ExitRelay 0
and/or
ExitPolicy reject *:*

to prevent being an exit.

I don't know that you can prevent yourself from getting the Guard flag
and being a guard.

https://www.torproject.org/docs/tor-manual.html.en
https://www.torproject.org/docs/tor-relay-debian.html.en

Matt

On 9/16/16 10:22, Jim Electro House wrote:
> Hi to all!
> I'm running a non-exit relay and I'd like to configure it to run *only* as
> a middle relay. Do you know which conf should I add on my torrc file?
>
>
>

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