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title: Add Servers to a Cluster
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# Add Servers to a Cluster

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

[![logo hybrid active](/mulesoft/current/en-us/_/img/icons/hybrid-cloud.svg "Hybrid")Hybrid](deployment-strategies#hybrid-deployments)[ ![logo server active](/mulesoft/current/en-us/_/img/icons/server-cloud.svg "Anypoint Platform PCE")Private Cloud Edition](deployment-strategies#anypoint-platform-private-cloud-edition)

All servers that you add to a cluster must run on the same versions of:

- Mule runtime

- Runtime Manager agent

- Java

> [!IMPORTANT] When you add a server to a unicast cluster, all existing servers in the cluster are
> restarted.

## Prerequisites

- At least one server is configured.

- The cluster is created.

## Add Servers to a Cluster

1.  From Anypoint Platform, select **Runtime Manager**.

2.  Select **Servers** in the left menu.

3.  Click **Cluster** in the **Type** column to display the details pane:

    ![Add Server button](/mulesoft/current/en-us/runtime-manager/_images/rtm-cluster-add-server-to-cluster.png)

    Figure 1. The arrow shows the **Add Server** button in the details pane.

4.  Click **Add Server**.

    Servers that are already in a server group or cluster don’t appear in the list of available
    servers.

5.  In the list, select the servers to add to the cluster, and click **Add Servers**.

The servers no longer appear in the **Servers** list. To see the list of servers in the cluster,
click the cluster name.

## See Also

- [Multicast vs Unicast Clusters](https://docs.mulesoft.com/runtime-manager/cluster-about#multicast-vs-unicast-clusters)

- [Add Servers to Runtime Manager](https://docs.mulesoft.com/runtime-manager/servers-create)