| --- | Log | opened Fri Apr 01 00:00:39 2005 |
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| 09:04 | tessier | Hello all! |
| 09:05 | tessier | Is it necessary to compile a special host kernel to use uml? |
| 09:05 | tessier | btw: www.usermodelinux.org returns no data |
| 09:05 | tessier | ie. it's hosed |
| 09:06 | tessier | I am hoping to get uml running without recompiling the host kernel because this box is 15,000 miles away and if I try to reboot it Murphy is pound me in the yeah. |
| 09:06 | tessier | I have found a guide to getting UML working on FC3 but it is in spanish which isn't ideal but I can read spanish well enough. |
| 09:06 | tessier | Then I realized my host is FC1 but I want to run FC3 in the UML instance. |
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| 09:49 | zigger | you don't necessarily have to recompile the host kernel to run UML. If you want to run UML with SKAS, which will make it much faster, then you'll need to recompile the host. But otherwise you don't have to. |
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| 09:52 | tessier | I see. |
| 09:52 | tessier | How much faster is "much" faster? |
| 09:53 | zigger | I couldn't tell you. I haven't been able to get a linux kernel to successfully take the SKAS patch yet. but I'm still working on it. |
| 09:54 | zigger | I think SKAS also seperates UML from the host in a more secure fashion |
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| 10:00 | tessier | seperate kernel address space, I remember now |
| 10:00 | tessier | I messed with this once a couple years ago. |
| 10:01 | tessier | Reduces the number of pointer derefs for the speed improvement |
| 10:02 | tessier | zigger: Is it possible to use a UML kernel to bootstrap a Fedora install so it will automatically build the root image? |
| 10:05 | zigger | tessier: probably, but you're going to need to have some sort of filesystem for UML to boot off of to start. Have you searched around online to see if anyone's done something similar? |
| 10:05 | tessier | I have LVM on the root fs to install into and the distro iso images I can pass to it. |
| 10:06 | tessier | This seems unlikely due to all of the initrd and hardware detection games etc distros play at startup but I'll give it a shot. |
| 10:07 | zigger | yeah. I haven't played with trying to build my own root_fs yet, but there's gotta be some way to do it. Don't know if it would be the same as installing a distro normally, or if there's any special hoops you need to jump through |
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| 11:07 | | * tessier is quite puzzled by the root_fs situation |
| 11:07 | tessier | It's no better than it was when I played with this a couple of years ago! |
| 11:07 | tessier | There really should be a way to boot and install a root fs from iso images. |
| 11:07 | andyp | that'd be nice |
| 11:08 | tessier | ./linux ubd0=/home/treed/centos/CentOS-4.0-i386-bin1of4.iso |
| 11:08 | tessier | That doesn't do anything. Runs some kernel messages like it's going to boot but then dumps me back at the host os prompt |
| 11:08 | tessier | No errors. |
| 11:09 | tessier | In theory the kernel should boot that as the root fs and run the init stuff on it and start a centos install |
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| 11:09 | andyp | you got a centos image?! |
| 11:09 | tessier | I might have to provide some more options like the native lilo/grub bootloader would.... |
| 11:09 | tessier | Yes, why? |
| 11:10 | tessier | I just rsync'd it from a centos mirror. |
| 11:10 | andyp | hmm |
| 11:10 | andyp | i need to provision one |
| 11:10 | tessier | It is readily available. |
| 11:10 | andyp | please share your wisdom! |
| 11:11 | tessier | www.centos.org |
| 11:11 | tessier | Not much wisdom to it. |
| 11:11 | tessier | But it looks like the uml kernel won't recognize an iso9660 image. :( |
| 11:11 | andyp | oh so i can just download an image from there huh |
| 11:11 | andyp | yeah. didnt think so |
| 11:11 | tessier | yep |
| 11:11 | andyp | riiiiight. |
| 11:12 | andyp | been trying to yum a filesystem |
| 11:12 | andyp | what mirror did you rsync from? |
| 11:12 | tessier | iso9660 support is compiled into the uml kernel... |
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| 11:13 | tessier | rsync -avvz --progress rsync://centos.absinet.net/cAos/centos-4/4.0/isos/i386/ . |
| 11:14 | andyp | wont that download iso's though? |
| 11:14 | andyp | we. dont wan 4.0. isn't that only 64bit support? |
| 11:14 | andyp | oooo. i should try that on my dual opty |
| 11:15 | tessier | http://www.gentoo.org/doc/en/uml.xml |
| 11:15 | tessier | VERY interesting. |
| 11:15 | tessier | Looks like gentoo will bootstrap itself into UML nicely. |
| 11:15 | andyp | yeah gentoo works pretty well with uml |
| 11:16 | andyp | but so does debian |
| 11:18 | andyp | hmm, i COULD just tar up one of my current centos installs |
| 11:22 | andyp | yeah the debian fs runs very nicely |
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| 11:30 | zigger | has anyone here successfully built a host kernel with SKAS support? |
| 11:30 | andyp | yup |
| 11:31 | zigger | I'm using the most current patch from blaisorblade's site (host-skas3-2.6.9-v7.patch), which is supposed to work for any version of the kernel <= 2.6.7 |
| 11:32 | zigger | I just finished trying it on every version of the kernel from 2.6.7 to 2.6.11.6. with most of them the patch doesn't apply properly. with the 2 that actually apply cleanly, building the kernel fails |
| 11:32 | zigger | you didn't have any trouble like this? |
| 11:32 | andyp | hmm. no. but i also was applying a different skas patch |
| 11:32 | andyp | an older one |
| 11:32 | andyp | like almost a year ago :-/ |
| 11:32 | zigger | ahh |
| 11:32 | andyp | sowwy. not much help |
| 11:33 | zigger | I'll poke around and see if I can find an older patch |
| 11:33 | caker | http://www.user-mode-linux.org/~blaisorblade/patches/skas3-2.6/skas-2.6.11-v8-rc5/skas-2.6.11-v8-rc5.patch.bz2 |
| 11:33 | caker | zigger: ^-- use that |
| 11:34 | zigger | will do. thanks |
| 11:35 | tessier | ./linux ubd0=/mnt/images/diskboot.img |
| 11:35 | tessier | ah, I bet that's the trick. But it still doesn't boot. |
| 11:35 | andyp | tessier, or rename .iso to root_fs |
| 11:35 | andyp | some kernels wont let you specify ubd0= |
| 11:35 | andyp | i found that out :-/ |
| 11:37 | tessier | ./linux ubd0=/mnt/images/boot.iso |
| 11:37 | tessier | That attempts to boot and then the kernel oopses |
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| 11:37 | tessier | So I know ubd0= works... |
| 11:37 | andyp | right |
| 11:37 | andyp | hmm |
| 11:37 | andyp | i'd try it man |
| 11:39 | andyp | i gotta goto the datacenter though. i'll bbl |
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| 11:41 | tessier | WTF? Suddenly the behavior has changed. It's not oopsing, it's dumping me back to host os prompt like it did before. |
| 11:44 | tessier | How weird! Every 5th time or so it oopses and the rest of the times it just dumps back out to host os prompt |
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| 13:55 | | * andyp yawns |
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| 15:03 | andyp | dead chan today. heh |
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| --- | Log | closed Sat Apr 02 00:00:08 2005 |
