6:21 p.m.
Hi all,
I need to boot a livecd on some hard disk less clients. I tried to use
livecd-iso-to-pxe, but in my case it unacceptable to load the whole iso
into initrd (the iso is not small).
I made a custom livecd adding dracut-network package, I mounted
squashfs/root image, exported with nfs, and I've tried to boot the clients
with root=nfs:192.168.1.50:/home/frafra/root/ selinux=0, but Fedora gives
me many errors because it can't write on it.
I found this old thread
http://comments.gmane.org/gmane.linux.redhat.fedora.livecd/4261 but it
doesn't work for me.
Is there a way to get a livecd behaviour with this nfs directory? Or can I
combine the isolinux.cfg livecd options with
root=nfs:192.168.1.50:/home/frafra/
(where it could found the iso or the mounted iso)?
I'm using dnsmasq with its internal tftp server, which gives vmlinuz0 and
initrd0.img (copied from livecd), pxelinux.0 and a configuration file with
the above root=nfs:[...] selinux=0 options.
Thanks,
Francesco Frassinelli
4:50 a.m.
On Mon, Nov 21, 2011 at 1:21 AM, Francesco Frassinelli
<fraph24(a)gmail.com> wrote:
Hi all,
I need to boot a livecd on some hard disk less clients. I tried to use
livecd-iso-to-pxe, but in my case it unacceptable to load the whole iso into
initrd (the iso is not small).
I made a custom livecd adding dracut-network package, I mounted
squashfs/root image, exported with nfs, and I've tried to boot the clients
with root=nfs:192.168.1.50:/home/frafra/root/ selinux=0, but Fedora gives me
This tried to use it as normal rootfs, try livenet dracut module,
which handles remote livecd iso:
git.kernel.org/?p=boot/dracut/dracut.git;a=blob;f=modules.d/90livenet/liv...
Alan
6:01 a.m.
2011/11/21 Alan Pevec <apevec(a)gmail.com>
On Mon, Nov 21, 2011 at 1:21 AM, Francesco Frassinelli
<fraph24(a)gmail.com> wrote:
> Hi all,
> I need to boot a livecd on some hard disk less clients. I tried to use
> livecd-iso-to-pxe, but in my case it unacceptable to load the whole iso
into
> initrd (the iso is not small).
> I made a custom livecd adding dracut-network package, I mounted
> squashfs/root image, exported with nfs, and I've tried to boot the
clients
> with root=nfs:192.168.1.50:/home/frafra/root/ selinux=0, but Fedora
gives me
This tried to use it as normal rootfs, try livenet dracut module,
which handles remote livecd iso:
git.kernel.org/?p=boot/dracut/dracut.git;a=blob;f=modules.d/90livenet/liv...
Very interesting, but I don't like 'wget -O $imgfile "$liveurl"',
because I
would not to load the whole iso.
It should be very easy to add nfs support. It could be added something like:
nfs://*)
nfs="/nfs"
mkdir "$nfs"
mount ${liveurl#nfs://} "$nfs"
imgfile="$nfs"/${imgfile#/run}
;;
...right?
I don't know if it's possible to reuse nfsroot code, in order to do
something cleaner.
Frafra
12:34 p.m.
On 11/20/2011 05:21 PM, Francesco Frassinelli wrote:
Hi all,
I need to boot a livecd on some hard disk less clients. I tried to use
livecd-iso-to-pxe, but in my case it unacceptable to load the whole
iso into initrd (the iso is not small).
I made a custom livecd adding dracut-network package, I mounted
squashfs/root image, exported with nfs, and I've tried to boot the
clients with root=nfs:192.168.1.50:/home/frafra/root/ selinux=0, but
Fedora gives me many errors because it can't write on it.
I found this old thread
http://comments.gmane.org/gmane.linux.redhat.fedora.livecd/4261 but it
doesn't work for me.
Is there a way to get a livecd behaviour with this nfs directory? Or
can I combine the isolinux.cfg livecd options with
root=nfs:192.168.1.50:/home/frafra/ (where it could found the iso or
the mounted iso)?
I'm using dnsmasq with its internal tftp server, which gives vmlinuz0
and initrd0.img (copied from livecd), pxelinux.0 and a configuration
file with the above root=nfs:[...] selinux=0 options.
The real issue is not the size of the iso, but using tftp protocol to
load it.
TFTP needs to ack each segment before the next is sent, thus severely
throttling throughput.
On a 100BT interface, tfpt maxes out at about 2MB/sec.
On a 1000BT interface, tftp maxes out at about 15MB/sec
I would propose using a different method for identifying the initrd to
dracut during the PXE boot process.
Current:
KERNEL /images/centos_server_kvm/vmlinuz0
APPEND rootflags=loop initrd=/images/centos_server_kvm/initrd0.img
root=live:/centos_server_kvm.iso rootfstype=auto ro liveimg quiet rhgb
rd.luks=0 rd.md=0 rd.dm=0
Proposed:
KERNEL /images/centos_server_kvm/vmlinuz0
APPEND rootflags=loop
initrd=http://mymirror.mycompany.com/images/centos_server_kvm/initrd0.img
root=live:/centos_server_kvm.iso
rootfstype=auto ro liveimg quiet rhgb rd.luks=0 rd.md=0 rd.dm=0
That would literally shave minutes off of boot times by increasing
throughput of the large image by a factor of 10 or more.
This is somewhat of a paradox issue, because many of the network and
protocol drivers are within the initrd images. Surely there must be a
way ...
Thanks for listening.
6:03 a.m.
2011/11/21 Phil Meyer <pmeyer(a)themeyerfarm.com>
On 11/20/2011 05:21 PM, Francesco Frassinelli wrote:
> Hi all,
> I need to boot a livecd on some hard disk less clients. I tried to use
> livecd-iso-to-pxe, but in my case it unacceptable to load the whole
> iso into initrd (the iso is not small).
> I made a custom livecd adding dracut-network package, I mounted
> squashfs/root image, exported with nfs, and I've tried to boot the
> clients with root=nfs:192.168.1.50:/home/frafra/root/ selinux=0, but
> Fedora gives me many errors because it can't write on it.
> I found this old thread
> http://comments.gmane.org/gmane.linux.redhat.fedora.livecd/4261 but it
> doesn't work for me.
> Is there a way to get a livecd behaviour with this nfs directory? Or
> can I combine the isolinux.cfg livecd options with
> root=nfs:192.168.1.50:/home/frafra/ (where it could found the iso or
> the mounted iso)?
> I'm using dnsmasq with its internal tftp server, which gives vmlinuz0
> and initrd0.img (copied from livecd), pxelinux.0 and a configuration
> file with the above root=nfs:[...] selinux=0 options.
The real issue is not the size of the iso, but using tftp protocol to
load it.
TFTP needs to ack each segment before the next is sent, thus severely
throttling throughput.
On a 100BT interface, tfpt maxes out at about 2MB/sec.
On a 1000BT interface, tftp maxes out at about 15MB/sec
I would propose using a different method for identifying the initrd to
dracut during the PXE boot process.
Current:
KERNEL /images/centos_server_kvm/vmlinuz0
APPEND rootflags=loop initrd=/images/centos_server_kvm/initrd0.img
root=live:/centos_server_kvm.iso rootfstype=auto ro liveimg quiet rhgb
rd.luks=0 rd.md=0 rd.dm=0
Proposed:
KERNEL /images/centos_server_kvm/vmlinuz0
APPEND rootflags=loop
initrd=http://mymirror.mycompany.com/images/centos_server_kvm/initrd0.img...
rootfstype=auto ro liveimg quiet rhgb rd.luks=0 rd.md=0 rd.dm=0
That would literally shave minutes off of boot times by increasing
throughput of the large image by a factor of 10 or more.
This is somewhat of a paradox issue, because many of the network and
protocol drivers are within the initrd images. Surely there must be a
way ...
I agree with you but keep in mind that loading initrd is a slow process
because it could be big, and it could be big if you load into it the whole
iso. As Alan said before, you could transfer the iso into ram using http(s)
or ftp, so initrd loading is a minor issue.
In my opinion is that if you have a big iso and many clients, it has no
sense to load the whole image, so I would like to adopt a solution where
everything could be fetched only when you need it.
I thought about a possible workaround for this issue: does exist a way to
use a nfsroot as liveimage?
Livecd process mounts iso rootsfs and then writes on ram, so, it could be
easy to get this behaviour with an another root filesystem, right?
Francesco Frassinelli
10:54 a.m.
2011/11/21 Alan Pevec <apevec(a)gmail.com>
On Mon, Nov 21, 2011 at 1:21 AM, Francesco Frassinelli
<fraph24(a)gmail.com> wrote:
> Hi all,
> I need to boot a livecd on some hard disk less clients. I tried to use
> livecd-iso-to-pxe, but in my case it unacceptable to load the whole iso
into
> initrd (the iso is not small).
> I made a custom livecd adding dracut-network package, I mounted
> squashfs/root image, exported with nfs, and I've tried to boot the
clients
> with root=nfs:192.168.1.50:/home/frafra/root/ selinux=0, but Fedora
gives me
This tried to use it as normal rootfs, try livenet dracut module,
which handles remote livecd iso:
git.kernel.org/?p=boot/dracut/dracut.git;a=blob;f=modules.d/90livenet/liv...
Sorry, but do you know how I could use it from boot args?
Also, I found rd.live.dir options. Could be used for this to mount nfs and
then setup the live image?
I try to use:
initrd=initrd0.img root=nfs:192.168.1.50:/home/frafra/iso:nfsvers=3
rootfstype=auto rd.live.dir=/LiveOS ro rd.live.image=1 rd.luks=0 rd.md=0
rd.dm=0 rdshell
...but it doesn't work. I tried to remove /dev/root manually and launch
dmsquash-live-root, and it seems to setup the image correctly, but I don't
know how to start the system and if this method could be automatized.
Thanks,
Francesco Frassinelli
11:03 p.m.
On Tue, 2011-11-22 at 17:54 +0100, Francesco Frassinelli wrote:
2011/11/21 Alan Pevec <apevec(a)gmail.com>
On Mon, Nov 21, 2011 at 1:21 AM, Francesco Frassinelli
<fraph24(a)gmail.com> wrote:
> Hi all,
> I need to boot a livecd on some hard disk less clients. I
tried to use
> livecd-iso-to-pxe, but in my case it unacceptable to load
the whole iso into
> initrd (the iso is not small).
> I made a custom livecd adding dracut-network package, I
mounted
> squashfs/root image, exported with nfs, and I've tried to
boot the clients
> with root=nfs:192.168.1.50:/home/frafra/root/ selinux=0, but
Fedora gives me
This tried to use it as normal rootfs, try livenet dracut
module,
which handles remote livecd iso:
git.kernel.org/?p=boot/dracut/dracut.git;a=blob;f=modules.d/90livenet/liv...
Sorry, but do you know how I could use it from boot args?
Also, I found rd.live.dir options. Could be used for this to mount nfs
and then setup the live image?
I try to use:
initrd=initrd0.img root=nfs:192.168.1.50:/home/frafra/iso:nfsvers=3
rootfstype=auto rd.live.dir=/LiveOS ro rd.live.image=1 rd.luks=0
rd.md=0 rd.dm=0 rdshell
...but it doesn't work. I tried to remove /dev/root manually and
launch dmsquash-live-root, and it seems to setup the image correctly,
but I don't know how to start the system and if this method could be
automatized.
Think your missing a dracut module for that to work have a look at:
http://fedoraproject.org/wiki/Dracut/Options#NFS
Jerry
4:21 a.m.
2011/11/23 Jerry Vonau <jvonau(a)shaw.ca>
On Tue, 2011-11-22 at 17:54 +0100, Francesco Frassinelli wrote:
> 2011/11/21 Alan Pevec <apevec(a)gmail.com>
> On Mon, Nov 21, 2011 at 1:21 AM, Francesco Frassinelli
> <fraph24(a)gmail.com> wrote:
> > Hi all,
> > I need to boot a livecd on some hard disk less clients. I
> tried to use
> > livecd-iso-to-pxe, but in my case it unacceptable to load
> the whole iso into
> > initrd (the iso is not small).
> > I made a custom livecd adding dracut-network package, I
> mounted
> > squashfs/root image, exported with nfs, and I've tried to
> boot the clients
> > with root=nfs:192.168.1.50:/home/frafra/root/ selinux=0, but
> Fedora gives me
>
>
> This tried to use it as normal rootfs, try livenet dracut
> module,
> which handles remote livecd iso:
>
git.kernel.org/?p=boot/dracut/dracut.git;a=blob;f=modules.d/90livenet/liv...
>
>
> Sorry, but do you know how I could use it from boot args?
>
> Also, I found rd.live.dir options. Could be used for this to mount nfs
> and then setup the live image?
> I try to use:
> initrd=initrd0.img root=nfs:192.168.1.50:/home/frafra/iso:nfsvers=3
> rootfstype=auto rd.live.dir=/LiveOS ro rd.live.image=1 rd.luks=0
> rd.md=0 rd.dm=0 rdshell
>
> ...but it doesn't work. I tried to remove /dev/root manually and
> launch dmsquash-live-root, and it seems to setup the image correctly,
> but I don't know how to start the system and if this method could be
> automatized.
Think your missing a dracut module for that to work have a look at:
http://fedoraproject.org/wiki/Dracut/Options#NFS
I've already installed dracut-network: in fact I can mount nfs root.
Yesterday I also found that the default behaviour for Debian live, when you
select "net" binary image, is provide a tftp boot directory with pxelinux
preconfigured for nfs live root. I would like to do the same with Fedora :(
Francesco
4:58 a.m.
On 11/23/2011 11:21 AM, Francesco Frassinelli wrote:
2011/11/23 Jerry Vonau <jvonau(a)shaw.ca
<mailto:jvonau@shaw.ca>>
On Tue, 2011-11-22 at 17:54 +0100, Francesco Frassinelli wrote:
> 2011/11/21 Alan Pevec <apevec(a)gmail.com <mailto:apevec@gmail.com>>
> On Mon, Nov 21, 2011 at 1:21 AM, Francesco Frassinelli
> <fraph24(a)gmail.com <mailto:fraph24@gmail.com>> wrote:
> > Hi all,
> > I need to boot a livecd on some hard disk less clients. I
> tried to use
> > livecd-iso-to-pxe, but in my case it unacceptable to load
> the whole iso into
> > initrd (the iso is not small).
> > I made a custom livecd adding dracut-network package, I
> mounted
> > squashfs/root image, exported with nfs, and I've tried to
> boot the clients
> > with root=nfs:192.168.1.50:/home/frafra/root/ selinux=0, but
> Fedora gives me
>
>
> This tried to use it as normal rootfs, try livenet dracut
> module,
> which handles remote livecd iso:
>
git.kernel.org/?p=boot/dracut/dracut.git;a=blob;f=modules.d/90livenet/liv...
<http://git.kernel.org/?p=boot/dracut/dracut.git;a=blob;f=modules.d/90live...
>
>
> Sorry, but do you know how I could use it from boot args?
>
> Also, I found rd.live.dir options. Could be used for this to mount nfs
> and then setup the live image?
> I try to use:
> initrd=initrd0.img root=nfs:192.168.1.50:/home/frafra/iso:nfsvers=3
> rootfstype=auto rd.live.dir=/LiveOS ro rd.live.image=1 rd.luks=0
> rd.md <http://rd.md>=0 rd.dm <http://rd.dm>=0 rdshell
>
> ...but it doesn't work. I tried to remove /dev/root manually and
> launch dmsquash-live-root, and it seems to setup the image correctly,
> but I don't know how to start the system and if this method could be
> automatized.
Think your missing a dracut module for that to work have a look at:
http://fedoraproject.org/wiki/Dracut/Options#NFS
I've already installed dracut-network: in fact I can mount nfs root.
Yesterday I also found that the default behaviour for Debian live, when you select
"net" binary image, is provide a tftp
boot directory with pxelinux preconfigured for nfs live root. I would like to do the same
with Fedora :(
+1 !
Beside Fedora, I would also like to get it working with CentOS and Scientitifc Linux.
Has anybody on the list some more suggestions?
Thanks,
Urs
4531
days inactive
4533
days old
livecd@lists.fedoraproject.org
8 comments
5 participants
participants (5)
-
Alan Pevec -
Francesco Frassinelli -
Jerry Vonau -
Phil Meyer -
Urs Beyerle