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Expand section about cluster controllers

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Catherine Luse
2019-12-11 14:18:14 -07:00
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content/rancher/v2.x/en/overview/architecture/_index.md
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@@ -77,15 +77,15 @@ By default, Rancher generates a [kubeconfig file]({{<baseurl>}}/rancher/v2.x/en/
Each downstream user cluster has a cluster agent, which opens a tunnel to the corresponding cluster controller within the Rancher server.
There is one cluster controller and one cluster agent for each downstream cluster.
By default, to enable Rancher to communicate with a downstream cluster, the cluster controller connects to the cluster agent. If the cluster agent is not available, the cluster controller can connect to a [node agent](#3-node-agents) instead.
The cluster controller is a component of the Rancher server performs the following tasks:
There is one cluster controller and one cluster agent for each downstream cluster. Each cluster controller:
- Watches for resource changes in the downstream cluster
- Brings the current state of the downstream cluster to the desired state
- Configures access control policies to clusters and projects
- Provisions clusters by calling the required Docker machine drivers and Kubernetes engines, such as RKE and GKE
By default, to enable Rancher to communicate with a downstream cluster, the cluster controller connects to the cluster agent. If the cluster agent is not available, the cluster controller can connect to a [node agent](#3-node-agents) instead.
The cluster agent, also called `cattle-cluster-agent`, is a component that runs in a downstream user cluster. It performs the following tasks:
- Connects to the Kubernetes API of Rancher-launched Kubernetes clusters