[mythtv-users] How does the diskless setup work?

A JM vbtalent at gmail.com
Tue Jun 7 10:49:24 UTC 2005


Paul, excellent write up!

As far as hardware is concerned what are we talking about here? M/B,
ram, video, NIC? What's common for this type of setup?

Since this is run from memory changes to the Myth FE would be
temporary so I assume you modify the 'init script' to make your
modifications to Myth, themes, etc.?

AJM,


On 6/6/05, Paul Bender <pbender at qualcomm.com> wrote:
> Peter Schmitt wrote:
> > Can someone explain to me how the diskless setup works?  I'm guessing
> > it's something along the lines of a ramdisk...  if so, how do you boot
> > into mythtv?
> 
> Diskless systems boot over the network. Just like local boot, network
> boot requires a boot loader, a kernel and a root file system. However,
> in the case of network boot, these are retrieved over the network rather
> than from a local disk.
> 
> The computer must have support for network boot. PXE (Pre-boot eXecution
> Environment) is a common method for supporting network boot.
> 
> When the computer power's up, it uses bootp to obtain an IP address
> along with the location of the boot loader. The location of the boot
> loader consists of a TFTP server IP address and the path to the boot
> loader file on the TFTP server.
> 
> The computer downloads and executes the boot loader. A good PXE boot
> loader is pxelinux <http://syslinux.zytor.com/pxe.php>.
> 
> The boot loader downloads the kernel.
> 
> The boot loader may also download a compressed ram disk image (initrd).
> This image can contain the root file system. If the root file system
> downloaded, then the file system will be in memory.
> 
> The root files system may also be mounted using NFS. In this case, it is
> not necessary to download the root file system.
> 
> The /usr file system may be included in as part of the root file system
> or may be mounted during init. In general, it is easiest to include the
> /usr file system as part of the root file system.
> 
> MythTV and other programs are typically in /usr, so once /usr is
> available, MythTV can be run. In order to make MythTV start
> automatically at boot, xinitrc can be configured to start mythfrontend,
> and xinit can be run as the last step of the init script.
> 
> MiniMyth <http://linpvr.org/forum/viewforum.php?f=8> consists of a
> kernel and a compressed ram file system (cramfs) root file system image.
> The init script included in the root file system starts automatically
> starts MythTV as described above.
> 
> 
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