Product Documentation

Setting up a Cluster of NetScaler Instances

Nov 23, 2017

After provisioning NetScaler instances on one or more NetScaler SDX appliances, you can create a cluster of NetScaler instances. The nodes of the cluster can be NetScaler instances on the same SDX appliance or on other SDX appliances that are available on the same subnet.

Note:
  • To set up a cluster, you must understand NetScaler clustering. For more information, see Clustering.
  • For clusters that have NetScaler instances across SDX appliances, Citrix recommends that you use NetScaler instances from three SDX appliances. This ensures that the cluster criteria of a minimum of (n/2 +1) nodes is always satisfied.
Figure 1. Cluster of SDX NetScaler instances
The above figure shows three SDX appliances, SDX1, SDX2, and SDX3, on the same subnet. The NetScaler instances on these appliances are used to form two clusters: Cluster1 and Cluster2.
  • Cluster1 includes two instances on SDX1.
  • Cluster2 includes one instance on SDX1, two instances on SDX2, and another two instances on SDX3.
Points to remember
  • All nodes of a cluster must be of the same type. You cannot form a cluster of hardware and virtual appliances, nor a cluster of VPX NetScaler instances and SDX NetScaler instances.
  • The NetScaler instances must be of the same version, which must be version 10.1 or later.
  • The NetScaler instances must all have the same feature license.
  • No configurations can be updated on individual NetScaler instances after they are added to the cluster. All changes must be performed through the cluster IP address.
  • The NetScaler instances must all have the same resources (memory, CPU, interfaces, and so on).

To set up a NetScaler cluster on an SDX appliance

  1. Log on to the SDX appliance.
  2. On the Configuration tab, navigate to NetScaler, and then click Clusters.
  3. Create the cluster:
    1. Click Create Cluster.
    2. In the Create Cluster dialog box, set the parameters required for the cluster. For a description of a parameter, hover the mouse cursor over the corresponding field.
    3. Click Next to view the configuration summary.
    4. Click Finish to create the cluster.
      Note: When a NetScaler instance that is provisioned on the NetScaler SDX appliance has L2 VLAN configured, and if that node is added to the cluster, then the add vlan command is saved with the sdxvlan parameter set to Yes. This parameter is an internal argument and is used to avoid loss of connectivity during SDX cluster formation.
  4. Add nodes to the cluster:
    1. Click Add Node.
    2. In the Add Node dialog box, configure the parameters required for adding a cluster node. For a description of a parameter, hover the mouse cursor over the corresponding field.
    3. Click Next to view the configuration summary.
    4. Click Finish to add the node to the cluster.
    5. Repeat steps a through d to add another node to the cluster.

    After creating the cluster, you must configure it by accessing it through the cluster IP address.

    Note: To get an updated list of NetScaler clusters, each of which has at least one NetScaler instance of the SDX appliance, use the Rediscover option.

To add a NetScaler instance that exists on one SDX appliance to a cluster configured on another SDX appliance

  1. Log on to the SDX appliance from which you want to add the NetScaler instance.
  2. On the Configuration tab, navigate to NetScaler, and then click Clusters.
  3. Click Add Node.
  4. In the Add Node dialog box, configure the parameters required for adding a cluster node. For a description of a parameter, hover the mouse cursor over the corresponding field.
    Note: Make sure the values of the Cluster IP address and Cluster IP Password parameters are for the cluster to which you want to add the node.
  5. Click Next to view the configuration summary.
  6. Click Finish to add the node to the cluster.