Re: [Users] Pxeboot

-----Original Message----- From: Mike Burns [mailto:mburns@redhat.com] Sent: Wednesday, February 08, 2012 3:27 PM To: Li, David Cc: Perry Myers; users(a)ovirt.org Subject: Re: [Users] Pxeboot On Wed, 2012-02-08 at 15:19 -0800, Li, David wrote: > Perry, > > I am glad you brought this up. > I 'd be perfectly happy to run the root fs entirely in RAM. In fact that would be ideal for me. It's just I am not quite sure how to use pxeboot to achieve this. > > I am doing a test now using the tftpboot files created from the iso. > As far as I see, the kernel boot options (pxelinux.cfg/default) has: > > root=live:/ovirt-node-image-2.2.2-1.1.fc16.iso > > With this I can only pxeboot to the intall screen. What should I use to let the kernel mount the root fs in memory? Something like root=/dev/ram0? > > David It's not currently possible with ovirt-node. That's the whole stateless feature that we outlined. Once we actually have it implemented, it will be something along the lines of adding "stateless" to the kernel commandline. Mike > > > >-----Original Message----- > >From: Perry Myers [mailto:pmyers@redhat.com] > >Sent: Wednesday, February 08, 2012 2:54 PM > >To: Mike Burns > >Cc: Li, David; users(a)ovirt.org > >Subject: Re: [Users] Pxeboot > > > >On 02/08/2012 05:03 PM, Mike Burns wrote: > >> On Wed, 2012-02-08 at 13:46 -0800, Li, David wrote: > >>> Mike, > >>> > >>> If I understand this correctly, today I should be able to pxeboot > >>> and nfs mount the root fs from a remote server. Apart from > >>> setting up the pxe stuff, I 'd have to populate the ovirt node > >>> root fs on the server > >>> - perhaps steal it from a disk install. In other words I am > >>> concerned about the point from which the kernel starts to execute > >>> /init script (in the initramfs) to the point /init is able to > >>> mount the final root fs from a remote server. > >> > >> No, there is no way to set this up currently in ovirt-node. You > >> could install using a remote iscsi lun if you have a hardware iscsi > >> HBA, but there isn't a way to mount a remote nfs share as the root fs. > >> > >> Supporting a remote NFS share as the root fs isn't even something > >> that requested as an RFE at this point or on the roadmap as far as > >> I'm aware. > >> > >> It sounds like what you're really looking for is a shared root fs > >> that multiple hosts could use. This is something that we will > >> probably look into eventually, but it's not on the immediate roadmap. > > > >Given that the rootfs of oVirt Node is fairly small and in a truly > >stateless environment would just run out of system RAM, there's no > >real reason to try to do a shared NFS based rootfs. It's an > >unnecessary complication I think, if the end goal is to move to truly stateless. > > > >For larger systems where the rootfs is on the order of GB's, shared > >root may make more sense. > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users