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The status bar at the bottom of Jupyter lab does not show
...|Idle [Running]or...|Idle [Running(Spark)]-
Check whether the cluster is running.
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Check whether VPN is running, if necessary to connect to port 2200 of the cluster.
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Check whether you can access the cluster from the command line.
(db-jlab)$ ssh $CLUSTER_ID
If this all is working successfully, then most probably the Jupyter kenrel mechnnism is out of sync. => Solution: Fully shut down the kernel in Jupyter and select the kernel again. This will execute all prerequisite checks and confgurations and the notebook should connect succesfully again.
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The notebook does not work after kernel restart
Somtimes Jupyter fails to kill the remote kernel and the Jupyter kernel mechanism gets out of sync. => Solution: Fully shut down the kernel in Jupyter and select the kernel again. This will execute all prerequisite checks and confgurations and the notebook should connect succesfully again.