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LDP/howto/docbook/Beowulf-HOWTO.xml

@@ -193,7 +193,8 @@
     to communicate between nodes. Here is a rule: If the manual tells you to
     do something, DO IT! The lam manual also tells you to run as a non-root
     user. Make the same user for every box. Build every box on the cluster
-    with the same user “wolf” with the same password.</para>
+    with that same user and password. I named that non root user "wolf".
+    </para>
 
     <sect2>
       <title>Hosts</title>
@@ -286,20 +287,14 @@ cat &gt;&gt; exports
       <para>Make sure that services we want are up:</para>
 
       <screen>chkconfig -add sshd 
-chkconfig -add telnet 
 chkconfig -add nfs 
 chkconfig -add rexec 
 chkconfig -add rlogin 
 chkconfig -level 3 rsh on 
-chkconfig -level 3 telnet on 
 chkconfig -level 3 nfs on 
 chkconfig -level 3 rexec on 
 chkconfig -level 3 rlogin on</screen>
 
-      <para>Telnet? I added this just as a convenience. It is not needed but
-      it is nice to have while debugging nfs. How are you going to log into a
-      box if you can’t ssh to the box?</para>
-
       <para>…And, during startup, I saw some services that I know I don’t
       want, and in my opinion, could be removed. You may add or remove others
       that suit your needs; just include the ones shown above.</para>
@@ -380,7 +375,7 @@ ssh-agent sh -c ‘ssh-add &amp;&amp; bash’</screen>
       describe that; I just got the source and followed the directions, and in
       another experiment I installed their rpm. Both of them worked fine.
       Remember the whole reason we are doing this is to learn; go forth and
-      learn. </para>
+      learn.</para>
 
       <para>You may also read more documentation regarding LAM and other
       message passing interface software <ulink
@@ -392,7 +387,7 @@ ssh-agent sh -c ‘ssh-add &amp;&amp; bash’</screen>
     <title>Set Up Slave Nodes</title>
 
     <para>Get your network cables out. Install Linux on the first non-head
-    node.</para>
+    node. Follow these steps for each non-head node.</para>
 
     <sect2>
       <title>Base Linux Install</title>
@@ -574,15 +569,16 @@ Added linux * </screen>
     <para>All done! You are almost ready to start wolfing.</para>
 
     <para>Reboot your boxes. Did they all come up? Can you ping the head node
-    from each box? Can you ping each node from the head node? Can you telnet?
-    Can you ssh? Don’t worry about doing ssh as root; only as wolf.</para>
+    from each box? Can you ping each node from the head node? Can you ssh?
+    Don’t worry about doing ssh as root; only as wolf. Also only worry about
+    ssh from the head to the slave, not the other way around.</para>
 
     <para>If you are logged in as wolf, and ssh to a box, does it go
     automatically, without prompting for password?</para>
 
     <para>After the node boots up, log in as wolf, and say “mount”. Does it
     show wolf00:/mnt/wolf mounted? On the head node, copy a file into
-    /mnt/wolf. Can you read and write that file from the node box?</para>
+    /mnt/wolf. Can you read and write that file from the slave node?</para>
 
     <para>This is really not required; it is merely convenient to have a
     common directory reside on the head node. With a common shared directory,