On Thu, May 05, 2005 at 03:30:46PM -0700, Alvin Oga wrote:
> one script ... change-me-from-slave-to-master.sh and symlinked to "N"
But that system turns out to be harder to keep in sync.
> > What I'd like to do, I think, is have a system that ran as a separate
> > machine, but I could reboot and at the LILO prompt select another
> > configuration that makes it boot with the other machines IPs and
> > config settings.
>
> you cannot tell lilo to boot a remote machine
No, I'm not asking that. I was thinking I could use lilo to boot a
different configuration. I suppose I could use the init scripts to
setup symlinks for /etc/network/interfaces and for all the services I
run. That's basically what I have now -- but I've found it hard to
manage.
So, I was thinking more of a system that uses rsync to keep a copy of
the files that make "master" what it is (a machine with specific IPs,
and a collection of services configured a specific way, and data) on
the "slave" machine. And then have a way to reboot the slave machine
and have it start using the backup data making it act as the master.
if ( running_as("slave") )
ln -s /slave.etc /etc
ln -s /slave.var /var
[...]
else
ln -s /master.etc /etc
ln -s /master.var /var
[...]
Or maybe mount the dirs instead.
Considering /etc/fstab is needed at boot, it's not that easy to place
/etc on a separate partiton (initrd would be one solution, I
suppose), or to symlink late in the boot process.
Perhaps dual-boot would be a good way to go. Boot normally in "slave"
mode and mount partition(s) under /backup and rsync from the master
machine to the slave's /backup/etc, /backup/var, etc. dirs.
Then when there's a failure in master, power down master, and reboot
the slave machine into "master" mode which then mounts that partition
or partitions at /etc, /var, etc.
But, I still don't see that working since the backup of master onto
slave will contain hardware dependent settings that don't work on
slave -- like /etc/fstab. I'm not sure what else (/etc/modules,
perhaps).
I often wonder why there's not two /etc directories -- one for
machine specific settings and another for application settings that
don't really depend on a specific hardware configuration.
> > Any Suggestions?
>
> gazillion ways to do it
Thanks, but I was only looking for one or two.
--
Bill Moseley
[EMAIL PROTECTED]
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