diff --git a/cmd/control/os.go b/cmd/control/os.go
index b24bab6e..b41ab3aa 100644
--- a/cmd/control/os.go
+++ b/cmd/control/os.go
@@ -54,6 +54,10 @@ func osSubcommands() []cli.Command {
 					Name:  "kexec",
 					Usage: "reboot using kexec",
 				},
+				cli.StringFlag{
+					Name:  "append",
+					Usage: "kernel args to append by kexec",
+				},
 			},
 		},
 		{
@@ -153,7 +157,7 @@ func osUpgrade(c *cli.Context) {
 	if c.Args().Present() {
 		log.Fatalf("invalid arguments %v", c.Args())
 	}
-	if err := startUpgradeContainer(image, c.Bool("stage"), c.Bool("force"), !c.Bool("no-reboot"), c.Bool("kexec")); err != nil {
+	if err := startUpgradeContainer(image, c.Bool("stage"), c.Bool("force"), !c.Bool("no-reboot"), c.Bool("kexec"), c.String("append")); err != nil {
 		log.Fatal(err)
 	}
 }
@@ -172,7 +176,7 @@ func yes(in *bufio.Reader, question string) bool {
 	return strings.ToLower(line[0:1]) == "y"
 }
 
-func startUpgradeContainer(image string, stage, force, reboot, kexec bool) error {
+func startUpgradeContainer(image string, stage, force, reboot, kexec bool, kernelArgs string) error {
 	in := bufio.NewReader(os.Stdin)
 
 	command := []string{
@@ -182,6 +186,11 @@ func startUpgradeContainer(image string, stage, force, reboot, kexec bool) error
 
 	if kexec {
 		command = append(command, "-k")
+
+		kernelArgs = strings.TrimSpace(kernelArgs)
+		if kernelArgs != "" {
+			command = append(command, "-a", kernelArgs)
+		}
 	}
 
 	container, err := compose.CreateService(nil, "os-upgrade", &project.ServiceConfig{
diff --git a/scripts/installer/lay-down-os b/scripts/installer/lay-down-os
index 9bd0f4cb..eef3f7e1 100755
--- a/scripts/installer/lay-down-os
+++ b/scripts/installer/lay-down-os
@@ -6,7 +6,7 @@ SCRIPTS_DIR=$(dirname ${0})
 . "${SCRIPTS_DIR}/build.conf"
 VERSION=${VERSION:?"VERSION not set"}
 
-while getopts "i:f:c:d:t:r:o:p:k" OPTION
+while getopts "i:f:c:d:t:r:o:p:k:a" OPTION
 do
     case ${OPTION} in
         i) DIST="$OPTARG" ;;
@@ -17,6 +17,7 @@ do
         p) PARTITION="$OPTARG" ;;
         r) ROLLBACK_VERSION="$OPTARG" ;;
         k) KEXEC=y ;;
+        a) APPEND="$OPTARG" ;;
         t) ENV="$OPTARG" ;;
         *) exit 1 ;;
     esac
@@ -195,5 +196,8 @@ pvgrub_config "${KERNEL_ARGS}"
 install_rancher
 
 if [ "$KEXEC" = "y" ]; then
-    kexec -l ${DIST}/vmlinuz --initrd=${DIST}/initrd -f
+    if [ "$APPEND" = "" ]; then
+        APPEND=$(cat /proc/cmdline)
+    fi
+    kexec -l ${DIST}/vmlinuz --initrd=${DIST}/initrd --append="$APPEND" -f
 fi