You can stop and restart your JupyterLab Docker container at any time via the JupyterHub. Here are the steps:
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Switch to the hub: Click on “File” in the top menu bar and then on “Hub Control Panel”. The JupyterHub will now open in a new browser window/tab.
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Stop the server: Click on the red “Stop My Server” button.
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Start the server: Click on the blue “Start My Server” button.