[tor-relays] Multiple relay instances, debian + systemd

[Paw Møller]

Dear all,

I run an exit node on debian strech,
fingerprint 13E75F70220903A68BAF1F80B3DA9AB913961841
I would like to use more bandwidth, but I'm unsure how to do that with
systemd.

So, Lets say I want two exit nodes, each at 20MB/s.
As per
https://www.torservers.net/wiki/setup/server#high_bandwidth_tweaks_100_mbps,
I am supposed to use
tor-instance-create tor{1,2} [1]
systemctl enable tor at tor1
etc.

but what goes in the individual tor at tor1 torrc
in /etc/tor/instances/tor1/torrc and what goes in the main instance in
/etc/tor/torrc?

Looking at the status for the new instance
systemctl status tor at tor1
Process: 22722 ExecStartPre=/usr/bin/tor --defaults-torrc
/var/run/tor-instances/tor1.defaults -f /etc/tor/instances/tor1/torrc
--verify-config

it seems the main torrc is not read, so maybe this is just an fancy way of
doing the "old"
/usr/sbin/tor -f /usr/local/etc/torrc1
/usr/sbin/tor -f /usr/local/etc/torrc2
...
with separate configurationfiles and datadir?


I have a few extra ipv4 addresses. Should I allow each instance it's own IP
or is sharing fine with one having (80,443) and the other (9091,9030) as
(QR,DIR)port?
I am aware that one IP can only be shared between two instances.


Another question:
Should I set the NumCPUs option to 2 or just leave it at 0(default)?
https://www.torproject.org/docs/tor-manual.html.en#NumCPUs

The processor is a bit old:
Model name:            Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz
pidstat 5 -p `pidof tor`
Linux 4.9.0-3-amd64 (tiger) 2017-07-01 _x86_64_ (4 CPU)
23:38:33      UID       PID    %usr %system  %guest    %CPU   CPU  Command
23:38:38      127     10706   38,60   16,80    0,00   55,40     2  tor
23:38:43      127     10706   37,20   14,20    0,00   51,40     3  tor
23:38:48      127     10706   33,20   12,20    0,00   45,40     3  tor
23:38:53      127     10706   41,00   11,80    0,00   52,80     3  tor
23:38:58      127     10706   46,40   14,80    0,00   61,20     2  tor


And finally:
Do you change the number of maximum file descriptors? As of now,
cat /proc/sys/fs/file-nr
9248 0 163085

where
ls -l /proc/`echo $(pidof tor)`/fd | wc -l
5866

Best,
Paw
[1]
http://manpages.ubuntu.com/manpages/zesty/man8/tor-instance-create.8.html
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