--- loncom/clusteradmin	2011/05/16 15:48:26	1.5
+++ loncom/clusteradmin	2018/08/20 22:31:49	1.7
@@ -1,4 +1,29 @@
 #!/usr/bin/perl
+# The LearningOnline Network with CAPA
+# Push admin files from cluster manager to cluster's "name servers".
+#
+# $Id: clusteradmin,v 1.7 2018/08/20 22:31:49 raeburn Exp $
+#
+# Copyright Michigan State University Board of Trustees
+#
+# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
+# LON-CAPA is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# LON-CAPA is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with LON-CAPA; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# /home/httpd/html/adm/gpl.txt
+#
+# http://www.lon-capa.org/
 
 =pod
 
@@ -8,9 +33,12 @@
 
 =head1 DESCRIPTION
 
-Performs an adminstrative action on DNS hosts in the current hosts.tab
-file.  For this to work, the current host must be the cluster administrator
-on the target systems.  That is this must be a host in managers.tab
+Performs an adminstrative update on (a) "DNS" hosts or domains in the current 
+dns_hosts.tab or dns_domain.tab files, or (b) update of the Certificate 
+Revocation List (CRL) file for the cluster.  
+
+For this to work, the current host must be the cluster administrator
+on the target systems.  That is this must be a host in managers.tab.
 Furthermore, lonc must be running on this system.
 
 The action is specified by the 'command' parameter which may have additional arguments.
@@ -39,8 +67,8 @@ on this system.  'file' is the name of t
 
 =head1 ASSUMPTIONS
 
-Assume that loncapa is installedin /home/httpd/lib/perl so that we can use
-it's modules.  If this is not the case, you mus modify the
+Assume that loncapa is installed in /home/httpd/lib/perl so that we can use
+it's modules.  If this is not the case, you must modify the
 use lib line in the program before you can use it.