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The Access Server clustering feature uses a DNS-based round-robin system to spread the load – connections, data communications – and run a high-availability Access Server deployment.
With a high-availability, active-active cluster setup, you only need one subscription. With a single subscription purchased on our site, you can handle the licensing needs for all of the Access Server nodes in your cluster. The nodes simply share the available connections from the subscription as needed. You can adjust your subscription at any time from the Access Server portal on our site.
Find the details on our subscription here: Access Server pricing.
The benefit of providing an active-active setup is that you have more than one node running at any given time. Suppose a user connects with node one, but that node fails. The user is only disconnected briefly while their VPN client makes a new connection with node two. The nodes share configuration and subscription information so the user has the same access for a connection on any node.
Set up a new Access Server, install the latest Access Server build on it, and log on to the Admin Web UI. From there, go to Cluster and choose Join existing cluster. You will then enter the database credentials to connect and join the cluster.
If you are using an existing Access Server with users and configurations, adding it to a cluster will then wipe this node clean. It will get its user certifications and other information from the cluster instead.
Additionally, you can automate this with a command line script. For specific details, please submit a request for support.
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