IT/Software/Networking/ZeroTier

Basics

You need to get an account at ZeroTier

You can connect up to 100 computers for free.

After that get another and you get 200.

Install

 curl -s https://install.zerotier.com | sudo bash

There is a more complicated(more secure?) script on their download page but I do not get it to work.

Errors 1

It will not install if your package manager has issues.

sudo apt --fix-broken install

sudo dpkg --configure -a

Now try the install again.

Errors 2

You may get 401 errors or "no port. . . " errors
you need to purge and reinstall.

sudo apt purge zerotier-one

You may then still need to remove var/lib/zerotier-one
If you have a snap installed they will not work together

sudo snap remove zerotier-one

Errors 3

Your connection is stuck "OFFLINE" when you

sudo zerotier-cli status

You need to stop and start the service.

sudo systemctl restart zerotier-one

Some sites recommend "stop" and then wait for ten minutes and "start"

Errors 4

sudo zerotier-cli status
Error connecting to the ZeroTier service: connection failed

Please check that the service is running and that TCP port 9993 can be contacted via 127.0.0.1.

For some reason the service is not running.

sudo service zerotier-one start

Join your network

The scary thing here is you don't need any kind of a password

Once you join you will still need the address of others in the network to access them.
sudo zerotier-cli join XXXXXXXXXXXXXX

No I will not give you my network id!

Summary

That is all there is. In two commands you are connected.