Caché System Administration Guide - InterSystems Documentation

Managing Caché Licensing
license servers. License servers can run on any computer where you run a Caché instance. A monitor
process sends update messages to the license server, which coordinates license allocation when more
than one instance shares a license.
The license server coordinates the views of license use maintained locally in every instance. The license
server is not a Caché process; it is unaffected if a Caché instance shuts down. One license server can
handle multiple instances. Therefore, you need at most one per host regardless of how many Caché
instances run on a host. However, each Caché instance must have a local copy of the authorizing license
key file installed.
If you run Caché servers on multiple hosts, you can configure more than one license server to provide
redundancy. The license software selects one of the license servers to be the active server. The other
servers are available to take over should the active server fail. This is much less critical than with
previous Caché releases because the instance can continue running with users logging in and out in
the absence of the license server, and the license server continues running after shutdown when it is
supporting more than one instance. When configuring license servers, decide which server or servers
you want to host the license server. You can configure it to run on as many hosts as you want, but
more than three is excessive. Since the license server is started by a running instance, it should be
configured to run on systems where you expect a Caché instance to be running consistently.
Multiple instances with different license keys and running on different platforms can use the same
license server to coordinate licensing as long as each instance has its own copy of the proper cache.key
file and all instances authorized by the same key use the same license servers. However license units
are not summed across license keys. Cache instances using different license keys do not share license
units, and users logged into two instances using different license keys will consume a separate license
unit from each key.
4.1.1 Configure License Servers
Configure the license servers using the System Management Portal:
1. Navigate to the [Home] > [Licensing] > [License Server] page.
2. This displays a list of license servers configured for this installation. From this page you can edit
or delete an existing server definition or add a new server.
3. Click Add to configure a license server.
4. Enter a name for the license server in the Name box, the IP address of the host on which it runs
in the Hostname/IP Address box, and the UDP port number used by the license server in the Port
box.
Note:
The name identifies the license server in the configuration and must be unique to a
configuration.
A license server is defined by the IP address of the host on which it runs and the UDP port it uses
to communicate. You can enter the IP address in dotted decimal format (192.29.233.19) or
54 Caché System Administration Guide