Given a list of books (which I have on Amazon rn), can I find second-hand sellers who are selling the most books out of my list? Discogs (for music) works like that. e.g. build a list of 1000 records, and probably some seller will list 100 of them... sometimes for cheap ^^

Serf is also entirely different from zk and etcd

My brief experience with serf is the way it is done is you have some init that runs your processes and restarts them if needed

Systemd,monit,bluepill,unicorn, whatever

Which is not connected to serf in anyway, it is entirely local

And serf just lets other process know if your service is actually running

so you start serf separetly and make them watch your service?

Yes

but how, tell serf ping this address?

watch this file for change?

If I recall correctly that is not something serf does

You may be thinking of consul, which is hashicorps tool that does that sort of thing

thx