Click Devices > Access Gateways > New Cluster.
Specify the following details:
Cluster Name: Specify a display name for the cluster.
Type: Select the type of cluster you want to create: Gateway Appliance or Gateway Service.
Primary Cluster Server: Select the server that is to be the primary server in the cluster.
In the Server Name list, select the servers that you want to be members of the cluster.
You can create a cluster of one, and add additional servers later. You cannot create a cluster that contains Access Gateway Appliances and Access Gateway Services. The cluster can contain only one type of Access Gateway.
Each server you add to the cluster adds about 30 seconds to the time it takes to configure the cluster because certificates must be synchronized and configuration options must be sent to that server. If you create a very large cluster of twenty servers, it can take up to ten minutes to configure and create the cluster.
Click OK.
After the cluster has been created, each server in the cluster needs be restarted. On the Access Gateways page, click Update All by the name of the cluster.
(Conditional) If Access Gateways in the cluster have multiple network adapters or IP addresses, you need to configure the listening address for each reverse proxy.
When you create the cluster configuration for newly added servers, the listening address is always the IP address of eth0. If this is not the address where you want the reverse proxy to listen for requests, click Access Gateways > Edit > [Name of Reverse Proxy], select Access Gateway as the Cluster Member, then enable the Listening Address you want to use.
To configure the cluster, click Access Gateways > Edit.
A cluster of Access Gateways has the same configuration options as a single Access Gateway. The only difference is that for some options you need to select Access Gateway to configure. For example, the Date & Time option allows you to set the time separately for each member of the cluster.
Applying the configuration to a cluster is slightly different. You have the option to apply the changes to all servers in the cluster by selecting the Update All option, or to apply them to one server at a time by selecting the Update option for each server. When you update the servers one at time, your site remains up. For more information about the Update and Update All options, see Status Options.
If you prefer to apply changes to the servers one at time, you must save the changes to the configuration datastore on the Server Configuration page. (The OK buttons on the other configuration pages save the changes to browser cache.) If your session times out before you update all servers in the cluster and the changes have been saved only in browser cache, the changes are lost and are not applied to the servers that are still in an Update status.