SA-250 Server Installation Guide
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6. Set Up and Manage Server Cluster
A server cluster is an interconnected group of servers. A server cluster comprises a parent server and one or
more child servers.
A server cluster is created to manage multiple servers using a single server. This managing server is called the
parent server and the servers that are managed from the parent server are called the child servers. The parent
server retrieves aggregated data from multiple child servers in the cluster and displays it on the AirTight
Management Console along with the parent server data. You can also push common policies onto multiple child
servers from a parent server.
A server (parent server or child server) can be a part of only one cluster at any given point. A child server cannot
be the parent of any other server in the cluster.
The creation of a server cluster and management of servers in the server cluster is done using the server
command line console. Viewing of the aggregated server cluster data and management of policies on the child
servers from the parent server in the cluster is done through AirTight Management Console.
Following are the prerequisites to create a server cluster.
•
The AirTight Wi-Fi/AirTight WIPS servers that form a cluster must have the same version and build
number.
•
A valid license must have been applied to all child servers to be added to the server cluster.
•
The child server must not be a part of any other server cluster.
You can perform five cluster-related operations from the server command line console. They are as follows.
1. Set up a server cluster/assign parent server to a server cluster.
2. Add a child server to a server cluster.
3. Delete or remove a child server from a server cluster.
4. Delete an entire server cluster.
5. Check the status of servers in a cluster or check if a server is part of a cluster.
The servers in a server cluster are assigned IDs when they become a part of the server cluster. A parent server is
assigned 1 as ID in the cluster. As and when the child servers are added, they are assigned sequentially
incrementing IDs. The child server added first is assigned 2 as ID, the next one is assigned 3 as ID and so on.
After creating the cluster, you must mount the child servers on the parent server location tree, to be able to view
aggregated server data on the UI or push policies from parent server to child server. For details, refer to the
AirTight Management Console User Guide.
Set Up Server Cluster
You can set up a cluster comprising one parent and multiple child servers through the server command line
interface. The
cluster set
command is used to set up a cluster. This command must be executed on the
command line interface of the server that you want to assign as the parent server in the server cluster.
You can optionally choose to run the server cluster setup wizard to add child servers to the server cluster.
You can check the status of the server by executing the
cluster show status
command.
Note
: If a parent server or child server is in HA mode, the active server is added to the server cluster. The
standby HA server cannot be added to the server cluster. Before setting up a server cluster, a parent server or a
child server can be in Standalone mode or in HA pair configuration with other servers. Once the server cluster is
set up, HA mode can be enabled at a later point on the parent server or the child server, if required.
