MATLAB: Can I configure MATLAB to utilize multiple licenses from multiple license servers

2concurrentlicensesMATLABmultipleservers

Is it possible to allow a client machine to connect to a second MATLAB server if the first server does not have any MATLAB keys available?

Best Answer

While this configuration is possible, you will not be able to configure MATLAB to pull toolboxes from two license servers at the same time. Setting this configuration will only allow MATLAB to fail over to a second server if the first server is down or there are no MATLAB license keys available. Once MATLAB has connected to a network license manager, it remains locked to that license manager until the session has ended.

To enable this configuration, follow the instructions below:

1) Create an environment variable, MLM_LICENSE_FILE, and set it to the port@host of the server machines in order. For example:

MLM_LICENSE_FILE=port@hostname1;port@hostname2

Alternatively, you can Edit the MATLAB shortcut icon so the target path reads:

C:\...\matlab.exe -c port@hostname1;port@hostname2

NOTE: If you are running an R13 client or below, you will not be able to run the license manager in the port range 27000-27009. To allow this failover, you will need to set the port number for the license manager to a range such as 1700-1711.

Also, a colon should be used rather than a semicolon on Non-Windows (Unix) systems.

For MATLAB Parallel Server, worker licenses can be split up between two license server systems since each worker license is a seperate MATLAB Parallel Server session.

NOTE: Starting in R2019a the following name changes occurred:

MATLAB Distributed Computing Server was renamed to MATLAB Parallel Server
mdce_def was renamed to mjs_def
mdce binary was renamed to mjs

Related Solutions

MATLAB: How to install the Network License Manager

To Install the Network License Manager, you must first activate and obtain the license file then install the license manager software using the MathWorks Installer or manually install using the license manager binaries.

The following instructions are for:

Activating the network license and obtaining the license file
Installing the license manager with the MathWorks Installer for R2020a and newer
Installing the license manager with the MathWorks Installer for R2019b and older
Manually installing the license manager using the binaries
Installing MATLAB on client machines
Controlling access to your MATLAB license

Activate the network license and obtain the license file (Required)

To install the network license manager, the license server must first be activated on the MathWorks website to obtain the license file. For R2019b or earlier, you will also require the File Installation Key.

To generate a license file and the File Installation Key:

Open the license in the License Center
Click the "Install and Activate" tab
Click "Activate to Retrieve License File" (If you see "Activated Servers" instead, skip ahead.)
Enter the release, operating system, host ID and activation label (What is my host ID?)
Click "Download license file" or "Email license file"
Copy the File Installation Key (For R2019b and earlier)

If you see a screen called "Activated Servers" when you click the "Install and Activate" tab then your server is already active. For information on updating you License Manager, please refer to the following article:

How do I update the Network License Manager?

Once you obtain the license file, and the file installation key for R2019b and earlier, you may proceed to the following instructions for installing the license manager using the MathWorks Installer or installing the license manager manually using the license manager binaries,

(R2020a and later) Installing the license manager with the MathWorks installer

The license manager installer is part of the MATLAB installer. The MathWorks Installer can be downloaded here. Once you have the installer:

Start the MATLAB installer.
Click 'Advanced Options' at the top right.
Select 'I want to install Network License Manager'
Accept the terms of the Software License Agreement.
When prompted for a license file, browse to the "license.lic" file that you downloaded from the MathWorks License Center.
Select the destination folder
To start the license manager to start at boot time, select "Configure the license manager as a service" (Windows only.)
Click "Begin Install."
Start the license manager

(R2019b and earlier) Installing the license manager with the MathWorks installer

As with the newer MathWorks Installer, the license manager is part of the Installer. The MathWorks Installer can be downloaded here. Once you have the installer:

Start the MATLAB installer.
Select "Use a File Installation Key"
Accept the terms of the MATLAB Software License Agreement.
Enter your File Installation Key.
Confirm the installation path
Select the "License Manager" from the list of products to install.
Uncheck other products unless you also want to install the MATLAB client software on this machine. Use the checkbox at the top of the list to select or deselect all products.
When prompted for a license file, browse to the "license.lic" file that you downloaded from the MathWorks License Center.
To start the license manager to start at boot time, select "Configure the license manager as a service" (Windows only.)
Click "Install."
Start the license manager

Manually installing the license manager using the binaries

If you are serving multiple vendors from your FlexLM server, or you simply prefer to do things manually, the license manager can be updated without using the MATLAB installer. This is only recommended for experienced license administrators.

The license manager binaries can be downloaded here:License Manager Download

The license manager consists of four binaries:

lmgrd, the core license manager binary
mlm, the MATLAB vendor daemon
lmutil, a suite of tools for administering the license manager
lmtools.exe, a graphical frontend for the license manager. (Windows only.)

To install the license manager manually:

Extract the downloaded folder and place the folder in the desired destination
Place the license.lic into the /etc folder.
Edit the license.lic to include the SERVER and DAEMON lines then rename it to license.dat
Create a text file to use as the debug log (lmlog.txt)
Start the license manager

For information on adding the SERVER and DAEMON lines, please refer to the following article:

Why do I receive License Manager Error -13?

NOTE: When installing the license manager manually on Windows, the network license manager service will not be configured in lmtools.exe automatically. You will need to configure the service manually .

Installing MATLAB on client machines

You will need a copy of the license.dat file to install MATLAB or other MathWorks products on client machines. This file is inside the license manager installation folder:

Open the folder where the license manager is installed.
Open the folder "etc."
Create a copy of the file "license.dat." Do not remove the file from this directory.

For more information on installing MATLAB and other MathWorks products on client machines, please see the following article:

How do I install a MATLAB client for a network license?

Controlling access to your MATLAB license

If you have a Network Named User license, or you would like to restrict access to products on your license, you will need to use an options file.

To create an options file, please see the instructions in the following article:

Is there a way to administer FLEXnet based licenses? How do I create an Options file?

If you receive any errors while updating the License Manager, please visit our support page or contact us with the license.dat, debug log (lmlog), and options file (if you have one) attached.

MATLAB: If I change the hostname of the license server, what changes will I have to make to the server and client installations

If you change the hostname of the license server, you will not need to generate a new license file, but you may need to update the SERVER line in the existing client and server license files, or environment variables. The license file is locked to either the MAC address or IP address of the server, so it is not necessary to activate and generate a new license file.

The second entry in the SERVER line of the license file identifies the license server by hostname or IP address. Any license file that references the hostname must be updated to the new hostname. Similarly, any client that uses the "LM_LICENSE_FILE" (or "MLM_LICENSE_FILE") environment variable with the "port@hostname" notation must be updated to use the new hostname.

For instructions on how to update the client license file, see the Related Solution listed below.

Best Answer

Related Solutions

MATLAB: How to install the Network License Manager

MATLAB: If I change the hostname of the license server, what changes will I have to make to the server and client installations

Related Question