diff --git a/scripts/dhcp b/scripts/dhcp
index 19f8cdb..3370e68 100755
--- a/scripts/dhcp
+++ b/scripts/dhcp
@@ -27,6 +27,17 @@ class DhcpRegistry < Registry
     end
     dhcp_path = Pathname.new(File.expand_path("../../dhcp.peers.conf", __FILE__))
     File.open(dhcp_path, "w+").write(dhcp_template.render(leases: static_leases))
+
+    reload_dhcp
+  end
+
+  def reload_dhcp
+    command = try(data, "host", "reload_command")
+    if command.nil?
+      puts "skip to reload dhcpd because reload_command is not defined"
+    else
+      sh(command)
+    end
   end
 end
 
diff --git a/scripts/openvpn b/scripts/openvpn
index eefca66..08473c6 100755
--- a/scripts/openvpn
+++ b/scripts/openvpn
@@ -113,9 +113,8 @@ class OpenvpnRegistry < Registry
     end
 
     def service_command(command_type, peer_name)
-      openvpn = @host["openvpn"] || {}
       cmd_name = "#{command_type}_command"
-      command = openvpn[cmd_name]
+      command = try(@host, "openvpn", cmd_name)
       if command.nil?
         puts "skip to #{command_type} openvpn because #{cmd_name} is not defined"
       else
diff --git a/scripts/utils.rb b/scripts/utils.rb
index d410700..dac4bcd 100644
--- a/scripts/utils.rb
+++ b/scripts/utils.rb
@@ -41,6 +41,18 @@ def die(msg)
   exit(1)
 end
 
+def try(hash, *args)
+  result = hash
+  args.each do |arg|
+    if result.respond_to?(:[]) && result[arg]
+      result = result[arg]
+    else
+      return nil
+    end
+  end
+  result
+end
+
 class TemplateContext < OpenStruct
   def get_binding
     binding