Add proxy mode.

server/set_cluster_config_command.go

@@ -0,0 +1,25 @@
+package server
+
+import (
+	"github.com/coreos/etcd/third_party/github.com/coreos/raft"
+)
+
+func init() {
+	raft.RegisterCommand(&SetClusterConfigCommand{})
+}
+
+// SetClusterConfigCommand sets the cluster-level configuration.
+type SetClusterConfigCommand struct {
+	Config *ClusterConfig `json:"config"`
+}
+
+// CommandName returns the name of the command.
+func (c *SetClusterConfigCommand) CommandName() string {
+	return "etcd:setClusterConfig"
+}
+
+// Apply updates the cluster configuration.
+func (c *SetClusterConfigCommand) Apply(context raft.Context) (interface{}, error) {
+	ps, _ := context.Server().Context().(*PeerServer)
+	return nil, ps.SetClusterConfig(c.Config)
+}