Tor writes it's pidfile to /var/run/tor/tor.pid by default. However, ​https://gitweb.torproject.org/tor.git/tree/contrib/dist/tor.service.in specifies that all but 2 directories are read only. Therefore, when one starts tor using: ``` systemctl start tor ``` using the default configuration, this error is logged in the journal: ``` Jul 26 22:42:32 irrational Tor[19048]: Unable to open "/var/run/tor/tor.pid" for writing: Read-only file system ``` and no pidfile is written. Adding: ``` ReadWriteDirectories=-/var/run/tor ``` to the [Service] section fixes the problem. **Trac**: **Username**: candrews