support configurable start port instead of a magic number 9000

[amunger]

Discussed in https://github.com/microsoft/vscode-jupyter/discussions/10761

^{Originally posted by ladyrick July 11, 2022} KernelLauncher.computeStartPort support different start port instead of a magic number 9000: https://github.dev/microsoft/vscode-jupyter/blob/be3667521cf217753b343c7483c128b34dd5d213/src/kernels/raw/launcher/kernelLauncher.node.ts#L99

In my case, I need port 9000-10000 to be reserved. These ports may be not used now but may be used in the future. Now jupyter uses 9000 as start port. It's very likely to occupy a port in 9000-10000 and later my other application would failed because of "port is already in use".

[rchiodo]

Should be relatively simple to add a setting with it defaulting to 9000.

[RafalSkolasinski]

Yes, please. I use 9000 for other applications and would like to specify the vscode-jupyter to use port from some other range.

[RafalSkolasinski]

Is there any way to configure this currently? It often clashes with my other dev services I work on.

[DonJayamanne]

@RafalSkolasinski unfortunately no. If at all possible, please feel free to submit a PR.

[DonJayamanne]

This issue has been open for a while and there haven't been any PRs even though its been marked as good first issue

[CarlosDomingues]

Could this issue be reopened? I'd like to give it a try.