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for  CentOS Appliance only: ( smaller than  v5.0)

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.
Please note that the docker daemon version has to be between v20 and v23  (docker -v)

After yum update, GreenLight can not be started any more

Very likely the docker storage driver got updated (overlay2) by the docker daemon update. GreenLight however still uses the previous driver: overlay.

How to resolve?

If you are on GreenLight >= v4.5.7

• Modify the GL config file

...

• execute: gl customize
• Restart GreenLight

If you are on GreenLight smaller than v4.5.7

• Modify the GL config file

...