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seneca
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Joined: 10 Apr 2013
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 Posted: Thu Sep 12, 2013 7:40 am Post subject: [solved]chroot revisited |
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Hello
There are several posts related to chroot issues from 2003, etc, but none applicable to my problem, hence I ask in case others have the same issue
Here is the issue:
1. gentoo in sdc with gnome and KDE, booting off from debian and grub installed on sda (no grub in gentoo or sdc MBR). Gentoo just installed with stage3 method and updated.
2. on the PC all works well
3. did a clonezilla of sda, sdb and sdc for virtualbox and there sda (debian) boots ok but gentoo boots to a logon prompt where the user and root passwords are not recognized. If you chroot gentooś sdc from the liveCD, it chroots ok but then all commands fail with "illegal instruction". While booting, several errors flash quickly on the screen, notably but not limited to udevd fails.
any idea what the heck is going on?
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Lucius Annaeus Seneca
Last edited by seneca on Sat Sep 14, 2013 11:11 pm; edited 1 time in total |
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py-ro
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| Posted: Thu Sep 12, 2013 8:33 am Post subject: |
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Sounds like different, incompatible Architecture.
What CPUs do you use and which CFLAGS? |
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seneca
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| Posted: Thu Sep 12, 2013 10:52 am Post subject: |
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hello py-ro
thanks for taking the time.
the cpu info
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AMD FX(tm)-6200 Six-Core Processor
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the CFLAGS
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CFLAGS="-march=native -O2 -pipe -msse -msse2 -msse3 -mmmx -m3dnow"
CXXFLAGS="${CFLAGS}"
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BTW, as an aside, are the "-mmsse etc" flags needed if march is set to 'native'? I think probably not, but not sure.
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I don't consider myself bald, I'm just taller than my hair.
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py-ro
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| Posted: Thu Sep 12, 2013 10:56 am Post subject: |
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That is your Problem, virtual box won't pass all capabilities of the cpu.
And no, you won't need to specifiy it. |
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seneca
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| Posted: Thu Sep 12, 2013 11:05 am Post subject: |
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excellent for the make.conf (I will delete those flags) but the original issue might be another as I have another gentoo in virtualbox with those flags which works fine, this latter was installed from scratch within virtualbox and is almost identical except 'virtualbox' is included in make.conf for VIDEO_CARDS and INPUT_DEVICES (along with vesa and endev, respectively).
Any other thoughts?
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I don't consider myself bald, I'm just taller than my hair.
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py-ro
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| Posted: Thu Sep 12, 2013 11:18 am Post subject: |
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If the 2nd one was installed inside Virtuabox with native, it will only have the features virtuabox passes through, so it will surely run.
If you use native outside Virtuabox, it will have features enabled not available inside Virtuabox. |
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seneca
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| Posted: Thu Sep 12, 2013 11:28 am Post subject: |
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oh poo
so I guess cloning wont work. k, will forget it and use the virtualbox installed gentoo to test run updates before doing real runs on the hard disk version.
Thanks py-ro
:^)
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I don't consider myself bald, I'm just taller than my hair.
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miket
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Joined: 28 Apr 2007
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Location: Gainesville, FL, USA
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| Posted: Sat Sep 14, 2013 9:19 pm Post subject: |
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| seneca wrote: | oh poo
so I guess cloning wont work. k, will forget it and use the virtualbox installed gentoo to test run updates before doing real runs on the hard disk version.
Thanks py-ro
:^) |
It's possibly not that bad. A kernel with a configuration tuned to run in Virtualbox (or most any other virtualization setup) will almost certainly not run OK on bare metal. The kernel is likely a hangup for you; reconfiguring for the VM environment, plus modification to the configuration files for the virtualized environment (fstab, network interfaces, etc) and any compiling of needed X-window drivers might be enough to get you running. (Are you sure, for example, that the kernel when running in the VM is assuming SCSI-style drive names--sdX--and not something else like hdX?) If you follow py-ro's suggestion of configuring your one kernel to contain the drivers for both environments so that can boot either way, you'll still have that issue about reconfiguring mountpoints and network.
As for the rest of your executables, though, what looks like the native architecture within the VM environment could be similar enough to what is on the real machine for your compiled executables to work. Remember -march=native will get you different things if were running on AMD and your VM wants to emulate Intel.
As for the live-CD, though, it sounds like you had was a mismatch in the word size (32-vs-64 bit) between what you booted from the live-CD and what you've got compiled on your virtualized /dev/sdc.
Actually, if you've got Debian running inside of Virtualbox, unless you've got a word-size mismatch between the Debian and Gentoo installs, why not do your chroot from the booted Debian instead of the live-CD?
Here's a word to the wise about your plans, though: compiling performance is awful inside of a VM. I've used odd setups with compilation in a chroot on the native machine and exports of the resulting file system via NFS so that I could run the result under KVM; this lets me compile full-steam-ahead with all the cores. VM managers only emulate CPU cores using multiple threads which may or may not be bound to the same physical core! Besides that, I/O performance is never as good as native I/O performance. |
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seneca
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| Posted: Sat Sep 14, 2013 11:10 pm Post subject: |
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Hi Miket
Your reply answered many of my doubts. I agree with you 100% about the slow compilations inside the VM, one reason I tried to clone a full setup into the VM rather than installing all from scratch. I will look into the KVM idea for the future as it is helpful for those still learning to test changes in a virtual, things like migrating to systemd, etc., without trashing the PC we use daily
thank you very much for the thoughtful reply
best
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