The one thing that feels lacking to me, and maybe there's just something I don't get, is the ability to tag nodes with metadata. From the docs it seems like what you're expected to do is fire an event for a node to, eg., declare itself a webserver, but this seems prone to failure in the long run. If I bring a new load balancer online how does it find out what's a webserver already?
This might be a little unclear, but if you check the documentation for agent configuration (http://www.serfdom.io/docs/agent/options.html), there is an option to provide a role. The role is the metadata support currently
Cool, I must have missed that. It would be nice, then, if you could also have a node be tagged with multiple roles (as well as add/remove them in a way that propagates).
Dynamic roles is a fairly hard problem, which we hope to solve by building a different tool on top of Serf in the near future. If you want multiple roles that are static, it can be simulated by just providing a comma separated value as the role (since that is just an opaque string value to Serf)
