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title: Managing Cluster
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product: Hybrid Standalone Runtimes
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# Managing Cluster

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

Managing clusters involves coordinating multiple Mule runtime instances working together to provide
high availability and load distribution.

## Add Servers to a Cluster

Add individual servers to an existing cluster to increase processing capacity and enhance high
availability across your deployment infrastructure.

Make sure that you follow these requirements:

- The target cluster already exists.

- At least one server is configured and available.

- All servers being added must run identical versions of:

  - Mule runtime

  - Runtime Manager agent

  - Java

> [!IMPORTANT] Adding servers to a unicast cluster triggers an automatic restart of all existing
> servers in the cluster. Plan cluster modifications during maintenance windows to minimize service
> disruption.

To add servers to a cluster:

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

2.  Select **Servers**.

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

    ![Add Server button](/mulesoft/current/en-us/hybrid-standalone/_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.

You can remove a server from a cluster without changing the server or cluster.

## Remove Servers from a Cluster

Remove servers from a cluster to reduce processing capacity, perform maintenance, or reallocate
servers to other deployment configurations.

> [!IMPORTANT] When you remove a server from a unicast cluster, all existing servers in the cluster
> restart.

To remove a server from a cluster:

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

2.  Select **Servers**.

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

4.  Click the **X** icon to remove the server from the cluster:

    ![X icon](/mulesoft/current/en-us/hybrid-standalone/_images/rtm-remove-server-from-cluster.png)

    Figure 2. The arrow shows the **X** icon in the details pane.

5.  In the **Remove** confirmation window, select the checkbox to verify that you want to remove the
    server from the cluster, and then click the **Remove** button.

## Delete Clusters

When deleting a cluster, consider this:

- Alert definitions and history for the cluster are deleted.

- Servers assigned to the cluster are not deleted.

- Servers assigned to the cluster restart.

- Applications deployed to the servers in the cluster are removed.

To delete a cluster:

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

2.  Select **Servers**.

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

4.  Click the cluster status and select **Delete** from the menu:

    ![Delete option](/mulesoft/current/en-us/hybrid-standalone/_images/rtm-cluster-delete.png)

    Figure 3. The arrow shows the **Delete** option in the details pane.

5.  In the confirmation window, select the checkbox to verify that you want to delete the cluster,
    then click **Delete Cluster**.

The servers in the deleted cluster restart.

## See Also

- [Creating Clusters](https://docs.mulesoft.com/hybrid-standalone/creating-clusters)

- [Managing Servers](https://docs.mulesoft.com/hybrid-standalone/managing-servers)

- [Monitoring Hybrid Standalone Instances](https://docs.mulesoft.com/hybrid-standalone/monitoring-hybrid-standalone)

- [Deploying Mule Apps to Hybrid Standalone Instances](https://docs.mulesoft.com/hybrid-standalone/deploying-apps-hybrid-standalone)