TECHNICAL INFO: 

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$Id: TECHNICAL-INFO,v 1.1 2001/11/19 22:59:33 hoerandl Exp $
$Log: TECHNICAL-INFO,v $
Revision 1.1  2001/11/19 22:59:33  hoerandl
initial release

Revision 1.1.1.1  1998/09/21 19:28:56  hoerandl
First Version in CVS

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What happens at startup ?

  BIOS test
  get bootable device (floppy, harddisk, nic)  

    with bootprom:
       send bootp request
       get answer and use this info to setup tcp/ip 

  kernel is loaded

  init starts /etc/rc (actually: sbin/init uses ramdisk/etc/rc)
     unzip ramdisk.gz and mount as a local ramdisk 
   
     start /etc/rc.local
   
       start /etc/rc.inet1
          use bootp to to get info, setup network

       create /etc/hosts, /etc/HOSTNAME etc.
          -> fully working network, local config files created

       use swap partition (if found)

       start rc.disk
         setup local harddisk and filecache (if used)

       start rc.inet2
          mount filesystems
          start inetd, syslog, etc.
   
       sync with time server

       create some directories, setup keyboard and mouse

       start services in /etc/rc.d

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Client filesystem layout 
  explain wired directory structure and links

  [xxxx]    means    Mount Point for xxxx
  a -> b             a is a symbolic link to b
  <text>             what to find here

  watch out: directoies from the server are mounted to local directories which 
             are not empty

  1) at boot time after nfs root is mounted

     / [server:nfsroot]
       boot
       cache
           <copy created with scripts>
       dev -> /ramdisk/dev
       etc -> /ramdisk/etc
       home
          < empty >
       ramdisk
          < original from server >
       ...

  2) /etc/rc
     create and mount ramdisk

    / [server:nfsroot]
       boot
       cache
           <copy created with scripts>
       dev -> /ramdisk/dev
       etc -> /ramdisk/etc
       home
           < empty >
       ramdisk [ /dev/ramdisk ]
           <copy created from ramdisk.gz>
           <the original from the server is hidden>
           etc
              <local configuration>
              <files created at boot time - unique for each client>
              <links to /cache/etc - common config found on server:/etc >
       ...
    
  3) mount disks /etc/rc.disk

  3a) without filecache

    / [server:nfsroot]
       bin -> /cache/bin
       cache [ server:/ ]
           < all data from server >
       dev -> /ramdisk/dev
       etc -> /ramdisk/etc
       home [ server:/home ]
           < home directories for users >
       ramdisk [ /dev/ramdisk ]
           <copy created from ramdisk.gz>
           tmp [ server:/tmp/$HOSTNAME ]
             <temp directory>
       ...
      
       tmp -> ramdisk/tmp
       usr -> /cache/usr

  3b) with filecache  !! not up to date !!
      only changes to 3a) shown

    / [server:nfsroot]
        mnt-all [ server:/ ]
            < all data from server >

        cache [ local harddisk ]
            < cache for data in /mnt-all - done by filecache >

        tmp -> ???
        var -> ???

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 ramdisk-dev 
   contains all needed files in ramdisk/dev - created to allow diffs
   with the next version