Lot of thanks!


Best,

--
Arthur Sherman

+972-52-4878851
http://www.cpt.co.il/

> -----Original Message-----
> From: Platform Independent Linux List!
> [mailto:[log in to unmask]] On Behalf Of Daniel Franke
> Sent: Tuesday, March 06, 2007 1:27 AM
> To: [log in to unmask]
> Subject: Re: /dev/shm
>
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> On Sun, Mar 04, 2007 at 11:29:44PM +0200, Arthur Sherman wrote:
> > This is a bit farer than I ment to go :) , but it sounds
> interesting.
> > I'll give it a try in my leisure time.
> >
> > BTW, how changes, such as to mysql db or new virus defs,
> would be saved in
> > this image?
> > How do you create such image and load it at a boot time?
>
> For the database you can use MySQL Cluster:
>
> http://mysql.com/products/database/cluster
>
> You build a network of database servers which operate
> strictly out of main
> memory, with automatic failover if some servers go down.
> Obviously you
> should make occasional backups in case they all go down at once.
>
> For virus defs, have your bootscripts download and install the latest
> definitions when you boot up. Start over with a new image
> when the download
> gets unwieldly.
>
> To set it all up:
>
> 1. Create and mount a loopback filesystem that's no bigger
> than your RAM.
>
> 2. Do a minimal install of your favorite distro onto the loopback
> FS (use debootstrap for Debian or something analogous for others
> distros) plus whatever software you need to run on the server.
>
> 3. Chroot into it, configure everything the way you want it,
> and add the
> logic I mentioned above into the boot scripts.
>
> 4. Set up an initrd which creates a ramdisk (this is
> different from tmpfs,
> see /usr/src/linux/Documentation/ramdisk.txt) the same size
> as your loopback
> fs, dds the loopback image onto the ramdisk, mounts it, and
> then pivot_roots
> to it.
>
> 5. Add an appropriate initrd= option to your kernel command line.
>
> This will all take some doing! Don't expect much help from
> your distro.
> I suggest using Slackware because it will stay out of your
> way. You might
> want to practice all this in VMWare before you start ripping
> the guts out
> of a production box.
>
> - --
> Daniel Franke [log in to unmask] http://www.dfranke.us
> |----| =|\ \\\\
> || * | -|-\--------- Man is free at the instant he wants to be.
> - -----| =| \ /// --Voltaire
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