diff --git a/provisioner/storage.go b/provisioner/storage.go
new file mode 100644
index 0000000..db64df2
--- /dev/null
+++ b/provisioner/storage.go
@@ -0,0 +1,44 @@
+package main
+
+import (
+	"log"
+)
+
+type Storage interface {
+	Put(id string, update StatusMsg) error
+	Get(id string) (*StatusMsg, error)
+	List() ([]StatusMsg, error)
+}
+
+type MemoryStorage struct {
+	Data map[string]StatusMsg
+}
+
+func NewMemoryStorage() *MemoryStorage {
+	return &MemoryStorage{
+		Data: make(map[string]StatusMsg),
+	}
+}
+
+func (s *MemoryStorage) Put(id string, update StatusMsg) error {
+	s.Data[id] = update
+	log.Printf("%s : %s", id, update.Status.String())
+	return nil
+}
+
+func (s *MemoryStorage) Get(id string) (*StatusMsg, error) {
+	m, ok := s.Data[id]
+	if !ok {
+		return nil, nil
+	}
+	return &m, nil
+}
+
+func (s *MemoryStorage) List() ([]StatusMsg, error) {
+	r := make([]StatusMsg, len(s.Data))
+	i := 0
+	for _, v := range s.Data {
+		r[i] = v
+	}
+	return r, nil
+}