[tor-relays] Restarting Tor

Tor Manager tor at ibiblio.org
Sun Oct 10 15:44:19 UTC 2021

Greetings! Thanks for running your relays!

On Sunday, October 10, 2021 at 4:49:16 AM UTC-4 sysmanager7 via tor-relays 

> Greetings All, I have three relays that are in need of an upgrade and 
> reboot.
> What is the best way to restart these relays without loosing flags or time?

We routinely reboot our nodes for kernel updates and retain the stable 
flag. High uptime is not something to brag about for a tor node, so don't 
worry about that.

If you're running a debian-based linux distro, you can have 
unattended-upgrades[0] do the work for you and warn you via email. There 
are tools that will allow for similar workflows for other OSes, eg. with 
dnf on rpm-based distros[1].


> Secondly how long can a relay be down before flags are dropped?

I don't know the upper bound, but twice I've migrated keys from an old 
piece of hardware to a new piece of hardware when the support warranty 
expired, and that node still has the stable flag. I took my time and did 
the migration carefully. It's far more important that you follow the 
advice[2] on how to keep your relay in good shape once it's up and running 
than that you find the limits of certain flags.

ibiblio Tor Manager

[0] https://wiki.debian.org/UnattendedUpgrades
[1] https://dnf.readthedocs.io/en/latest/automatic.html
[2] https://community.torproject.org/relay/setup/post-install/
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