Retrieving a Compute Server license

If you have purchased one or more Gurobi Compute Server licenses, you'll need to perform a few setup steps in order to start your Compute Servers. Once started, client machines will be able to offload the work of solving an optimization model onto these servers. The clients and the Compute Servers can run any mix of supported operating systems. Thus, for example, multiple Linux machines could submit jobs to a pair of Compute Servers, one running Windows and the other running Linux. Any machine that can reach the Compute Server(s) over your network can be a client (including the Compute Servers themselves).

Once you've chosen a machine to act as a Compute Server (or a node in a Compute Server cluster), you'll need to run the grbgetkey command on your machine to retrieve your Gurobi license key. Note that the machine must be connected to the Internet in order to run this command. An Internet connection is not required after you have obtained your license key.

If your computer isn't connected to the Internet or if your network security system does not allow the command below to function, we also offer a manual license key process. You'll find manual instructions after clicking the Install button in the Gurobi User Portal next to a license at the bottom left (Generate Manually).

The exact command to run for a specific license is indicated when clicking the Install button for a license in the Gurobi User Portal (e.g., grbgetkey 253e22f3-...). We recommend that you use copy-paste to copy the entire grbgetkey command from our website and paste it directly into the Windows Search box (and then hit Enter):

If you are unfamiliar with running command-line commands on a Windows system, you can learn more here.

The grbgetkey program passes identifying information about your machine back to our website, and the website responds with your license key. Once this exchange has occurred, grbgetkey will ask for the name of the directory in which to store your license key file (gurobi.lic). You should see a prompt that looks like this:

Gurobi license key client (version 10.0.3)
Copyright (c) 2023, Gurobi Optimization, LLC

Contacting Gurobi key server...

Key for license ID 146542 was successfully retrieved.

Saving license key...

In which folder would you like to store the Gurobi license key file?
[hit Enter to store it in c:\gurobi]:

–> License key saved to file 'c:\gurobi\gurobi.lic'.

You can store the license key file anywhere, but we strongly recommend that you accept the default location (either your home directory or c:\gurobi) by hitting Enter. Setting up a non-default location is error-prone and a frequent source of trouble.

Using a non-default license file location

When you run the Windows version of the Gurobi Optimizer, it will look for the gurobi.lic key file in three different default locations: c:\gurobi, c:\gurobi1003 (for Gurobi 10.0.3), and your home directory. Note that these default paths are absolute, so for example Gurobi will look for the license key file in c:\gurobi, even if the software is installed in d:\gurobi. Note that the token server won't look for the license file in your home directory (it runs under username LocalService, so it doesn't have access to your home directory). If you would like to use a non-default license key file location, you can do so by setting a system environment variable GRB_LICENSE_FILE to point to the license key file. See Setting environment variables for details on how to do this.

Important note: the environment variable should point to the license key file itself, not to the directory that contains the file.

Once you have followed the steps above and have obtained a license key file, your next step is to start Gurobi Remote Services.

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