Syslinux - Aug 2015 - Looking for ways to save space - AKA how to boot multiple machines from the same root

I have several machines, same hardware and config, but one tiny little
change.. the hostname. Each one of these diskless machines needs its own
hostname.

Presently my pxelinux.cfg is setup like:

prompt 1

default Gentoo

timeout 10

 

label Gentoo

kernel boot/kernel-3.16.5-gentoo

APPEND root=/dev/nfs rw ip=dhcp
nfsroot=192.168.1.10:/RAID/diskless/XXXXX-mythtv-0.27-fixes,tcp,rsize=131072
,wsize=131072,nfsvers=3

Where the XXXXX is the hostname. Because I have 3 of these machines I am
using up 3 times the disk space.

I am wondering if there is a way all 3 of them can run from the same
nfsroot, but somehow have different hostnames/machine-ids.

Presently the hostname comes from /RAID/diskless/XXXXX
-mythtv-0.27-fixes/etc/conf.d/hostname and the machine-id from
/RAID/diskless/XXXXX -mythtv-0.27-fixes/etc/machine-id and these are the
only 2 differing files from machine to machine.

 

Marc

Yes it is possible. Not sure why you posted this to syslinux though. 


     On Monday, August 24, 2015 10:46 PM, Marc Tousignant via Syslinux
<syslinux at zytor.com> wrote:
   

 I have several machines, same hardware and config, but one tiny little
change.. the hostname. Each one of these diskless machines needs its own
hostname.

Presently my pxelinux.cfg is setup like:

prompt 1

default Gentoo

timeout 10

 

label Gentoo

kernel boot/kernel-3.16.5-gentoo

APPEND root=/dev/nfs rw ip=dhcp
nfsroot=192.168.1.10:/RAID/diskless/XXXXX-mythtv-0.27-fixes,tcp,rsize=131072
,wsize=131072,nfsvers=3

Where the XXXXX is the hostname. Because I have 3 of these machines I am
using up 3 times the disk space.

I am wondering if there is a way all 3 of them can run from the same
nfsroot, but somehow have different hostnames/machine-ids.

Presently the hostname comes from /RAID/diskless/XXXXX
-mythtv-0.27-fixes/etc/conf.d/hostname and the machine-id from
/RAID/diskless/XXXXX -mythtv-0.27-fixes/etc/machine-id and these are the
only 2 differing files from machine to machine.

 

Marc

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Because everything I searched on for a PXELinux mailing list pointed me to here.
And because PXELinux is a derivative of SYSLinux. If there is a better mailing
list for my questions, please let me know.

 

Since you say its possible, care to enlighten me on how to do so?

 

Marc

 

From: Don Cupp [mailto:doncuppjr at yahoo.com] 
Sent: Tuesday, August 25, 2015 10:58 AM
To: Marc Tousignant <myrdhn at gmail.com>; syslinux at zytor.com
Subject: Re: [syslinux] Looking for ways to save space - AKA how to boot
multiple machines from the same root

 

Yes it is possible. Not sure why you posted this to syslinux though.

 

 

On Monday, August 24, 2015 10:46 PM, Marc Tousignant via Syslinux <syslinux
at zytor.com <mailto:syslinux at zytor.com> > wrote:

 

I have several machines, same hardware and config, but one tiny little
change.. the hostname. Each one of these diskless machines needs its own
hostname.

Presently my pxelinux.cfg is setup like:

prompt 1

default Gentoo

timeout 10



label Gentoo

kernel boot/kernel-3.16.5-gentoo

APPEND root=/dev/nfs rw ip=dhcp
nfsroot=192.168.1.10:/RAID/diskless/XXXXX-mythtv-0.27-fixes,tcp,rsize=131072
,wsize=131072,nfsvers=3

Where the XXXXX is the hostname. Because I have 3 of these machines I am
using up 3 times the disk space.

I am wondering if there is a way all 3 of them can run from the same
nfsroot, but somehow have different hostnames/machine-ids.

Presently the hostname comes from /RAID/diskless/XXXXX
-mythtv-0.27-fixes/etc/conf.d/hostname and the machine-id from
/RAID/diskless/XXXXX -mythtv-0.27-fixes/etc/machine-id and these are the
only 2 differing files from machine to machine.



Marc

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