configured cluster. Those applications are needed for
[Review Apps](../../../ci/review_apps/index.md) and [deployments](../../../ci/environments.md).
+NOTE: **Note:**
+The applications will be installed in a dedicated namespace called
+`gitlab-managed-apps`. In case you have added an existing Kubernetes cluster
+with Tiller already installed, you should be careful as GitLab cannot
+detect it. By installing it via the applications will result into having it
+twice, which can lead to confusion during deployments.
+
| Application | GitLab version | Description |
| ----------- | :------------: | ----------- |
| [Helm Tiller](https://docs.helm.sh/) | 10.2+ | Helm is a package manager for Kubernetes and is required to install all the other applications. It is installed in its own pod inside the cluster which can run the `helm` CLI in a safe environment. |