--- doc/loncapafiles/updatequery.piml	2005/07/01 18:21:47	1.39
+++ doc/loncapafiles/updatequery.piml	2007/04/03 22:13:40	1.52
@@ -1,6 +1,6 @@
 <!-- updatequery.piml -->
 
-<!-- $Id: updatequery.piml,v 1.39 2005/07/01 18:21:47 albertel Exp $ -->
+<!-- $Id: updatequery.piml,v 1.52 2007/04/03 22:13:40 albertel Exp $ -->
 
 <!--
 
@@ -70,10 +70,10 @@ you must contact lon-capa\@lon-capa.org.
 3) DEVELOPMENT - you want to do software (not content!) development with
                  this workstation and eventually link it with the
                  workstations of other LON-CAPA software developers.
-4) PRESERVE the existing hosts.tab and domain.tab
-                (/home/httpd/lonTabs/hosts.tab and
-                 /home/httpd/lonTabs/domain.tab)
-
+4) RUNNING YOUR OWN CLUSTER - this machine is not in the standard LON-CAPA
+                 clusters and won't be in the future and you want the existing
+                 hosts.tab and domain.tab files to be left alone.
+                 (This choice is unlikely what you want to select.)
 END
 # Option number 26 will install rawhide_hosts.tab, but
 # the typical user does not want to be part of an intensive
@@ -97,23 +97,17 @@ while (!$flag) {
   }
   elsif ($choice==4) {
     $lonCluster='existing'; $flag=1;
-    if (-e '/home/httpd/lonTabs/hosts.tab') {
-      `cp /home/httpd/lonTabs/hosts.tab ../existing_hosts.tab`;
-    }
-    else {
-      print &lt;&lt;END;
-There is no existing /home/httpd/lonTabs/hosts.tab
+    foreach my $file ('hosts.tab','dns_hosts.tab',
+                      'domain.tab','dns_domain.tab') {
+        if (-e '/home/httpd/lonTabs/'.$file) {
+	    `cp /home/httpd/lonTabs/$file ../existing_$file`;
+        }
+        else {
+	    print &lt;&lt;END;
+There is no existing /home/httpd/lonTabs/$file
 END
-      die('');
-    }
-    if (-e '/home/httpd/lonTabs/domain.tab') {
-      `cp /home/httpd/lonTabs/domain.tab ../existing_domain.tab`;
-    }
-    else {
-      print &lt;&lt;END;
-There is no existing /home/httpd/lonTabs/domain.tab
-END
-      die('');
+            die('');
+        }
     }
   }
   elsif ($choice==26) {
@@ -129,6 +123,8 @@ END
 $|=1;
 my $domainDescription;
 my $domainTabExtras;
+my $primaryLibServer;
+my @libservers = ();
 unless (-e "<TARGET />") {
   print(&lt;&lt;END);
            WELCOME TO LON-CAPA!
@@ -141,7 +137,7 @@ The following 4 values are needed to con
 * Machine Role
 * LON-CAPA Domain Name
 * LON-CAPA Machine ID Name, and
-* System Administration E-mail Address.
+* Server Administration E-mail Address.
 ===============================================================================
 
 In addition, a Support E-mail Address can also be included. If
@@ -205,18 +201,24 @@ if ($hostname=~/([^\.]*)\.([^\.]*)$/) {
   print(&lt;&lt;END);
 
 **** Domain ****
-[this does NOT need to correspond to internet address domains,
- good examples might be "msu" or "bionet" or "vermontcc",
- bad examples are "physics" (too general)
+[This does NOT need to correspond to internet address domains.
+ Please make this name short AND descriptive of your organization.
+ Domain names are close to impossible to change later!!!
+ Good examples might be "msu" or "bionet" or "vermontcc".
+ Bad examples are "physics" (too general)
    or "michiganstateuniversity" (too long)
    or "msuedu" (internet domain, just make it "msu")
-   or "msuphysics" (only if there is a good reason to limit)
+   or "msuphysics" (only if there is a good reason to limit to department
+                    - we don't know of one)
    or "mydomain" (what is that?)
- Please make this name short AND descriptive of your organization.
- Note that the domain is very hard to change later.
- Double-check with the LON-CAPA group at MSU if this domain is 
- going to be part of the main production cluster, since it needs
- to be unique.]
+ Avoid multiple domains at the same institution, even if it means that you 
+ have to actually work together with your colleagues. You can still run
+ multiple library servers within the same domain.
+ If this domain is eventually going to be part of the main production
+ cluster, you MUST contact the LON-CAPA group at MSU (loncapa@loncapa.org)
+ to have a domain name assigned, and then use it exactly as given. This is
+ also true for test installs that might eventually turn into production setups.
+ Stop now if you didn't do so.]
 END
 
 # get domain name
@@ -237,7 +239,8 @@ END
   my $choice=&lt;&gt;;
   chomp($choice);
   my $bad_domain_flag=0;
-  my @bad_domain_names=('res','raw','userfiles','priv','adm','uploaded');
+  my @bad_domain_names=('res','raw','userfiles','priv','adm','uploaded',
+	'editupload');
   foreach my $bad (@bad_domain_names) {
     $bad_domain_flag=1 if $choice eq $bad;
   }
@@ -251,14 +254,14 @@ END
     close(OUT);
     $lonDefDomain=$choice;
     $flag=1;
-  } elsif (length($choice)>12) {
+  } elsif (length($choice)>35) {
     print "Name too long\n";
   } elsif (length($choice)<2) {
     print "Name too short\n";
   } elsif ($bad_domain_flag) {
     print "Invalid input ('$choice' conflicts with LON-CAPA namespace).\n";
     print "Please try something different than '$choice'\n";
-  } elsif ($choice!~/\_/ and $choice=~/^\w+$/) {
+  } elsif ($choice!~/\_/ and $choice=~/^[\w\-.]+$/) {
     open(OUT,'&gt;&gt;/tmp/loncapa_updatequery.out');
     print(OUT 'lonDefDomain'."\t".$choice."\n");
     close(OUT);
@@ -266,7 +269,7 @@ END
     $r='l';
     $flag=1;
   } else {
-    print "Invalid input (only alphanumeric characters supported).\n";
+    print "Invalid input (only alphanumeric characters, '-', and '.' supported).\n";
   }
 }
 
@@ -307,11 +310,11 @@ if ($lonDefDomain) {
   print(&lt;&lt;END);
 
 **** Machine ID Name ****
-[this does NOT need to correspond to internet address names;
+[This does NOT need to correspond to internet address names;
  this name MUST be unique to the whole LON-CAPA network;
- we recommend that you use a name based off of your institution;
- good examples: "msul1" or "bioneta2";
- bad examples: "loncapabox" or "studentsinside".
+ we recommend that you use a name based off of your institution.
+ Good examples: "msul1" or "bioneta2".
+ Bad examples: "loncapabox" or "studentsinside".
  Note that machine names are very hard to change later.]
 END
 # get machine name
@@ -339,21 +342,78 @@ END
     close(OUT);
     $lonHostID=$choice;
     $flag=1;
-  } elsif (length($choice)>15) {
+  } elsif (length($choice)>45) {
     print "Name too long\n";
   } elsif (length($choice)<4) {
     print "Name too short\n";
-  } elsif ($choice!~/\_/ and $choice=~/^\w+$/) {
+  } elsif ($choice!~/\_/ and $choice=~/^[\w\-.]+$/) {
     open(OUT,'&gt;&gt;/tmp/loncapa_updatequery.out');
     print(OUT 'lonHostID'."\t".$choice."\n");
     close(OUT);
     $lonHostID=$choice;
     $flag=1;
   } else {
-    print "Invalid input (only alphanumeric characters supported).\n";
+    print "Invalid input (only alphanumeric characters, '-', and '.' supported).\n";
   }
 }
 
+# get primary library server in domain
+if ($lonRole eq 'library') {
+    if (!grep/^\Q$lonHostID\E$/,@libservers) {
+        push(@libservers,$lonHostID);
+    } 
+    if (@libservers == 1) {
+        $primaryLibServer = $libservers[0];
+    }
+}
+while (!$flag) {
+  print(&lt;&lt;END);
+**** Domain's Primary Library Server ID ****
+This should be the LON-CAPA machine ID of a library server in your 
+domain.  If you only have a single library server in your domain, then
+the Primary Library server ID will be the machine ID of that server. 
+This server will be where domain data which are not associated with any
+specific home library server will be stored (e.g., e-mail broadcast by
+administrators to users in the domain).
+END
+    if (defined($primaryLibServer)) {
+        print(&lt;&lt;END);
+ENTER DOMAIN'S PRIMARY LIBRARY SERVER ID [$primaryLibServer]:
+END
+    } elsif (@libservers > 0) {
+        print(&lt;&lt;END);
+ENTER DOMAIN'S PRIMARY LIBRARY SERVER ID [$libservers[0]]
+END
+    } else {
+        print (&lt;&lt;END);
+No library servers could be identified for this domain.  If you have already installed LON-CAPA on a different server (designated as a library server) in this domain, please enter the LONCAPA MACHINE ID of that server.  If not, you will need to install a LON-CAPA library server.  Enter the MACHINE ID of the server you plan to designate as a library server.
+END
+    }
+
+    my $choice=&lt;&gt;;
+    chomp($choice);
+    if ($primaryLibServer and $choice=~/^\s*$/) {
+        $choice=$primaryLibServer;
+        open(OUT,'&gt;&gt;/tmp/loncapa_updatequery.out');
+        print(OUT 'primaryLibServer'."\t".$choice."\n");
+        close(OUT);
+        $flag=1;
+    } elsif (length($choice)>35) {
+        print "Name too long\n";
+    } elsif (length($choice)<4) {
+        print "Name too short\n";
+    } elsif ($choice!~/\_/ and $choice=~/^[\w\-.]+$/) {
+        open(OUT,'&gt;&gt;/tmp/loncapa_updatequery.out');
+        print(OUT 'primaryLibServer'."\t".$choice."\n");
+        close(OUT);
+        $primaryLibServer=$choice;
+        $flag=1;
+    } else {
+        print "Invalid input (only alphanumeric characters, '-', and '.' supported).\n";
+    }
+}
+
+
 # get admin e-mail address
 # accept if valid, if not valid, tell user and repeat
 $flag=0;
@@ -361,7 +421,7 @@ my $lonAdmEMail;
 while (!$flag) {
   print(&lt;&lt;END);
 
-**** System Administrator's E-mail ****
+**** Server Administrator's E-mail ****
 E-mail address of the person who will manage this machine
 [should be in the form somebody\@somewhere]
 ENTER ADMIN E-MAIL ADDRESS:
@@ -416,8 +476,10 @@ END
 
 
 # update loncapa.conf
-my $confdir='/etc/httpd/conf/';
-#my $confdir='';
+my $confdir = '/etc/httpd/conf/';
+if ('<DIST />' eq 'sles10' || '<DIST />' eq 'suse10.1') {
+     $confdir = '/etc/apache2/';
+}   
 my $filename='loncapa.conf';
 my %perlvar;
     if (-e "$confdir$filename") {
@@ -458,8 +520,12 @@ my %perlvar;
       die("Cannot output to $confdir$filename\n");
     foreach my $key (keys %perlvar) {
       my $value=$perlvar{$key};
+      my $line = "PerlSetVar     $key      $value"; 
+      if ($value eq '') {
+          $line = '#'.$line;
+      }
       print(OUT &lt;&lt;END);
-PerlSetVar     $key      $value
+$line
 END
     }
     close(OUT);
@@ -467,7 +533,8 @@ END
 </perlscript>
 </file>
 <file>
-<target dist='default'>/</target>
+<target dist='default'>/etc/httpd/conf/</target>
+<target dist='sles10 suse10.1'>/etc/apache2/</target>
 <perlscript mode='fg'>
 sub securesetting {
     my (%perlvar)=@_;
@@ -485,7 +552,7 @@ sub securesetting {
     return ($securestatus,$securenum);
 }
 # read values from loncapa.conf
-my $confdir='/etc/httpd/conf/';
+my $confdir = "<TARGET />";
 my $filename='loncapa.conf';
 my %perlvar;
 my ($securestatus,$securenum);
@@ -546,6 +613,8 @@ my %perlvarstatic;
 	     (undef,$domainDescription,$domainTabExtras)=split(/:/,$_,3);
 	     chomp($domainDescription);
 	     chomp($domainTabExtras);
+	     # the remianing field (primary lib server) is handled later
+	     $domainTabExtras = join(':',(split(/:/,$domainTabExtras))[0..5]);
              last;
           }
        }
@@ -558,14 +627,62 @@ my %perlvarstatic;
 	     (undef,$domainDescription,$domainTabExtras)=split(/:/,$_,3);
 	     chomp($domainDescription);
 	     chomp($domainTabExtras);
+	     # the remianing field (primary lib server) is handled later
+	     $domainTabExtras = join(':',(split(/:/,$domainTabExtras))[0..5]);
              last;
           }
        }
        close(IN);
     }
+    if (!$primaryLibServer and $lonCluster ne 'existing') {
+        open(IN,'&lt;../'.$lonCluster.'_domain.tab');
+        while(&lt;IN&gt;) {
+            if (/^$perlvar{'lonDefDomain'}\:/) {
+                (undef,undef,undef,undef,undef,undef,undef,undef,
+                                              $primaryLibServer)=split(/:/,$_);
+                chomp($primaryLibServer);
+            }
+        }
+        close(IN);
+        if (!$primaryLibServer) {
+            open(IN,'&lt;../'.$lonCluster.'_hosts.tab');
+            while(&lt;IN&gt;) {
+                if (/^([^\:]+)\:\Q$perlvar{'lonDefDomain'}\E\:library\:/) {
+                    push(@libservers,$1);
+                }
+            }
+            close(IN);
+            if (@libservers == 1) {
+                $primaryLibServer = $libservers[0];
+            }
+        }
+    }
+    if (!$primaryLibServer) {
+        open(IN,'&lt;/home/httpd/lonTabs/domain.tab');
+        while(&lt;IN&gt;) {
+            if (/^$perlvar{'lonDefDomain'}\:/) {
+                (undef,undef,undef,undef,undef,undef,undef,undef,
+                                              $primaryLibServer)=split(/:/,$_);
+                chomp($primaryLibServer);
+            }
+            close(IN);
+        }
+        if (!$primaryLibServer) {
+            open(IN,'&lt;/home/httpd/lonTabs/hosts.tab');
+            while(&lt;IN&gt;) {
+                if (/^([^\:]+)\:\Q$perlvar{'lonDefDomain'}\E\:library\:/) {
+                    push(@libservers,$1);
+                }
+            }
+            close(IN);
+            if (@libservers == 1) {
+                $primaryLibServer = $libservers[0];
+            }
+        }
+    }
    
 # implement editing logic below, interactively
-# update loncapa.conf until 8 is entered
+# update loncapa.conf until 12 is entered
 
 $flag=0;
 
@@ -577,19 +694,20 @@ This is now the current configuration of
  1) Domain Name: $perlvar{'lonDefDomain'}
  2) Domain Description: $domainDescription
  3) Machine Name: $perlvar{'lonHostID'}
- 4) System Administrator's E-mail Address: $perlvar{'lonAdmEMail'}
- 5) Support E-mail Address: $perlvar{'lonSupportEMail'}
- 6) Role: $perlvar{'lonRole'}
- 7) Cache Expiration Time: $perlvar{'lonExpire'}
- 8) Server Load: $perlvar{'lonLoadLim'}
- 9) User Load: $perlvar{'lonUserLoadLim'}
-10) Allow only secure connections: $securestatus 
-11) Everything is correct up above
+ 4) ID of primary library server for domain: $primaryLibServer
+ 5) Server Administrator's E-mail Address: $perlvar{'lonAdmEMail'}
+ 6) Support E-mail Address: $perlvar{'lonSupportEMail'}
+ 7) Role: $perlvar{'lonRole'}
+ 8) Cache Expiration Time: $perlvar{'lonExpire'}
+ 9) Server Load: $perlvar{'lonLoadLim'}
+10) User Load: $perlvar{'lonUserLoadLim'}
+11) Allow only secure connections: $securestatus 
+12) Everything is correct up above
 END
 
 my $error='';
 foreach my $v ($perlvar{'lonDefDomain'},$perlvar{'lonHostID'}) {
-   if (length($v)>16) { $error.="\nName $v too long"; }		
+   if (length($v)>35) { $error.="\nName $v too long"; }		
    if (length($v)<2) { $error.="\nName $v too short"; }
    if ($v=~/capa/i) {
 	if ($v!~/^oucapa\d+$/ && 
@@ -597,12 +715,13 @@ foreach my $v ($perlvar{'lonDefDomain'},
 		 $error.="\nName $v contains 'capa'"; 
 	}
    }
-   foreach my $bad ('res','raw','userfiles','priv','adm','uploaded') {
+   foreach my $bad ('res','raw','userfiles','priv','adm','uploaded',
+	'editupload') {
       $error.="\nName $v reserved." if $v eq $bad;
    }
-   if ($v=~/\W/) { $error.="\nName $v contains special characters"; }
+   if ($v=~/[^\w\-.]/) { $error.="\nName $v contains special characters"; }
 }
-if ($domainDescription!~/^[\w\s]+$/) {
+if ($domainDescription!~/^[\(\)\-\w\s,]+$/) {
    $error.="\nDomain Description contains special characters";
 } 
 foreach my $v ($perlvar{'lonExpire'},$perlvar{'lonLoadLim'}) {
@@ -611,9 +730,33 @@ foreach my $v ($perlvar{'lonExpire'},$pe
 unless (($perlvar{'lonRole'} eq 'library') || ($perlvar{'lonRole'} eq 'access')) {
    $error.="\nInvalid Role";
 }
+
+if (!defined($primaryLibServer)) {
+   if (@libservers > 0) {
+       $error .= "No primary library server ID designated. Choose from: ".join(',',sort(@libservers));
+   } else {
+       $error .= "No library servers in this domain (including current server)";
+   }
+} else {
+   if (length($primaryLibServer)>35) { $error.="\nPrimary Library Server ID:  $primaryLibServer too long"; }
+   if (length($primaryLibServer)<2) { $error.="\nPrimary Library Server ID:  $primaryLibServer too short"; }
+   if ($primaryLibServer =~/capa/i) {
+        if ($primaryLibServer!~/^oucapa\d+$/ &&
+            ($primaryLibServer!~/^capa\d+$/ && $perlvar{'lonDefDomain'} eq 'uwsp')) {
+                 $error.="\nPrimary library server ID $primaryLibServer contains 'capa'";
+        }
+   }
+   foreach my $bad ('res','raw','userfiles','priv','adm','uploaded',
+        'editupload') {
+      $error.="\nPrimary library server ID $primaryLibServer reserved." if $primaryLibServer eq $bad;
+   }
+   if ($primaryLibServer=~/[^\w\-.]/) { $error.="\nPrimary library server ID $primaryLibServer contains special characters"; }
+}
+
+
 if ($error) { print "\n*** ERRORS: $error\n"; }
   print(&lt;&lt;END);
-ENTER A CHOICE OF 1-10 TO CHANGE, otherwise ENTER 11:
+ENTER A CHOICE OF 1-11 TO CHANGE, otherwise ENTER 12:
 END
 my $choice=&lt;&gt;;
 chomp($choice);
@@ -653,25 +796,39 @@ END
   }
   elsif ($choice==4) {
   print(&lt;&lt;END);
-4) System Administrator's E-mail Address: $perlvar{'lonAdmEMail'}
+4) ID of primary library server for domain: $primaryLibServer
+ENTER NEW VALUE (this will be the LON-CAPA Machine ID of a library server in
+                 your domain; it cannot contain any of '_' '-' '.' or ':'. 
+                 This server will be where domain data which are not 
+                 associated with any specific home library server
+                 will be stored (e.g., e-mail broadcast by Domain Coordinators
+                 to users in the domain).
+END
+    my $choice2=&lt;&gt;;
+    chomp($choice2);
+    $primaryLibServer=$choice2;
+  }
+  elsif ($choice==5) {
+  print(&lt;&lt;END);
+5) Server Administrator's E-mail Address: $perlvar{'lonAdmEMail'}
 ENTER NEW VALUE:
 END
     my $choice2=&lt;&gt;;
     chomp($choice2);
     $perlvar{'lonAdmEMail'}=$choice2;
   }
-  elsif ($choice==5) {
+  elsif ($choice==6) {
   print(&lt;&lt;END);
-5) Support E-mail Address: $perlvar{'lonSupportEMail'}
+6) Support E-mail Address: $perlvar{'lonSupportEMail'}
 ENTER NEW VALUE:
 END
     my $choice2=&lt;&gt;;
     chomp($choice2);
     $perlvar{'lonSupportEMail'}=$choice2;
   }
-  elsif ($choice==6) {
+  elsif ($choice==7) {
   print(&lt;&lt;END);
-6) Role: $perlvar{'lonRole'}
+7) Role: $perlvar{'lonRole'}
 ENTER NEW VALUE (this should be either 'access' or 'library' 
                  if in doubt select 'library'):
 END
@@ -679,27 +836,27 @@ END
     chomp($choice2);
     $perlvar{'lonRole'}=$choice2;
   }
-  elsif ($choice==7) {
+  elsif ($choice==8) {
   print(&lt;&lt;END);
-7) Cache Expiration Time: $perlvar{'lonExpire'}
+8) Cache Expiration Time: $perlvar{'lonExpire'}
 ENTER NEW VALUE (in seconds, 86400 is a reasonable value):
 END
     my $choice2=&lt;&gt;;
     chomp($choice2);
     $perlvar{'lonExpire'}=$choice2;
   }
-  elsif ($choice==8) {
+  elsif ($choice==9) {
   print(&lt;&lt;END);
-8) Server Load: $perlvar{'lonLoadLim'}
+9) Server Load: $perlvar{'lonLoadLim'}
 ENTER NEW VALUE:
 END
     my $choice2=&lt;&gt;;
     chomp($choice2);
     $perlvar{'lonLoadLim'}=$choice2;
   }
-  elsif ($choice==9) {
+  elsif ($choice==10) {
   print(&lt;&lt;END);
-9) User Load: $perlvar{'lonUserLoadLim'}
+10) User Load: $perlvar{'lonUserLoadLim'}
 Numer of users that can login before machine is 'overloaded'
 ENTER NEW VALUE (integer value, 0 means there is no limit):
 END
@@ -707,9 +864,9 @@ END
     chomp($choice2);
     $perlvar{'lonUserLoadLim'}=$choice2;
   }
-  elsif ($choice==10) {
+  elsif ($choice==11) {
   print(&lt;&lt;END);
-10) Allow only secure connections: $securestatus 
+11) Allow only secure connections: $securestatus 
 The Lon-CAPA communication daemons lonc and lond can be configured to
 allow only secure connections by default.
 
@@ -736,7 +893,7 @@ END
     }
     ($securestatus,$securenum)=&securesetting(%perlvar);
   }
-  elsif (($choice==11) && (!$error)) {
+  elsif (($choice==12) && (!$error)) {
     $flag=1;
   }
   else {
@@ -747,8 +904,12 @@ END
       die("Cannot output to $confdir$filename\n");
     foreach my $key (keys %perlvar) {
       my $value=$perlvar{$key};
+      my $line = "PerlSetVar     $key      $value";
+      if ($value eq '') {
+          $line = '#'.$line;
+      }
       print(OUT &lt;&lt;END) unless $perlvarstatic{$key};
-PerlSetVar     $key      $value
+$line
 END
     }
     close(OUT);
@@ -761,31 +922,42 @@ unless (-l "<TARGET />") {
   my $hostname=`hostname -f`;chomp($hostname);
   $date=`date -I`; chomp($date);
   $lonHostID=$perlvar{'lonHostID'};
-  $lonHostID=~s/\W//g;
+  $lonHostID=~s/[^\w\-.]//g;
   $lineexistflag=0;
   $hostidexistflag=0;
   $line2insert=&lt;&lt;END;
 $perlvar{'lonHostID'}:$perlvar{'lonDefDomain'}:$perlvar{'lonRole'}:$hostname
 END
-  $domaininsert="$perlvar{'lonDefDomain'}:$domainDescription:$domainTabExtras\n";
+  $domaininsert="$perlvar{'lonDefDomain'}:$domainDescription:$domainTabExtras:$primaryLibServer\n";
   if ($lonCluster eq 'standalone') {
     open(OUT,'&gt;../'.$lonCluster.'_hosts.tab') or
       die('file generation error');
       print(OUT $line2insert);
+      print OUT ("^$hostname\n");
+    close(OUT);
+    open(OUT,'&gt;../'.$lonCluster.'_dns_hosts.tab') or
+      die('file generation error');
+      print(OUT $line2insert);
     close(OUT);
     open(OUT,'&gt;../'.$lonCluster.'_domain.tab') or
       die('file generation error');
       print(OUT $domaininsert);
     close(OUT);
+    open(OUT,'&gt;../'.$lonCluster.'_dns_domain.tab') or
+      die('file generation error');
+      print(OUT $domaininsert);
+    close(OUT);
   }
   if ($flag==1) {
     `rm -f ../hosts.tab`;
-    open(IN,'&lt;../'.$lonCluster.'_hosts.tab');
-    while(&lt;IN&gt;) {
-      if (/^$line2insert$/) {
+    `rm -f ../dns_hosts.tab`;
+    `ln -s ${lonCluster}_dns_hosts.tab ../dns_hosts.tab`;
+    open(IN,'&lt;../'.$lonCluster.'_dns_hosts.tab');
+    while(my $line = &lt;IN&gt;) {
+      if ($line =~ /^\Q$line2insert\E$/) {
         $lineexistflag=1;
       }
-      if (/^$lonHostID\:/) {
+      if ($line =~ /^\Q$lonHostID\E\:/) {
         $hostidexistflag=1;
       }
     }
@@ -793,9 +965,9 @@ END
     if ($hostidexistflag and !$lineexistflag) {
       print &lt;&lt;END;
 WARNING: $lonHostID already exists inside
-loncapa/loncom/${lonCluster}_hosts.tab.  The entry inside
-${lonCluster}_hosts.tab does not match your settings.
-The entry inside ${lonCluster}_hosts.tab is being replaced
+loncapa/loncom/${lonCluster}_dns_hosts.tab.  The entry inside
+${lonCluster}_dns_hosts.tab does not match your settings.
+An entry inside ${lonCluster}_hosts.tab will be made
 with your new values.
 END
       `grep -v "$lonHostID:" ../${lonCluster}_hosts.tab &gt; ../new_${lonCluster}_hosts.tab`;
@@ -809,9 +981,14 @@ END
     }
     elsif ($hostidexistflag and $lineexistflag) {
       print &lt;&lt;END;
-Entry exists in ${lonCluster}_hosts.tab.
+Entry exists in ${lonCluster}_dns_hosts.tab. Making duplicate entry in ${lonCluster}_hosts.tab
 END
-      `ln -s ${lonCluster}_hosts.tab ../hosts.tab`;
+      `grep -v "$lonHostID:" ../${lonCluster}_hosts.tab &gt; ../new_${lonCluster}_hosts.tab`;
+       open(OUT,'&gt;&gt;../new_'.$lonCluster.'_hosts.tab') or
+         die("cannot open loncom/${lonCluster}_hosts.tab for output\n");
+         print(OUT $line2insert);
+       close(OUT);
+      `ln -s new_${lonCluster}_hosts.tab ../hosts.tab`;
       # email appropriate message
       `echo "STABLEUPDATE:$lonCluster:$lonHostID:$date:$line2insert" | mail -s "STABLEUPDATE:$lonCluster:$lonHostID:$date" installrecord\@mail.lon-capa.org`;
     }
@@ -832,12 +1009,14 @@ END
   $lineexistflag=0;
   if ($flag==1) {
     `rm -f ../domain.tab`;
-    open(IN,'&lt;../'.$lonCluster.'_domain.tab');
-    while(&lt;IN&gt;) {
-      if (/^$domaininsert$/) {
+    `rm -f ../dns_domain.tab`;
+    `ln -s ${lonCluster}_dns_domain.tab ../dns_domain.tab`;
+    open(IN,'&lt;../'.$lonCluster.'_dns_domain.tab');
+    while(my $line = &lt;IN&gt;) {
+      if ($line =~/^\Q$domaininsert\E$/) {
         $lineexistflag=1;
       }
-      if (/^$perlvar{'lonDefDomain'}\:/) {
+      if ($line =~/^\Q$perlvar{'lonDefDomain'}\E\:/) {
         $domainexistflag=1;
       }
     }
@@ -845,9 +1024,9 @@ END
     if ($domainexistflag and !$lineexistflag) {
       print &lt;&lt;END;
 WARNING: $perlvar{'lonDefDomain'} already exists inside
-loncapa/loncom/${lonCluster}_domain.tab.  The entry inside
-${lonCluster}_domain.tab does not match your settings.
-The entry inside ${lonCluster}_domain.tab is being replaced
+loncapa/loncom/${lonCluster}_dns_domain.tab.  The entry inside
+${lonCluster}_dns_domain.tab does not match your settings.
+An entry will be made in inside ${lonCluster}_domain.tab
 with your new values.
 END
       `grep -v "$perlvar{'lonDefDomain'}:" ../${lonCluster}_domain.tab &gt; ../new_${lonCluster}_domain.tab`;
@@ -860,10 +1039,15 @@ END
       `echo "REPLACEdom:$lonCluster:$lonHostID:$date:$domaninsert" | mail -s "REPLACEdom:$lonCluster:$lonHostID:$date" installrecord\@mail.lon-capa.org`;
     }
     elsif ($domainexistflag and $lineexistflag) {
+      `grep -v "$perlvar{'lonDefDomain'}:" ../${lonCluster}_domain.tab &gt; ../new_${lonCluster}_domain.tab`;
+       open(OUT,'&gt;&gt;../new_'.$lonCluster.'_domain.tab') or
+         die("cannot open loncom/${lonCluster}_domain.tab for output\n");
+         print(OUT $domaininsert);
+       close(OUT);
       print &lt;&lt;END;
-Entry exists in ${lonCluster}_domain.tab.
+Entry exists in ${lonCluster}_dns_domain.tab. Making duplicate entry in ${lonCluster}_domain.tab
 END
-      `ln -s ${lonCluster}_domain.tab ../domain.tab`;
+      `ln -s new_${lonCluster}_domain.tab ../domain.tab`;
       # email appropriate message
       `echo "STABLEUPDATEdom:$lonCluster:$lonHostID:$date:$domaininsert" | mail -s "STABLEUPDATEdom:$lonCluster:$lonHostID:$date" installrecord\@mail.lon-capa.org`;
     }