Is there a way to change the default port (6006) on TensorBoard so we could open multiple TensorBoards? Maybe an option like --port="8008"?
By default Tensorboard attaches to localhost and port 6006 (unless the port is already taken, in which case it will try 6007 , 6008 , etc.).
Start TensorBoard through the command line or within a notebook experience. The two interfaces are generally the same. In notebooks, use the %tensorboard line magic. On the command line, run the same command without "%".
In fact there is an option to change the default port ...
tensorboard --logdir=/tmp  --port=8008 
                        You should provide a port flag (--port=6007). 
But I am here to explain how you can find it and other flags without any documentation. Almost all command line tools have a flag -h or --help which shows all possible flags this tool allows.
By running it you will see information about a port flag and that --logdir allows you to 
also pass a comma separated list of log directories
and you can also inspect separate event-files and tags with --event_file and --tag flags
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