diff --git a/xCAT-server/share/xcat/netboot/rh/compute.rhels7.ppc64.postinstall b/xCAT-server/share/xcat/netboot/rh/compute.rhels7.ppc64.postinstall
index 0819752bb..02effbf98 100755
--- a/xCAT-server/share/xcat/netboot/rh/compute.rhels7.ppc64.postinstall
+++ b/xCAT-server/share/xcat/netboot/rh/compute.rhels7.ppc64.postinstall
@@ -35,7 +35,10 @@ echo "co:2345:respawn:/sbin/agetty -L 38400 console" >> $installroot/etc/inittab
 #-- Disable SELinux in the rootimg
 #-- Redhat 7.3 will install selinux-policy and selinux is enabled by default
 #-- Need to disable selinux, otherwise, the booting  will hang on "Loading selinux policy"
-sed -i 's/SELINUX=enforcing\|permissive/SELINUX=disabled/' $installroot/etc/selinux/config
+if [ -f "$installroot/etc/selinux/config" ]
+then
+    sed -i 's/SELINUX=enforcing\|permissive/SELINUX=disabled/' $installroot/etc/selinux/config
+fi
 
 #-- Example of booted image versioning
 #-- We want to know, with what configuration (version of the image) each node was booted.
diff --git a/xCAT-server/share/xcat/netboot/rh/compute.rhels7.x86_64.postinstall b/xCAT-server/share/xcat/netboot/rh/compute.rhels7.x86_64.postinstall
index b8eee319e..e8883be8f 100755
--- a/xCAT-server/share/xcat/netboot/rh/compute.rhels7.x86_64.postinstall
+++ b/xCAT-server/share/xcat/netboot/rh/compute.rhels7.x86_64.postinstall
@@ -35,8 +35,10 @@ END
 #-- Disable SELinux in the rootimg
 #-- Redhat 7.3 will install selinux-policy and selinux is enabled by default
 #-- Need to disable selinux, otherwise, the booting  will hang on "Loading selinux policy"
-sed -i 's/SELINUX=enforcing\|permissive/SELINUX=disabled/' $installroot/etc/selinux/config
-
+if [ -f "$installroot/etc/selinux/config" ]
+then
+    sed -i 's/SELINUX=enforcing\|permissive/SELINUX=disabled/' $installroot/etc/selinux/config
+fi
 
 #-- Example of booted image versioning
 #-- We want to know, with what configuration (version of the image) each node was booted.
diff --git a/xCAT-server/share/xcat/netboot/rh/service.postinstall b/xCAT-server/share/xcat/netboot/rh/service.postinstall
index 86e295e45..192b22c78 100755
--- a/xCAT-server/share/xcat/netboot/rh/service.postinstall
+++ b/xCAT-server/share/xcat/netboot/rh/service.postinstall
@@ -39,7 +39,10 @@ echo "co:2345:respawn:/sbin/agetty -L 38400 console" >> $installroot/etc/inittab
 #-- Disable SELinux in the rootimg
 #-- Redhat 7.3 will install selinux-policy and selinux is enabled by default
 #-- Need to disable selinux, otherwise, the booting  will hang on "Loading selinux policy"
-sed -i 's/SELINUX=enforcing\|permissive/SELINUX=disabled/' $installroot/etc/selinux/config
+if [ -f "$installroot/etc/selinux/config" ]
+then
+    sed -i 's/SELINUX=enforcing\|permissive/SELINUX=disabled/' $installroot/etc/selinux/config
+fi
 
 #-- Example of booted image versioning
 #-- We want to know, with what configuration (version of the image) each node was booted.