Customers have full root access on the appliance and can therefore execute OS/Security updates at any point in time. During these yum updates/upgrades it may happen that  GreenLight (built on docker) can not be successfully started up anymore because of the changes.

This article explains several cases which you can use in order to resolve your problem

After yum update, GreenLight can not be started any more

Likely the docker storage driver got updated (overlay2) with the docker daemon update however the GreenLigth application still sticks to previous driver: overlay.

How to resolve?

If you are on GreenLight >= v4.5.7

• Modify the GL config file

vim /opt/panagenda/appdata/gl/config

## Add the following line
PANAGENDA_DOCKER_STORAGE_DRIVER=overlay2

• execute: gl customize
• Restart GreenLight

If you are on GreenLight <v4.5.7

• • Modify the GL config file

  vim /opt/panagenda/appdata/gl/config ## Add the following line PANAGENDA_DOCKER_STORAGE_DRIVER=overlay2

• Run the GreenLight Upgrade to minimum v4.5.7  (./gl-upgrade-offline.sh)
• Restart GreenLight