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Preliminaries
Although X can be used remotely without SSH, it is insecure and blocked by most firewalls. SSH X forwarding fixes both these issues and also sets automatically the DISPLAY environment variable.
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Even when running with a GUI, use compute nodes for memory-intensive or cpu-intensive operations
Preparation for macOS
Current macOS operating systems do not have the X windows system. Mac users should install the XQuartz (external site) package to use SSH with X forwarding. After the installation, users may also need to indicate the path where the xauth program is. To do so, users must edit the ~/.ssh/config file and add the path under The Host * entry, as shown in listing 1.
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Running a GUI application over SSH
For Linux, macOS and Windows (MobaXterm), the user opens a local terminal window and executes ssh with the X forwarding option -X.
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Figure 1. xclock running as an example of X applications.
Improved Performance
X forwarding over SSH does not perform well over long distances. The user can try to improve performance over long distances with SSH compression. This can be activated by using the -C option in the ssh command line:
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Related pages
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