The trick with flanneld on our other hosts is that AFAICT there's no way to run flanneld as purely a "grab routes and install them" without having it get a totally unnecessary (and completely unused) subnet lease.

I have considered just writing a quicky daemon that will do just the work of syncing routes without getting a lease (or trying to modify flanneld to do so).

The service in this case is memcache with a bunch of mcrouter pods in front of it to handle failure and cold cache warming. I still need to get traffic to the mcrouter instances and that's where I'm running into the bottleneck.