--- loncom/loncron	2018/11/18 22:50:46	1.114
+++ loncom/loncron	2018/11/24 16:19:09	1.115
@@ -2,7 +2,7 @@
 
 # Housekeeping program, started by cron, loncontrol and loncron.pl
 #
-# $Id: loncron,v 1.114 2018/11/18 22:50:46 raeburn Exp $
+# $Id: loncron,v 1.115 2018/11/24 16:19:09 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -511,6 +511,34 @@ sub clean_lonIDs {
     &log($fh,"<h3>$active open session(s)</h3>");
 }
 
+# -------------------------------------------------------- clean out balanceIDs
+
+sub clean_balanceIDs {
+    my ($fh)=@_;
+    &log($fh,'<hr /><a name="balcookies" /><h2>Session Tokens</h2>');
+    my $cleaned=0;
+    my $active=0;
+    if (-d $perlvar{'lonBalanceDir'}) {
+        while (my $fname=<$perlvar{'balanceDir'}/*.id>) {
+            my ($dev,$ino,$mode,$nlink,
+                $uid,$gid,$rdev,$size,
+                $atime,$mtime,$ctime,
+                $blksize,$blocks)=stat($fname);
+            my $now=time;
+            my $since=$now-$mtime;
+            if ($since>$perlvar{'lonExpire'}) {
+                $cleaned++;
+                &log($fh,"Unlinking $fname<br />");
+                unlink("$fname");
+            } else {
+                $active++;
+            }
+        }
+    }
+    &log($fh,"<p>Cleaned up ".$cleaned." stale balancer files</p>");
+    &log($fh,"<h3>$active unexpired balancer files</h3>");
+}
+
 # ------------------------------------------------ clean out webDAV Session IDs
 sub clean_webDAV_sessionIDs {
     my ($fh)=@_;
@@ -1471,6 +1499,7 @@ sub main () {
 	&log_machine_info($fh);
 	&clean_tmp($fh);
 	&clean_lonIDs($fh);
+        &clean_balanceIDs($fh);
         &clean_webDAV_sessionIDs($fh);
 	&check_httpd_logs($fh);
 	&rotate_lonnet_logs($fh);