--- loncom/loncron	2019/07/07 15:47:40	1.103.2.3
+++ loncom/loncron	2019/07/07 16:15:24	1.103.2.4
@@ -2,7 +2,7 @@
 
 # Housekeeping program, started by cron, loncontrol and loncron.pl
 #
-# $Id: loncron,v 1.103.2.3 2019/07/07 15:47:40 raeburn Exp $
+# $Id: loncron,v 1.103.2.4 2019/07/07 16:15:24 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -971,19 +971,23 @@ Options:
 				do not send emails do not
                                 check if the daemons are running, do not
                                 generate lon-status
-                           
+   --justiptables          Only update the dynamic iptables rules for the
+                                lond port; do not send emails, do not
+                                check if the daemons are running, do not
+                                generate lon-status
 USAGE
 }
 
 # ================================================================ Main Program
 sub main () {
     my ($help,$justcheckdaemons,$noemail,$justcheckconnections,
-	$justreload);
+	$justreload,$justiptables);
     &GetOptions("help"                 => \$help,
 		"justcheckdaemons"     => \$justcheckdaemons,
 		"noemail"              => \$noemail,
 		"justcheckconnections" => \$justcheckconnections,
-		"justreload"           => \$justreload
+		"justreload"           => \$justreload,
+                "justiptables"         => \$justiptables
 		);
     if ($help) { &usage(); return; }
 # --------------------------------- Read loncapa_apache.conf and loncapa.conf
@@ -1033,9 +1037,11 @@ sub main () {
             }
         }
     }
-    &Apache::lonnet::load_hosts_tab(1,$nomemcache);
-    &Apache::lonnet::load_domain_tab(1,$nomemcache);
-    &Apache::lonnet::get_iphost(1,$nomemcache);
+    if (!$justiptables) {
+        &Apache::lonnet::load_hosts_tab(1,$nomemcache);
+        &Apache::lonnet::load_domain_tab(1,$nomemcache);
+        &Apache::lonnet::get_iphost(1,$nomemcache);
+    }
 
 # ----------------------------------------- Force firewall update for lond port  
 
@@ -1066,7 +1072,7 @@ sub main () {
 
 	
     my $fh;
-    if (!$justcheckdaemons && !$justcheckconnections && !$justreload) {
+    if (!$justcheckdaemons && !$justcheckconnections && !$justreload && !$justiptables) {
 	$fh=&start_logging();
 
 	&log_machine_info($fh);
@@ -1077,7 +1083,7 @@ sub main () {
 	&rotate_lonnet_logs($fh);
 	&rotate_other_logs($fh);
     }
-    if (!$justcheckconnections && !$justreload) {
+    if (!$justcheckconnections && !$justreload && !$justiptables) {
 	&checkon_daemon($fh,'lonmemcached',40000);
 	&checkon_daemon($fh,'lonsql',200000);
 	if ( &checkon_daemon($fh,'lond',40000,'USR1') eq 'running') {
@@ -1094,7 +1100,7 @@ sub main () {
     if ($justcheckconnections) {
 	&test_connections($fh);
     }
-    if (!$justcheckdaemons && !$justcheckconnections && !$justreload) {
+    if (!$justcheckdaemons && !$justcheckconnections && !$justreload && !$justiptables) {
 	&check_delayed_msg($fh);
 	&finish_logging($fh);
 	&log_simplestatus();