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On my linux i can run sudo journalctl -u tor@default to see tor log. where is the log file stored on the system. Maybe a unix.stakexchange kind of question but i opt to ask it here

  • Which distribution are you using? – Jens Kubieziel Sep 12 '18 at 11:32
  • @JensKubieziel kali-rolling – pouya Sep 12 '18 at 11:42
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Usually Tor stores its log files in /var/log/tor. Depending from the specific settings you'll find /var/log/tor/notices.log, /var/log/tor/log, /var/log/tor/info.log, etc.

The option Log in torrc specifies where the log file is stored and what kind of information is logged. So if you don't find the above mentioned files please have a look into your configuration.

  • Nothing exists in /var/log/tor and all options related to logging is commented out in my /etc/tor/torrc file. Still journalctl manages to show me tor logs. I guess it is related to how tor service is configured on the system than the tor configuration itself. – pouya Sep 12 '18 at 7:51
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By default stdout and stderr of a systemd unit are sent to syslog. On my machine(Kali distro) it is stored in /var/log/syslog. So to see tor unit output run

cat /var/log/syslog | grep tor -i

Edit

In case someone needs to monitor tor unit i found a better way. Adding -f or --follow flag to journalctl makes it to continuously print new entries as they are appended to the journal. You can then pipe it to a parser and react based on it.

In one of your termianl tabs run

sudo journalctl -f -u tor@default | grep bootstrapped -i

in another tab do

sudo systemctl restart tor

You will see the results are appended to the first terminal as they are appended to the systemd journal

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