Project

General

Profile

1 878 berkley
<!--
2
  * replication.html
3
  *
4
  *      Authors: Chad Berkley
5
  *    Copyright: 2000 Regents of the University of California and the
6
  *               National Center for Ecological Analysis and Synthesis
7
  *  For Details: http://www.nceas.ucsb.edu/
8
  *      Created: 2001 January 23
9
  *      Version:
10
  *    File Info: '$ '
11
  *
12
  *
13
-->
14
<HTML>
15
<HEAD>
16 4496 daigle
<TITLE>Metacat Replication</TITLE>
17 4556 daigle
<link rel="stylesheet" type="text/css" href="./common.css">
18 3780 daigle
<link rel="stylesheet" type="text/css" href="./default.css">
19 878 berkley
</HEAD>
20
<BODY>
21
  <table width="100%">
22
    <tr>
23
      <td class="tablehead" colspan="2"><p class="label">Replication</p></td>
24
      <td class="tablehead" colspan="2" align="right">
25
        <a href="./packages.html">Back</a> | <a href="./metacattour.html">Home</a> |
26
        <a href="./datafiles.html">Next</a>
27
      </td>
28
    </tr>
29
  </table>
30 4482 daigle
31
  <div class="header1">Table of Contents</div>
32
  <div class="toc1"><a href="#Intro">Metacat Replication</a></div>
33 4496 daigle
    <div class="toc2"><a href="#Overview">Overview</a></div>
34 4482 daigle
    <div class="toc2"><a href="#DatabasedInfo">Databased Information</a></div>
35
    <div class="toc2"><a href="#Example">Example</a></div>
36
      <div class="toc3"><a href="#gamma">What happens with gamma?</a></div>
37
      <div class="toc3"><a href="#alpha">What happens with alpha?</a></div>
38
      <div class="toc3"><a href="#lamda">What happens with lamda?</a></div>
39 4496 daigle
  <div class="toc1"><a href="#ControlPanel">The Replication Control Panel</a></div>
40 4482 daigle
  <div class="toc1"><a href="#Certificates">Certificates</a></div>
41
    <div class="toc2"><a href="#GenerateCertificates">Generate Certificates on both the replication client and server.</a></div>
42
      <div class="toc3"><a href="#GenerateCertTomcat">Generate Certificate for Tomcat standalone (no Apache)</a></div>
43
      <div class="toc3"><a href="#GenerateCertApache">Generate Certificate for Apache/Tomcat</a></div>
44
    <div class="toc2"><a href="#RegisterPartner">Register the partner machines certificate</a></div>
45
46
  <a name="Intro"></a><div class="header1">Metacat Replication</div>
47 4496 daigle
  <a name="Overview"></a><div class="header2">Overview</div>
48 4482 daigle
  <p>Metacat has built-in replication to allow different Metacat servers to
49
  share data between themselves. Metacat not only replicates XML documents but
50
  also data files. </p>
51
52
  <p>Metacat's hub feature allows it to replicate not only it's own server's original
53
  documents, but also those that were replicated from other servers.  This functionality
54
  allows for a more complex chaining replication structure.</p>
55
56 1302 tao
  <p>The replication scheme that Metacat uses is both push and pull.  There are
57 4482 daigle
  several triggers that can start a replication mechanism: </p>
58
  <ul class="list1">
59
    <li><b>Delta-T monitoring</b> - at a set time interval a server checks each of the
60 878 berkley
    other servers in its list for updated documents</li>
61 4482 daigle
    <li><b>INSERT trigger</b> - Whenever a document is inserted, the server notifies
62 878 berkley
    the remote hosts in its list that it has a new file available.</li>
63 4482 daigle
    <li><b>UPDATE trigger</b> - Whenever a document is updated, the server notifies
64 878 berkley
    each server in its list of the update.</li>
65 4482 daigle
    <li><b>File locking</b> - When a local user tries to alter a document on a local
66 878 berkley
    server that belongs to a remote server, the local server must first
67
    obtain a lock on that file.  Once the lock is obtained, the file can
68
    be updated, then it is force replicated out to each server in the list.
69
    The lock ensures that the remote copy is up to date and that an older
70
    file does not overwrite a newer one.  Only a documents home server
71
    can give a lock for that file to be altered.</li>
72
  </ul>
73 4482 daigle
74
  <a name="DatabasedInfo"></a><div class="header2">Databased Information</div>
75 878 berkley
  <p>Each server contains a list of servers to which it can replicate.  One-way
76 1302 tao
  replication is enabled by the 'replicate' and 'datareplicate' flags in the
77
  list.  The server list may look like the following.</p>
78 878 berkley
  <table border="1">
79
    <tr>
80
      <td><b>serverid</b></td>
81
      <td><b>server</b></td>
82
      <td><b>last_checked</b></td>
83
      <td><b>replicate</b></td>
84 1302 tao
      <td><b>datareplicate</b></td>
85
      <td><b>hub</b></td>
86 878 berkley
    </tr>
87
    <tr>
88
      <td>1</td>
89
      <td>localhost</td>
90
      <td>null</td>
91
      <td>0</td>
92 1302 tao
      <td>0</td>
93
      <td>0</td>
94 878 berkley
    </tr>
95
    <tr>
96
      <td>2</td>
97
      <td>alpha.nceas.ucsb.edu:8080/berkley/servlet/replication</td>
98
      <td>2001-01-22 14:52:12.1</td>
99 1302 tao
      <td>0</td>
100
      <td>0</td>
101
      <td>0</td>
102 878 berkley
    </tr>
103
    <tr>
104
      <td>3</td>
105
      <td>dev.nceas.ucsb.edu/Metacat/servlet/replication</td>
106
      <td>2001-01-23 9:10:02.5</td>
107
      <td>1</td>
108 1302 tao
      <td>1</td>
109
      <td>0</td>
110 878 berkley
    </tr>
111
  </table>
112
113 4482 daigle
  <br>
114
  The server list is kept in a table in the database called xml_replication.
115 878 berkley
  Localhost must always be the first entry in the table and have a serverid of 1.
116 4482 daigle
  The database fields are:
117
  <ul class="list1">
118
  <li><b>serverid</b> - a unique ID that is generated by the database when a new field is added.</li>
119
  <li><b>server</b> - this field always points to the partner server's replication servlet,
120
  hence the "servlet/replication" on the end of both of the sample servers.  Note
121 878 berkley
  that any port numbers (if your servlet engine is not running on port 80) must
122 4482 daigle
  also be included. </li>
123
  <li><b>last_checked</b> - a system generated values that holds the last time that a check was
124
  made to see if replication needed to be performed.<li>
125
  <li><b>replicate</b> - flag that is set to 1 if you want this server to replicate XML
126
  metadata documents TO the remote host.  Note that if this flag is set to 0, datareplicate
127
  and hub fields have no meaning.</li>
128
  <li><b>datareplicate</b> - flag that is set to 1 if you want this server to copy data
129
  files to the remote host.  Note that this field has no meaning if replicate is not set to 1.</li>
130
  If this server is a hub to the remote host, the hub flag should be set to.
131
  <li><b>hub</b> - if this flag is set to true, this server will not only replicate it's own
132
  original documents, it will also replicate documents that were replicated to it.  Thus it
133
  acts as a replication hub to one or more other Metacat servers.</li>
134
  </ul>
135
136
  <a name="Example"></a><div class="header2">Example</div>
137
  Here we show an example setup of three replication servers.  We will discuss each.<br><br>
138
139
  First, note that in order for replication to occur, both partner servers must have
140
  each other in their respective tables or replication will not take place.  Also,
141
  certificates must be set up correctly on both servers in order for replication to
142
  work.  See the <a href="#Certificates">certificates</a> section below.<br><br>
143
144 878 berkley
  <table border="1">
145
    <tr>
146
      <td>host</td>
147
      <td>replication table</td>
148
    </tr>
149
    <tr>
150 4482 daigle
     <td>gamma.nceas.ucsb.edu</td>
151 878 berkley
     <td>
152
      <table border="2">
153
        <tr>
154
          <td><b>server</b></td>
155
          <td><b>last_checked</b></td>
156
          <td><b>replicate</b></td>
157 1302 tao
          <td><b>datareplicate</b></td>
158
          <td><b>hub</b></td>
159 878 berkley
        </tr>
160
        <tr>
161
          <td>localhost</td>
162
          <td>null</td>
163
          <td>0</td>
164 1302 tao
          <td>0</td>
165
          <td>0</td>
166 878 berkley
        </tr>
167
        <tr>
168
          <td>alpha.nceas.ucsb.edu:8080/berkley/servlet/replication&nbsp;&nbsp;&nbsp;</td>
169
          <td>2001-01-22 14:52:12.1</td>
170 1302 tao
          <td>0</td>
171
          <td>0</td>
172
          <td>0</td>
173 878 berkley
        </tr>
174
        <tr>
175 4482 daigle
          <td>lamda.nceas.ucsb.edu/Metacat/servlet/replication</td>
176 878 berkley
          <td>2001-01-23 9:10:02.5</td>
177
          <td>1</td>
178 1302 tao
          <td>1</td>
179
          <td>0</td>
180 878 berkley
        </tr>
181
      </table>
182
     </td>
183
    </tr>
184
    <tr>
185
      <td>alpha.nceas.ucsb.edu</td>
186
      <td>
187
        <table border="2">
188
          <tr>
189
            <td><b>server</b></td>
190
            <td><b>last_checked</b></td>
191
            <td><b>replicate</b></td>
192 1302 tao
            <td><b>datareplicate</b></td>
193
            <td><b>hub</b></td>
194 878 berkley
          </tr>
195
          <tr>
196
            <td>localhost</td>
197
            <td>null</td>
198
            <td>0</td>
199 1302 tao
            <td>0</td>
200
            <td>0</td>
201 878 berkley
          </tr>
202
          <tr>
203 4482 daigle
            <td>gamma.nceas.ucsb.edu:8080/berkley/servlet/replication</td>
204 878 berkley
            <td>2001-01-21 11:33:12.7</td>
205
            <td>0</td>
206 1302 tao
            <td>1</td>
207
            <td>0</td>
208 878 berkley
          </tr>
209
          <tr>
210 4482 daigle
            <td>lamda.nceas.ucsb.edu/Metacat/servlet/replication</td>
211 878 berkley
            <td>2001-01-23 10:22:02.5</td>
212
            <td>1</td>
213 1302 tao
            <td>0</td>
214
            <td>0</td>
215 878 berkley
          </tr>
216
        </table>
217
      </td>
218
    </tr>
219
    <tr>
220 4482 daigle
      <td>lamda.nceas.ucsb.edu</td>
221 878 berkley
      <td>
222
        <table border="2">
223
          <tr>
224
            <td><b>server</b></td>
225
            <td><b>last_checked</b></td>
226
            <td><b>replicate</b></td>
227 1302 tao
            <td><b>datareplicate</b></td>
228
            <td><b>hub</b></td>
229 878 berkley
          </tr>
230
          <tr>
231
            <td>localhost</td>
232
            <td>null</td>
233
            <td>0</td>
234 1302 tao
            <td>0</td>
235
            <td>0</td>
236 878 berkley
          </tr>
237
          <tr>
238 4482 daigle
            <td>gamma.nceas.ucsb.edu:8080/berkley/servlet/replication</td>
239 878 berkley
            <td>2001-01-21 11:33:12.7</td>
240
            <td>0</td>
241 1302 tao
            <td>0</td>
242
            <td>0</td>
243 878 berkley
          </tr>
244
          <tr>
245
            <td>alpha.nceas.ucsb.edu:8080/Metacat/servlet/replication</td>
246
            <td>2001-01-22 12:15:32.5</td>
247
            <td>1</td>
248 1302 tao
            <td>1</td>
249
            <td>1</td>
250 878 berkley
          </tr>
251
        </table>
252
      </td>
253
    </tr>
254
  </table>
255 4482 daigle
256
  <a name="gamma"></a><div class="header3">What happens with gamma?</div>
257
  <ul class="list1">
258
  <li>The localhost entry is required internally for replication to work on
259
      gamma.  As long as we see it there, we can safely disregard it.</li>
260
  <li>We see the entry for the alpha machine has all zeros in replicate,
261
      datareplicate and hub columns.  This means that gamma is configured to
262
      accept replication information from alpha.  (As we will see in a moment,
263
      alpha is not actually correctly configured to send data to gamma.)</li>
264
  <li>We see that the entry for the lamda machine has ones in the replicate
265
      and data replicate columns and a zero in the hub column.  This tells us
266
      that gamma will replicate it's original documents to lamda, assuming that
267
      lambda is configured to accept replication from gamma (we will see that it
268
      is).  However, because the hub value is zero, any documents that replicate
269
      to gamma will not be further replicated to lamda.</li>
270
  </ul>
271
272
  <a name="alpha"></a><div class="header3">What happens with alpha?</div>
273
  <ul class="list1">
274
  <li>The localhost entry is required internally for replication to work on
275
      alpha.  As long as we see it there, we can safely disregard it.</li>
276
  <li>We see that the entry for gamma has a zero in the replicate column.
277
      This means that all other entries are meaningless and can be disregarded.
278
      Even though there is a one in the datareplicate column on alpha and gamma
279
      is configured to accept replication from alpha, no replicationwill happen
280
      from alpha to gamma.</li>
281
  <li>We see that the entry for lamda is a one in the replicate column and zeros
282
      in the datareplicate and hub columns.  Assuming lamda is configured to
283
      accept replication from alpha, alpha will replicate metadata only to lamda
284
      (and indeed, we will see that lambda is set up to accept replication from
285
      alpha). </li>
286
  </ul>
287
288
  <a name="lamda"></a><div class="header3">What happens with lamda?</div>
289
  <ul class="list1">
290
  <li>The localhost entry is required internally for replication to work on
291
      lamda.  As long as we see it there, we can safely disregard it.</li>
292
  <li>We see that the entry for gamma has all zeros in replicate, datareplicate
293
      and hub, so lamba is set up to accept replication from gamma.  As we have
294
      already seen, gamma is correctly configured to replicate metadata and data
295
      to lambda.  We should see data and metadata replication from gamma to lamda.
296
  <li>We see that the entry for alpha has ones in the replicate datareplicate and
297
      hub columns.  There's a lot going on here:
298
    <ul class="list2">
299
    <li>First, lamda will replicate original metadata and data to alpha if
300
        alpha is configured to accept replication from lamda.  Because alpha
301
        has an entry for lambda, lamba will be allowed to replicate to alpha. </li>
302
    <li>Second, because the alpha entry has a one in the hub column, lambda
303
        will not only replicate it's original data, it will also replicate
304
        data that was replicated to it.  Remember that gamma was configured
305
        to replicate to lamda.  So any data or metadata that gamma sends to
306
        lambda will get further replicated to alpha.</li>
307
    <li>Finally, the alpha entry in the table allows the alpha server to
308
        replicate to lambda.  Since the alpha server is set up to replicate
309
        metadata only, we would expect any original metadata on alpha to
310
        wind up on lambda.</li>
311
    </ul>
312
  </ul>
313 4496 daigle
314
<a name="ControlPanel"></a><div class="header1">The Replication Control Panel:</div>
315 4482 daigle
  There is an html control panel for controling replication.  After
316 4808 daigle
  installing Metacat, you can access it by calling replControl.html.  For instance, if you
317
  setup a Metacat application context called 'knb' you would probably type :
318 4482 daigle
319 4808 daigle
  <div class="code">http://server.domain.com/knb/style/skins/dev/replControl.html</div>
320 4482 daigle
321
  The control panel is an easy interface for adding/removing/altering servers and
322
  starting the delta-T handler.  It will also allow you to 'force replicate' your
323
  server list.  This is useful if you want to initialize the state of one Metacat
324
  server from an existing state of another (i.e. copy all of the data from an existing
325 878 berkley
  server).</p>
326
327 4482 daigle
  <a name="Certificates"></a><div class="header1">Certificates:</div>
328
  You will need to generate security certificates on both the replication client
329
  and server.  The certificates will be exchanged so that each machine understands
330
  that the other has access for replication.<br><br>
331
  The following are the steps to generate and exchange certificates on systems
332
  running Tomcat 5 and java 1.5.  Note that if Tomcat is running in conjunction with
333
  Apache, the process is somewhat different than if it is running standalone.
334
335
  <a name="GenerateCertificates"></a><div class="header2">Generate Certificates on both the replication client and server.</div>
336
337
  <a name="GenerateCertTomcat"></a><div class="header3">Generate Certificate for Tomcat standalone (no Apache)</div>
338
  <ul class="list1">
339
  <li>Generate keys in java default key store - this will create a secure key and put it
340
    into the binary certificates file located at $JAVA_HOME/lib/security/cacerts</li>
341
    <ul class="list2">
342
    <li>Run the command:
343 4496 daigle
   	  <div class="code">keytool -genkey -alias &lt;aliasname&gt; -keyalg RSA -validity 800 -keystore $JAVA_HOME/lib/security/cacerts</div>
344 4482 daigle
     where &lt;aliasname&gt; is a unique name that you choose for this cert.  Something like "&lt;hostname-tomcat&gt"
345 4496 daigle
     might be appropriate, where &lt;hostname-tomcat&gt is the name of this host.</li>
346 4482 daigle
    </ul>
347
  </li>
348 4496 daigle
  <li>
349
    Password - keytool will ask for a password.  If this is a pre-existing keystore, you will need
350
    to know its password to modify it.  If you are creating a new keystore, the password you enter
351
    will become the keystore password.
352
  </li>
353 4482 daigle
  <li>Sample values when creating certificate</li>
354
    <ul class="list2">
355
    <li>What is your first and last name? <b>myserver.nceas.ucsb.edu </b>
356
        (note: use the host name without port number)<li>
357
    <li>What is the name of your organizional unit? <b>NCEAS</b></li>
358
    <li>What is the name of your organizional unit? <b>UCSB</b></li>
359
    <li>What is the name of your City or Locality? <b>Santa Barbara</b></li>
360
    <li>What is the name of your State or Province? <b>California</b>
361
        (note: this is spelled in full)<li>
362
    <li>What is the two-letter country code for this unit? <b>US</b></li>
363
    </ul>
364
  <li>Generate certificate - this will pull the certificate you created from the cacerts file
365
      and put it into a local file</li>
366
    <ul class="list2">
367
    <li>Run the command:
368 4496 daigle
      <div class="code">keytool -export -alias &lt;aliasname&gt; -file &lt;outputfile&gt;.cert -keystore $JAVA_HOME/lib/security/cacerts</div>
369 4482 daigle
      where &lt;aliasname&gt; is the same name you used when you created the certificate.  </li>
370
    <li>A file named &lt;outputfile&gt;.cert will be created in the same directory where you run the keytool
371
      command.  You can name the output file anything you like, but keep in mind that it will get sent to the
372
      partner machine used for replication.  The filename should have have enough meaning that someone who sees
373
      it on that machine can have some idea where it came from.  Again, something like "&lt;hostname&gt;-tomcat.cert"
374
      will suffice.</li>
375
    </ul>
376
  </li>
377
  <li>Enable SSL in Tomcat
378
    <ul class="list2">
379
    <li>Edit the Tomcat server file at $TOMCAT_HOME/conf/server.xml</li>
380 4496 daigle
    <li>
381
      uncomment the section that starts with "&lt;Connector port="8443" ... (Note: Databased Informationcomments start with
382
      &lt;!-- and end with --&gt;).
383
    </li>
384
  	<li>add two attribute to that section that read:
385 4482 daigle
  	  <div class="code">keystoreFile="&lt;JAVA_HOME&gt;/lib/security/cacerts"</div>
386 4496 daigle
  	  <div class="code">keystorePass="&lt;keystore_password&gt;"</div>
387
  	  where &lt;JAVA_HOME&gt; should be the actual java path and &lt;keystore_password&gt; should be the
388
  	  password you used when you created the keystore.
389 4482 daigle
  	</li>
390
  	</ul>
391
  </li>
392
  </ul>
393
394
  <a name="GenerateCertApache"></a><div class="header3">Generate Certificate for Apache/Tomcat</div>
395
  <ul class="list1">
396
  <li>Generate keys using openssl
397
    <ul class="list2">
398
    <li>Run the command:
399
   	  <div class="code">   openssl req -new -out REQ.pem -keyout &lt;hostname&gt;-apache.key</div>
400
    </li>
401
    </ul>
402
  </li>
403
  <li>Sample values when creating certificate</li>
404
    <ul class="list2">
405 4808 daigle
    <li>Enter PEM pass phrase: (note: I use the first part of the host name)
406 4482 daigle
    <li>Country Name (2 letter code) [AU]: <b>US</b></li>
407
    <li>State or Province Name (full name) [Some-State]: <b>California</b>
408
        (note: this is spelled in full)</li>
409
    <li>Locality Name (eg, city) []: <b>Santa Barbara</b></li>
410 4808 daigle
    <li>Organization Name (eg, company) [Internet Widgits Pty Ltd]: <b>UCSB</b></li>
411 4482 daigle
    <li>Organizational Unit Name (eg, section) []: <b>NCEAS</b></li>
412
    <li>Common Name (eg, YOUR name) []: <b>myserver.mydomain.edu</b>
413
        (note: use the host name without port number)</li>
414
    <li>Email Address []:  <b>administrator@mydomain.edu</b></li>
415
    <li>A challenge password []: (note: leave blank)</li>
416
    <li>An optional company name []: (note: leave blank)</li>
417
    </ul>
418
  </li>
419
  <li>Generate certificate - this will create a local file with your certificate</li>
420
    <ul class="list2">
421
    <li>Run the command:
422
      <div class="code">openssl req -x509 -days 800 -in REQ.pem -key &lt;hostname&gt;-apache.key -out &lt;hostname&gt;-apache.crt</div>
423 4808 daigle
      where &lt;hostname&gt; is the same name you used when you created the certificate.  </li>
424
    <li>A file named &lt;hostname&gt;-apache.crt will be created in the same directory where you run the keytool
425 4482 daigle
      command.  You can name the output file anything you like, but keep in mind that it will get sent to the
426
      partner machine used for replication.  The filename should have have enough meaning that someone who sees
427 4808 daigle
      it on that machine can have some idea where it came from.  Again, something like "&lt;hostname&gt;-apache.crt"
428 4482 daigle
      will suffice.</li>
429
    </ul>
430
  </li>
431
  <li>Enter the certificate into apache security configuration - you need to register the certificate
432
      in the local Apache instance.  Note that the security files may be in a different place depending
433
      on how you installed apache.</li>
434
    <ul class="list2">
435
    <li>Copy the certificate and key file to the apache ssl directories and enable ssl.</li>
436
    <li>For Ubuntu/Debian based systems:
437
      <ul class="list3">
438
      <li>sudo cp &lt;hostname&gt;-apache.crt /etc/ssl/certs</li>
439
      <li>sudo cp &lt;hostname&gt;-apache.key /etc/ssl/private</li>
440
      <li>As root edit /etc/apache2/sites-available/default.  In the VirtualHost section
441
          after the DocumentRoot line, add:<br>
442
          SSLEngine on<br>
443
          SSLOptions +FakeBasicAuth +ExportCertData +CompatEnvVars +StrictRequire<br>
444
          SSLCertificateFile /etc/ssl/certs/server.crt<br>
445
          SSLCertificateKeyFile /etc/ssl/private/server.key<br>
446
      </li>
447
      </ul>
448
    </li>
449
    </ul>
450
    <ul class="list2">
451
    <li>For other systems:
452
      <ul class="list3">
453
      <li>sudo cp &lt;hostname&gt;-apache.crt $APACHE_HOME/conf/ssl.crt</li>
454
      <li>sudo cp &lt;hostname&gt;-apache.key $APACHE_HOME/conf/ssl.key</li>
455
      <li> ADD STEPS TO ENABLE SSL ON NON_DEBIAN SYSTEMS HERE</li>
456
      </ul>
457
    </li>
458
    </ul>
459
  <li>scp &lt;hostname&gt;-apache.crt to the replication partner machine.</li>
460
  </ul>
461
462
  <a name="RegisterPartner"></a><div class="header2">Register the partner machines certificate.</div>
463
  At this point, you have created a certificate for each replication server and
464
  scp-ed them across to each other.  Now you need to import the remote server's
465
  certificate on the local machine.  Perform the following steps for each
466
  replication server.
467
  <ul class="list1">
468
  <li>Import the remote certificate by running:
469 4808 daigle
    <div class="code">keytool -import -alias &lt;remotehostalias&gt; -file &lt;remotehostfilename&gt;.crt -keystore $JAVA_HOME/jre/lib/security/cacerts</div>
470 4482 daigle
    where the &lt;remotehostfilename&gt; is the certificate file you created on the remote machine and
471
    copied to this machine.  The &lt;remotehostalias&gt; is the name the certificate will use in
472
    the keystore.  It should be something that identifies the remote host.
473
  </li>
474
  <li>Restart Apache and Tomcat on both replication machines</li>
475
  </ul>
476
477 878 berkley
  <a href="./packages.html">Back</a> | <a href="./metacattour.html">Home</a> |
478
  <a href="./datafiles.html">Next</a>
479 4482 daigle
  </ul>
480 878 berkley
481
482
</BODY>
483
</HTML>