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There are two types of upgrade files available:

“gl-upgrade.zip” file (~ 200 MB) (GreenLight appliance need to access docker.panagenda.com)
“gl-upgrade-offline.zip" (~ 1200 MB), (GreenLight appliance does NOT need access to docker.panagenda.com )

Procedure

Log off from the UI of GreenLight
Upload the GreenLight upgrade package (gl-upgrade.zip or gl-upgrade-offline.zip) to the appliances /tmp/ directory (using WinSCP for example)
Use ssh or putty to connect to the appliance and execute the following commands:

cd /tmp
unzip gl-upgrade.zip
./gl-upgrade.sh

or

cd /tmp
unzip gl-upgrade-offline.zip
./gl-upgrade-offline.sh

Whenever done, it takes 2-5 minutes until all Docker images are up and running again
Reload the GL UI (Browser) and Login

If the upgrade process stucks for several minutes while the system tries to stop all containers, ...

GreenLight > Upgrading GreenLight > image2020-12-16_12-23-24.png

...make sure you have closed all webbrowser connections to GL

The following screenshot shows the output during a gl-upgrade-offline update.

GreenLight > Upgrading GreenLight > image1-100.jpg