diff --git a/perl-xCAT-2.0/perl-xCAT.spec b/perl-xCAT-2.0/perl-xCAT.spec
index 510ecb64a..fea88cc9e 100644
--- a/perl-xCAT-2.0/perl-xCAT.spec
+++ b/perl-xCAT-2.0/perl-xCAT.spec
@@ -82,7 +82,7 @@ rm -rf $RPM_BUILD_ROOT
 %post
 %ifos linux
 if [ "$1" -gt 1 ]; then #Ugrade only, restart daemon and migrate settings
-   if [ -x /etc/init.d/xcatd ]; then
+   if [ -x /etc/init.d/xcatd ] && [ -f "/proc/cmdline" ]; then
       . /etc/profile.d/xcat.sh
       /etc/init.d/xcatd restart
       #THE NEXT BIT SHOULD NOT BE RELEVANT TO RELEASE, IT SHOULD HELP A BETA INSTALL UPDATE GRACEFULLY
diff --git a/xCAT-nbroot/xcat-core-nbroot.spec b/xCAT-nbroot/xcat-core-nbroot.spec
index b0eacfebc..76aeb22d9 100644
--- a/xCAT-nbroot/xcat-core-nbroot.spec
+++ b/xCAT-nbroot/xcat-core-nbroot.spec
@@ -52,10 +52,11 @@ cd -
 
 
 %post
-if [ "$1" == "2" ]; then #only on upgrade, as on install it's probably not going
-                         #to work...
-   . /etc/profile.d/xcat.sh
-   mknb %{tarch}
+if [ "$1" == "2" ]; then #only on upgrade, as on install it's probably not going to work...
+	if [ -f "/proc/cmdline" ]; then   # prevent running it during install into chroot image
+   		. /etc/profile.d/xcat.sh
+   		mknb %{tarch}
+   	fi
 fi
 
 %Files