How to find Databricks runtime version of the cluster in an init script

[Mooune_DBU]

It's set as an environment variable called `DATABRICKS_RUNTIME_VERSION`

In your init scripts, you just need to add a line to display or save the info (see python example below):

import os
print("DATABRICKS_RUNTIME_VERSION:",os.environ.get('DATABRICKS_RUNTIME_VERSION',None))

[Djayashanka]

I used it databricks cluster with custom docker image. it gives that "DATABRICKS_RUNTIME_VERSION: None"