Re: [Users] Pxeboot

Ok, I think we are on the same page now regarding stateless node. It looks like the achipel diff you just pulled in might be able to do this. But I can't quite make it out what the kernel option should be. Is it "stateless=1"?

David >-----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 >