Keeping flows with hostname change?

General
2

If you specify the flow name in the command line it will always load that flow & therefore hostname is irrelevant.

>node-red --help
Node-RED v1.0.4
Usage: node-red [-v] [-?] [--settings settings.js] [--userDir DIR]
                [--port PORT] [--title TITLE] [--safe] [flows.json]

Options:
  -p, --port     PORT  port to listen on
  -s, --settings FILE  use specified settings file
      --title    TITLE process window title
  -u, --userDir  DIR   use specified user directory
  -v, --verbose        enable verbose output
      --safe           enable safe mode
  -?, --help           show this help

Documentation can be found at http://nodered.org

e.g. start node-red and specify the flow file...
node-red myflow.json

Alternatively...
Edit the settings.js file...

    // The file containing the flows. If not set, it defaults to flows_<hostname>.json
    //flowFile: 'flows.json',
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