Installation on Linux

Here are described the main steps for installing and licensing Hexaly Optimizer on your computer. Hexaly Optimizer is implemented in C++ language. The software can be used either as a standalone executable or as a callable library (C++, Java, Python, .NET). Please check that your computer meets the minimum system requirements before installing the software.

System requirements

  • Architecture: x64, arm64

  • Operating systems: Linux with libc 2.28 (or superior) and libstdc++ 6.0.25 (or superior).

  • For the C++ library: GCC 6.1 (or superior) and C++11 (or superior).

  • For the Java library: Java 8 (or superior).

  • For the .NET library: .NET 6.0 (or superior).

  • For the Python library: Python 2.7, or Python >= 3.6.


You must have administrator rights on your computer to install Hexaly Optimizer. If you haven’t done so yet, download Hexaly Optimizer for Linux from the Hexaly website.

  1. Open a terminal as root where the archive is located.

  2. Execute the following command line:

$ bash

Press enter to continue.

Choose the install location of Hexaly Optimizer and press enter to start the installation. Note that you can install different versions of Hexaly Optimizer on your system but only the last installed version will be easily accessible from the command line. To use the previous ones, you have to use their exact path (e.g. /opt/localsolver_11_5/bin/localsolver). Furthermore, you will experience troubles if you try to use the native C library without modifying environment variables such as LD_LIBRARY_PATH.


Choose the install location of Hexaly Optimizer.

If you install Hexaly Optimizer for the first time or if no license file is already present on your system, a specific page with your hardware signature will appear at the end of the installation. You will have to give us this hexadecimal number if you want to apply for a free trial license or a free academic license on our website.


Hardware signature. It is generated only if you have not specified any license.

Licensing for: Free Trial, Free Academic, Desktop or Server licenses


If you don’t have your license yet, please go to our website to register and request a free academic license or a free trial license. As licenses are manually delivered by a member of the Hexaly team, the whole procedure can take a few days to complete (usually 1 day).

You simply have to put the correct license file in the installation folder of Hexaly Optimizer. For that:

  1. Go on Hexaly website, login on your account and download your license file.

  2. Copy the file license.dat downloaded from your account in /opt/localsolver_12_5/.

Licensing for: Floating or Site licenses

This procedure applies only if you bought a floating or an academic network license. You have to setup a token server and then license each client machine as follows.

For the token server

  1. Go to your account and download the license file of the token server.

  2. Copy the file license.dat downloaded from your account in /opt/localsolver_12_5/.

  3. Open a terminal and launch the executable “lstokenserver”. Note that this program is launched in background and will keep running until the machine is shut down. You can safely close your terminal.

If you want to start automatically the token server when the machine is rebooted you have to create an init script. You can also add the following line in /etc/rc.local:


For each client machine

Create a new file and write the following line with the IP of the token server:


Save it in /opt/localsolver_12_5/license.dat.


The token server listens on TCP port 7462. Please ensure that your firewall is correctly configured to allow the trafic between the lstokenserver service and your applications.

Alternative license locations

If you want to use several licenses on the same machine, or if you have no write access to the default license location, you can specify a different license path. Hexaly will look at the following locations for a valid license file, in that order:

  1. The file the LS_LICENSE_PATH environment variable points to.

  2. In the current directory, if a file named license.dat is present.

  3. In the default location, /opt/localsolver_12_5/license.dat.

The Hexaly API provides methods to set the license path. To use it, please consult the documentation for your programming language.

License content can also be provided through a LS_LICENSE_CONTENT environment variable. This variable content will have priority over the license file.


Open a terminal in folder /opt/localsolver_12_5/ and enter the following line:

$ localsolver examples/toy/toy.lsp lsTimeLimit=1

If no error occurs, you are ready to use Hexaly Optimizer and solve your first model.

Uninstall Hexaly Optimizer

You must have root privileges on your computer to uninstall Hexaly Optimizer. Then, uninstall Hexaly Optimizer in 2 steps:

  1. Open a terminal as root and navigate to /opt/localsolver_12_5/

  2. Execute the following command line: bash