Works!

bin/teardown.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+if [ $# != 1 ]; then
+    echo "usage: teardown.sh name"
+    exit 1
+fi
+
+d=$1
+f=.$d.$$
+
+# nixops ssh -d $d ${d}0-0 kubectl delete --all pods
+# nixops ssh -d $d ${d}0-0 kubectl --namespace kube-system delete --all pods
+# sleep 60
+
+sed -s 's/require = \[ \+base .*/require = [ base ];/' $d.nix > $f
+nixops modify -d $d $f
+nixops deploy -d $d
+rm $f
+
+nixops ssh-for-each -d $d "rm -rf /var/run/kubernetes /var/lib/kubernetes /var/lib/etcd"
+nixops ssh-for-each -d $d reboot
+