Retrieving a Floating license
Retrieving a Floating license
If you are using a floating license, you will need to choose a machine to act as your Gurobi token server. This token server doles out tokens to client machines. A client will request a token from the token server when it creates a Gurobi environment, and it will return the token when it destroys that environment. The client machine can be any machine that can reach the token server over your network (including the token server itself). The client can run any supported operating system. Thus, for example, a Linux client can request tokens from a Windows token server.
Once you've chosen a machine to act as your token server, you'll need
to run the grbgetkey
command on that 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 at the bottom of the License Detail page (by following the link labeled click here for additional instructions).
The exact grbgetkey command to run for a specific license is
indicated at the bottom of the License Detail page (e.g.,
grbgetkey 253e22f3-...
). We recommend that you use copy-paste
to copy the entire grbgetkey
command from our website and paste
it into a shell window.
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:

You can store the license key file anywhere, but we strongly recommend that you accept the default location by hitting Enter. Setting up a non-default location is error-prone and a frequent source of trouble.
Setting a password for your token server
If you want to require clients of your token server to specify a
password in order to check out a token, you'll need to add one line to
your gurobi.lic
file:
PASSWORD=abcd1234You should of course choose your own password. Clients will need to place this same line in their client license files.
When adding this line to your gurobi.lic
file, please be
careful not to modify anything else in the file.
Using a non-default license file location
When you run the Linux version of the Gurobi Optimizer, it will look for the
gurobi.lic
key file in three different default locations. It
will always look in your home directory. In
addition, Gurobi Optimizer 6.5.0 will also look in
/opt/gurobi
and /opt/gurobi650
.
If you would like to use a non-default license key file
location, you can do so by setting environment variable
GRB_LICENSE_FILE
to point to the license key file. Important note: the environment variable should point to the license
key file itself, not to the directory that contains the file.
You can set an environment variable by adding a
line to your .bashrc
file:
export GRB_LICENSE_FILE=/usr/home/jones/gurobi.licFor
csh
shell users, you should add the following to
your .cshrc
file:
setenv GRB_LICENSE_FILE /usr/home/jones/gurobi.licSet the variable to point to the actual location of your license key file.
Once you have followed the steps above and have obtained a license key file, your next step is to start the token server.