Hello, does anyone know how I can check whether a specific node (that is in possesion of a server token) can join a specific cluster (where I have an IP address of one of its nodes)?

you could curl the config endpoint using the password portion of the token as the basic auth password

That sounds great, which URL is the config endpoint?

something like this:

curl -vks --basic --user node:PASS <https://server:6443/v1-k3s/readyz>

where PASS is the node join token

That works great, many thanks. I wonder whether this API (and possibly others) is documented somewhere...

Ok thanks... I guess that's what we have 🙂