Adding Master/Client Nodes

Prerequisites

The target cluster is available and has no tasks in progress.

Constraints

• If a cluster already has master and client nodes, the Add Master/Client Node tab is not displayed on the Modify Configuration page. In this case, you need to add the master or client nodes by referring to Scaling Out a Cluster.
• When you add master or client nodes, the number of nodes that can be configured varies depending on the node type. For details, see Table 1.

  Table 1 Number of nodes in different types

  Node Flavor	Number
  Master node	An odd number ranging from 3 to 9
  Client node	1 to 32

Procedure

1. Log in to the CSS management console.
2. In the navigation pane on the left, choose Clusters > Elasticsearch. On the displayed Clusters page, locate the target cluster and choose More > Modify Configuration in the Operation column.
3. On the Modify Configuration page, choose the Add Master/Client Node tab.
4. Select the target node type and set the node specifications, quantity, and storage.
   • Master and client nodes cannot be added at the same time.
   • If a cluster already has a master or client node, you can only add nodes of the other type.
   Figure 1 Adding a master or client node
   
5. Click Next: Scale Now.
6. Confirm the information and click Submit.

   Return to the cluster list page. The Task Status of the cluster is Scaling out.

   • If you added a master node and Cluster Status changed to Available, the master node has been successfully added.
     

     If the cluster version is earlier than 7.x, when the Cluster Status changes to Available, you need to restart all data nodes and cold data nodes in the cluster to make the new node take effect. Before the restart, the cluster may be unavailable. For details, see Restarting a Cluster.

   • If you added a client node and Cluster Status changed to Available, the client node has been added. You can restart data nodes and cold data nodes to shut down Cerebro and Kibana processes on the nodes.