[mythtv-users] Multiple diskless frontends off one image

[diespambox at gmx.net]

diespambox at gmx.net <diespambox at gmx.net> wrote:
> Robin Gilks <g8ecj at gilks.org> wrote:
> > Greetings all
> > 
> > I want to add another frontend, a second diskless Ztoac ION m/b. I'm
> > currently doing a diskless network boot (keeps the noise down) and would
> > like to do the same again for the new frontend which is identical, in
> > hardware terms anyway, but without having to maintain another 2G of image
> > on the main backend/server. Disk space is not the issue, keeping things in
> > sync is!!
> > 
> > I would guess I'd need to have separate /var, /tmp and maybe /etc and
> > /home directories with /usr, /sbin, /opt, /mnt and /lib as common ones.
> > Does this sound reasonable and just how do I do it? (I'm sure someone here
> > has done it before!!). Something has to get the mounts in the right order
> > during boot so I'm hoping this is a wheel I don't have to re-invent :)
> Hi,
> im using a netbooted gentoo, everything except the home directories is
> the same for both frontends. Both Frontends use the same user so i'm
> simply mounting different nfs shares to /home/mythfrontend. Any other
> folders which requiere rw are mounted to tmpfs. 
> The init script is a bit ugly and you could probably do it nicer with
> unionfs or something similar... but it's working...
> 
> 
> I give the kernel this skript in the init= parameter:
> 
> #!/bin/bash
>  ### create ramdisks ###
>  echo "creating ramdisk for /tmp"
>  mount -n -t tmpfs tmpfs /tmp
> 
>  echo "creating ramdisk for /var/lib/init.d"
>  mount -n -t tmpfs tmpfs /var/lib/init.d
>  echo "creating ramdisk for /var/lib/xkb"
>  mount -n -t tmpfs tmpfs /var/lib/xkb
> 
>  echo "creating ramdisk for /var/lib/dbus"
>  mount -n -t tmpfs tmpfs /var/lib/dbus
> 
> 
>  echo "creating ramdisk for /var/log"
>  mount -n -t tmpfs tmpfs /var/log
> 
>  echo "creating ramdisk for /var/run"
>  mount -n -t tmpfs tmpfs /var/run
> 
>  echo "creating ramdisk for /var/lock"
>  mount -n -t tmpfs tmpfs /var/lock
> 
>  echo "creating ramdisk for /var/cache/hald"
>  mount -n -t tmpfs tmpfs /var/cache/hald
> 
>  mkdir -p /var/run/lirc/
>  mount -n -t tmpfs tmpfs /var/run/lirc/
> 
>  echo "creating ramdisk for /root"
>  mount -n -t tmpfs tmpfs /root
>  ### / ###
> 
>  echo "ramdisk for dhcp-client"
>  mount -n -t tmpfs tmpfs /var/lib/dhcp
> 
>  ### create ramdisk for /etc ###
>  echo "saving /etc from NFS-Mount"
>  cd /etc && tar cf /tmp/etc.tar *
> 
> 
>  echo "creating ramdisk for /etc"
>  mount -n -t tmpfs tmpfs /etc
> 
>  echo "populating /etc"
>  tar xf /tmp/etc.tar -C /etc
>  rm /tmp/etc.tar
>  ### / ###
> 
>  echo "Mounting NFS Home"
>  MAC_ETH0=`ifconfig |grep HWaddr| sed s/.*HWaddr\ //`
>  echo "found MAC: " $MAC_ETH0 
>  MOUNT_OPTS="rw,intr,async,nfsvers=3,bg,actimeo=0,tcp"
>  echo "192.168.1.99:/var/gentoo-netboot/homes/home-${MAC_ETH0} /home nfs $MOUNT_OPTS 0 0" >> /etc/fstab
> 
> exec /sbin/init </dev/console >/dev/console 2>&1


just found a quit nice tutorial of what i have done but with a little
more bash kungfu and the use of unionfs :-)

http://wiki.prodigy7.de/mediawiki/index.php?title=Hauptseite/Linux/Gentoo/MythTV-Netboot