runtime: minor fixes for local runtime (#2019)

runtime/local/local.go

@@ -18,7 +18,7 @@ import (
 )
 
 // defaultNamespace to use if not provided as an option
-const defaultNamespace = "default"
+const defaultNamespace = "micro"
 
 var (
 	// The directory for logs to be output
@@ -313,7 +313,7 @@ func (r *localRuntime) Create(s *runtime.Service, opts ...runtime.CreateOption)
 		r.namespaces[options.Namespace] = make(map[string]*service)
 	}
 	if _, ok := r.namespaces[options.Namespace][serviceKey(s)]; ok {
-		return errors.New("service already running")
+		return runtime.ErrAlreadyExists
 	}
 
 	// create new service

runtime/runtime.go

@@ -8,6 +8,7 @@ import (
 
 var (
 	ErrAlreadyExists = errors.New("already exists")
+	ErrNotFound      = errors.New("not found")
 )
 
 // Runtime is a service runtime manager